在前面的文章我们已经介绍了如何自己去实现一个BootLoader，今天我们来介绍u-boot的移植，u-boot是一种通用的BootLoader。
在嵌入式Linux之uboot源码make配置编译正向分析中我们已经介绍了如何通过Source Insight打开u-boot源码，以及uboot的编译过程。这一节我们将对u-boot源码进行分析，并且将uboot移植到Mini2440开发板。
在移植之前，我们首先需要明确Mini2440开发板具有的硬件资源：
- SoC：S3C2440；
- NAND：K9F2G08U0C；
- 网卡：DM9000A；
- SDRAM：HY57V561620FTP；
从网站上下载得到u-boot源码包，例如：u-boot-2016.05.tar.bz2 （最新的u-boot版本已经不支持s3c2440）。
一、uboot编译
在之前的文章中我们介绍过smdk2410的编译过程，这里再啰嗦一遍，uboot的编译分为两步：配置、编译:
1.1 配置
配置选择所要使用的board ，我调试使用的是S3C2440,但是./configs目录下没有smdk2440_defconfig这个文件，只有smdk2410_defconfig，因此执行如下命令，生成.config文件：
make smdk2410_defconfig
.config文件定义如下：
# # Automatically generated file; DO NOT EDIT. # U-Boot 2016.05 Configuration # CONFIG_CREATE_ARCH_SYMLINK=y CONFIG_HAVE_GENERIC_BOARD=y CONFIG_SYS_GENERIC_BOARD=y # CONFIG_ARC is not set CONFIG_ARM=y # CONFIG_AVR32 is not set # CONFIG_BLACKFIN is not set # CONFIG_M68K is not set # CONFIG_MICROBLAZE is not set # CONFIG_MIPS is not set # CONFIG_NDS32 is not set # CONFIG_NIOS2 is not set # CONFIG_OPENRISC is not set # CONFIG_PPC is not set # CONFIG_SANDBOX is not set # CONFIG_SH is not set # CONFIG_SPARC is not set # CONFIG_X86 is not set CONFIG_SYS_ARCH="arm" CONFIG_SYS_CPU="arm920t" CONFIG_SYS_SOC="s3c24x0" CONFIG_SYS_VENDOR="samsung" CONFIG_SYS_BOARD="smdk2410" CONFIG_SYS_CONFIG_NAME="smdk2410" # # ARM architecture # CONFIG_CPU_ARM920T=y # CONFIG_SEMIHOSTING is not set # CONFIG_SYS_L2CACHE_OFF is not set # CONFIG_ARCH_AT91 is not set # CONFIG_TARGET_EDB93XX is not set # CONFIG_TARGET_VCMA9 is not set CONFIG_TARGET_SMDK2410=y # CONFIG_TARGET_ASPENITE is not set # CONFIG_TARGET_GPLUGD is not set # CONFIG_ARCH_DAVINCI is not set # CONFIG_KIRKWOOD is not set # CONFIG_ARCH_MVEBU is not set # CONFIG_TARGET_DEVKIT3250 is not set # CONFIG_TARGET_WORK_92105 is not set # CONFIG_TARGET_MX25PDK is not set # CONFIG_TARGET_ZMX25 is not set # CONFIG_TARGET_APF27 is not set # CONFIG_TARGET_APX4DEVKIT is not set # CONFIG_TARGET_XFI3 is not set # CONFIG_TARGET_M28EVK is not set # CONFIG_TARGET_MX23EVK is not set # CONFIG_TARGET_MX28EVK is not set # CONFIG_TARGET_MX23_OLINUXINO is not set # CONFIG_TARGET_BG0900 is not set # CONFIG_TARGET_SANSA_FUZE_PLUS is not set # CONFIG_TARGET_SC_SPS_1 is not set # CONFIG_ORION5X is not set # CONFIG_TARGET_SPEAR300 is not set # CONFIG_TARGET_SPEAR310 is not set # CONFIG_TARGET_SPEAR320 is not set # CONFIG_TARGET_SPEAR600 is not set # CONFIG_TARGET_STV0991 is not set # CONFIG_TARGET_X600 is not set # CONFIG_TARGET_IMX31_PHYCORE is not set # CONFIG_TARGET_MX31ADS is not set # CONFIG_TARGET_MX31PDK is not set # CONFIG_TARGET_WOODBURN is not set # CONFIG_TARGET_WOODBURN_SD is not set # CONFIG_TARGET_FLEA3 is not set # CONFIG_TARGET_MX35PDK is not set # CONFIG_ARCH_BCM283X is not set # CONFIG_TARGET_VEXPRESS_CA15_TC2 is not set # CONFIG_TARGET_VEXPRESS_CA5X2 is not set # CONFIG_TARGET_VEXPRESS_CA9X4 is not set # CONFIG_TARGET_KWB is not set # CONFIG_TARGET_TSERIES is not set # CONFIG_TARGET_CM_T335 is not set # CONFIG_TARGET_PEPPER is not set # CONFIG_TARGET_AM335X_IGEP0033 is not set # CONFIG_TARGET_PCM051 is not set # CONFIG_TARGET_DRACO is not set # CONFIG_TARGET_THUBAN is not set # CONFIG_TARGET_RASTABAN is not set # CONFIG_TARGET_PXM2 is not set # CONFIG_TARGET_RUT is not set # CONFIG_TARGET_PENGWYN is not set # CONFIG_TARGET_AM335X_BALTOS is not set # CONFIG_TARGET_AM335X_EVM is not set # CONFIG_TARGET_AM335X_SL50 is not set # CONFIG_TARGET_AM43XX_EVM is not set # CONFIG_TARGET_BAV335X is not set # CONFIG_TARGET_TI814X_EVM is not set # CONFIG_TARGET_TI816X_EVM is not set # CONFIG_TARGET_BCM28155_AP is not set # CONFIG_TARGET_BCMCYGNUS is not set # CONFIG_TARGET_BCMNSP is not set # CONFIG_ARCH_EXYNOS is not set # CONFIG_ARCH_S5PC1XX is not set # CONFIG_ARCH_HIGHBANK is not set # CONFIG_ARCH_INTEGRATOR is not set # CONFIG_ARCH_KEYSTONE is not set # CONFIG_ARCH_MX7 is not set # CONFIG_ARCH_MX6 is not set # CONFIG_ARCH_MX5 is not set # CONFIG_TARGET_M53EVK is not set # CONFIG_TARGET_MX51EVK is not set # CONFIG_TARGET_MX53ARD is not set # CONFIG_TARGET_MX53EVK is not set # CONFIG_TARGET_MX53LOCO is not set # CONFIG_TARGET_MX53SMD is not set # CONFIG_OMAP34XX is not set # CONFIG_OMAP44XX is not set # CONFIG_OMAP54XX is not set # CONFIG_RMOBILE is not set # CONFIG_ARCH_SNAPDRAGON is not set # CONFIG_ARCH_SOCFPGA is not set # CONFIG_TARGET_CM_T43 is not set # CONFIG_ARCH_SUNXI is not set # CONFIG_TARGET_TS4800 is not set # CONFIG_TARGET_VF610TWR is not set # CONFIG_TARGET_COLIBRI_VF is not set # CONFIG_TARGET_PCM052 is not set # CONFIG_ARCH_ZYNQ is not set # CONFIG_ARCH_ZYNQMP is not set # CONFIG_TEGRA is not set # CONFIG_TARGET_VEXPRESS64_AEMV8A is not set # CONFIG_TARGET_VEXPRESS64_BASE_FVP is not set # CONFIG_TARGET_VEXPRESS64_BASE_FVP_DRAM is not set # CONFIG_TARGET_VEXPRESS64_JUNO is not set # CONFIG_TARGET_LS2080A_EMU is not set # CONFIG_TARGET_LS2080A_SIMU is not set # CONFIG_TARGET_LS2080AQDS is not set # CONFIG_TARGET_LS2080ARDB is not set # CONFIG_TARGET_HIKEY is not set # CONFIG_TARGET_LS1021AQDS is not set # CONFIG_TARGET_LS1021ATWR is not set # CONFIG_TARGET_LS1043AQDS is not set # CONFIG_TARGET_LS1043ARDB is not set # CONFIG_TARGET_H2200 is not set # CONFIG_TARGET_ZIPITZ2 is not set # CONFIG_TARGET_COLIBRI_PXA270 is not set # CONFIG_ARCH_UNIPHIER is not set # CONFIG_STM32 is not set # CONFIG_ARCH_ROCKCHIP is not set # CONFIG_TARGET_THUNDERX_88XX is not set # CONFIG_SYS_MALLOC_F is not set # # ARM debug # # CONFIG_DEBUG_LL is not set # # General setup # CONFIG_LOCALVERSION="" CONFIG_LOCALVERSION_AUTO=y CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_EXPERT=y CONFIG_SYS_MALLOC_CLEAR_ON_INIT=y # # Boot images # # CONFIG_FIT is not set CONFIG_SYS_EXTRA_OPTIONS="" # # Boot timing # # CONFIG_BOOTSTAGE is not set CONFIG_BOOTSTAGE_USER_COUNT=20 CONFIG_BOOTSTAGE_STASH_ADDR=0 CONFIG_BOOTSTAGE_STASH_SIZE=4096 # CONFIG_CONSOLE_RECORD is not set # # Command line interface # CONFIG_CMDLINE=y CONFIG_HUSH_PARSER=y CONFIG_SYS_HUSH_PARSER=y CONFIG_SYS_PROMPT="SMDK2410 # " # # Autoboot options # # CONFIG_AUTOBOOT_KEYED is not set # # Commands # # # Info commands # CONFIG_CMD_BDI=y CONFIG_CMD_CONSOLE=y # CONFIG_CMD_CPU is not set # CONFIG_CMD_LICENSE is not set # # Boot commands # CONFIG_CMD_BOOTD=y CONFIG_CMD_BOOTM=y # CONFIG_CMD_BOOTZ is not set CONFIG_CMD_ELF=y CONFIG_CMD_GO=y CONFIG_CMD_RUN=y CONFIG_CMD_IMI=y CONFIG_CMD_IMLS=y CONFIG_CMD_XIMG=y # # Environment commands # # CONFIG_CMD_ASKENV is not set CONFIG_CMD_EXPORTENV=y CONFIG_CMD_IMPORTENV=y CONFIG_CMD_EDITENV=y # CONFIG_CMD_GREPENV is not set CONFIG_CMD_SAVEENV=y CONFIG_CMD_ENV_EXISTS=y # # Memory commands # CONFIG_CMD_MEMORY=y CONFIG_CMD_CRC32=y # CONFIG_LOOPW is not set # CONFIG_CMD_MEMTEST is not set # CONFIG_CMD_MX_CYCLIC is not set # CONFIG_CMD_MEMINFO is not set # # Device access commands # CONFIG_CMD_LOADB=y CONFIG_CMD_LOADS=y CONFIG_CMD_FLASH=y # CONFIG_CMD_ARMFLASH is not set # CONFIG_CMD_MMC is not set # CONFIG_CMD_NAND is not set # CONFIG_CMD_SF is not set # CONFIG_CMD_SPI is not set # CONFIG_CMD_I2C is not set CONFIG_CMD_USB=y # CONFIG_CMD_DFU is not set # CONFIG_CMD_USB_MASS_STORAGE is not set CONFIG_CMD_FPGA=y # CONFIG_CMD_GPIO is not set # # Shell scripting commands # CONFIG_CMD_ECHO=y CONFIG_CMD_ITEST=y CONFIG_CMD_SOURCE=y # CONFIG_CMD_SETEXPR is not set # # Network commands # CONFIG_CMD_NET=y # CONFIG_CMD_TFTPPUT is not set # CONFIG_CMD_TFTPSRV is not set # CONFIG_CMD_RARP is not set CONFIG_CMD_DHCP=y CONFIG_CMD_NFS=y # CONFIG_CMD_MII is not set CONFIG_CMD_PING=y # CONFIG_CMD_CDP is not set # CONFIG_CMD_SNTP is not set # CONFIG_CMD_DNS is not set # CONFIG_CMD_LINK_LOCAL is not set # # Misc commands # CONFIG_CMD_CACHE=y # CONFIG_CMD_TIME is not set CONFIG_CMD_MISC=y # CONFIG_CMD_TIMER is not set # # Power commands # # # Security commands # # # Filesystem commands # CONFIG_CMD_EXT2=y # CONFIG_CMD_EXT4 is not set CONFIG_CMD_FAT=y # CONFIG_CMD_FS_GENERIC is not set CONFIG_SUPPORT_OF_CONTROL=y # # Device Tree Control # # CONFIG_OF_CONTROL is not set CONFIG_NET=y # CONFIG_NET_RANDOM_ETHADDR is not set # CONFIG_NETCONSOLE is not set CONFIG_NET_TFTP_VARS=y # # Device Drivers # # # Generic Driver Options # # CONFIG_DM is not set # CONFIG_ADC is not set # CONFIG_ADC_EXYNOS is not set # CONFIG_ADC_SANDBOX is not set # CONFIG_BLOCK_CACHE is not set # # Clock # # CONFIG_CPU is not set # # Hardware crypto devices # # CONFIG_FSL_CAAM is not set # # Demo for driver model # # # DFU support # # CONFIG_DFU_TFTP is not set # # DMA Support # # CONFIG_TI_EDMA3 is not set # # GPIO Support # # # I2C support # # CONFIG_CROS_EC_KEYB is not set # # LED Support # # # Memory Controller drivers # # # Multifunction device drivers # # CONFIG_CROS_EC is not set # CONFIG_FSL_SEC_MON is not set # CONFIG_MXC_OCOTP is not set # CONFIG_PCA9551_LED is not set # CONFIG_WINBOND_W83627 is not set # # MMC Host controller Support # # # MTD Support # # # NAND Device Support # # CONFIG_NAND_DENALI is not set # CONFIG_NAND_VF610_NFC is not set # CONFIG_NAND_PXA3XX is not set # CONFIG_NAND_ARASAN is not set # # Generic NAND options # # # SPI Flash Support # # CONFIG_SPI_FLASH is not set # CONFIG_PHYLIB is not set # CONFIG_NETDEVICES is not set # # PCI # # # Pin controllers # # # Power # # # Remote Processor drivers # # # Real Time Clock # # # Serial drivers # # CONFIG_DEBUG_UART is not set # CONFIG_DEBUG_UART_SKIP_INIT is not set # CONFIG_FSL_LPUART is not set # CONFIG_SYS_NS16550 is not set # # Sound support # # CONFIG_SOUND is not set # # SPI Support # # CONFIG_FSL_ESPI is not set # CONFIG_TI_QSPI is not set # # SPMI support # # CONFIG_DM_THERMAL is not set # # Timer Support # # # TPM support # # CONFIG_USB is not set # # Graphics support # # # TrueType Fonts # # CONFIG_VIDEO_VESA is not set # CONFIG_VIDEO_LCD_ANX9804 is not set # CONFIG_VIDEO_LCD_SSD2828 is not set # CONFIG_VIDEO_MVEBU is not set # CONFIG_PHYS_TO_BUS is not set # # File systems # # # Library routines # # CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED is not set CONFIG_HAVE_PRIVATE_LIBGCC=y # CONFIG_USE_PRIVATE_LIBGCC is not set CONFIG_SYS_HZ=1000 # CONFIG_USE_TINY_PRINTF is not set CONFIG_REGEX=y # CONFIG_LIB_RAND is not set # CONFIG_CMD_DHRYSTONE is not set # CONFIG_RSA is not set # # Hashing Support # # CONFIG_SHA1 is not set # CONFIG_SHA256 is not set # CONFIG_SHA_HW_ACCEL is not set # # Compression Support # # CONFIG_LZ4 is not set # CONFIG_ERRNO_STR is not set # CONFIG_OF_LIBFDT is not set # CONFIG_SPL_OF_LIBFDT is not set # CONFIG_UNIT_TEST is not set
这个文件和include/config/auto.conf文件内容大致差不多(auto.cfg是由.config生成的)：
# # Automatically generated file; DO NOT EDIT. # U-Boot 2016.05 Configuration # CONFIG_CMD_BOOTM=y CONFIG_CMD_USB=y CONFIG_CMD_EDITENV=y CONFIG_SYS_GENERIC_BOARD=y CONFIG_CMD_CONSOLE=y CONFIG_CMD_BOOTD=y CONFIG_CMD_IMLS=y CONFIG_BOOTSTAGE_STASH_ADDR=0 CONFIG_HAVE_PRIVATE_LIBGCC=y CONFIG_CMD_BDI=y CONFIG_ARM=y CONFIG_CREATE_ARCH_SYMLINK=y CONFIG_SYS_VENDOR="samsung" CONFIG_CMD_PING=y CONFIG_CMD_SAVEENV=y CONFIG_CMD_MISC=y CONFIG_SYS_CPU="arm920t" CONFIG_BOOTSTAGE_USER_COUNT=20 CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_CMD_FLASH=y CONFIG_REGEX=y CONFIG_CMD_ENV_EXISTS=y CONFIG_HAVE_GENERIC_BOARD=y CONFIG_CMD_EXPORTENV=y CONFIG_CMD_DHCP=y CONFIG_SYS_EXTRA_OPTIONS="" CONFIG_CMD_CRC32=y CONFIG_SYS_BOARD="smdk2410" CONFIG_SYS_CONFIG_NAME="smdk2410" CONFIG_CMD_NFS=y CONFIG_NET=y CONFIG_TARGET_SMDK2410=y CONFIG_CMD_GO=y CONFIG_SYS_MALLOC_CLEAR_ON_INIT=y CONFIG_CMD_IMI=y CONFIG_SYS_HZ=1000 CONFIG_SUPPORT_OF_CONTROL=y CONFIG_CMD_EXT2=y CONFIG_LOCALVERSION="" CONFIG_CMDLINE=y CONFIG_CMD_LOADB=y CONFIG_CMD_RUN=y CONFIG_SYS_HUSH_PARSER=y CONFIG_SYS_PROMPT="SMDK2410 # " CONFIG_CMD_MEMORY=y CONFIG_HUSH_PARSER=y CONFIG_CMD_XIMG=y CONFIG_CMD_ECHO=y CONFIG_LOCALVERSION_AUTO=y CONFIG_SYS_ARCH="arm" CONFIG_EXPERT=y CONFIG_SYS_SOC="s3c24x0" CONFIG_CMD_ITEST=y CONFIG_CMD_CACHE=y CONFIG_BOOTSTAGE_STASH_SIZE=4096 CONFIG_CMD_LOADS=y CONFIG_CMD_FAT=y CONFIG_CMD_NET=y CONFIG_CMD_FPGA=y CONFIG_NET_TFTP_VARS=y CONFIG_CPU_ARM920T=y CONFIG_CMD_IMPORTENV=y CONFIG_CMD_ELF=y CONFIG_CMD_SOURCE=y
include/config/auto.conf是由fixdep在编译时生成的依赖文件。在顶层Makefile会引入auto.conf文件：
ifeq ($(dot-config),1) # Read in config -include include/config/auto.conf
这样在执行make编译过程中，就可以根据include/config/auto.conf中的宏的定义编译不同的库文件，例如common/Makefile定义：
ifndef CONFIG_SPL_BUILD obj-y += init/ obj-y += main.o obj-y += exports.o obj-y += hash.o ifdef CONFIG_SYS_HUSH_PARSER obj-y += cli_hush.o endif
此外，还有一个文件include/generated/autoconf.h会在执行make编译类似built-in.o目标文件时引入，这个文件是在u-boot配置生成.config文件过程中生成的，和include/config/auto.conf定义的是一样的：
/* * * Automatically generated file; DO NOT EDIT. * U-Boot 2016.05 Configuration * */ #define CONFIG_CMD_BOOTM 1 #define CONFIG_CMD_USB 1 #define CONFIG_CMD_EDITENV 1 #define CONFIG_SYS_GENERIC_BOARD 1 #define CONFIG_CMD_CONSOLE 1 #define CONFIG_CMD_BOOTD 1 #define CONFIG_CMD_IMLS 1 #define CONFIG_BOOTSTAGE_STASH_ADDR 0x0 #define CONFIG_HAVE_PRIVATE_LIBGCC 1 #define CONFIG_CMD_BDI 1 #define CONFIG_ARM 1 #define CONFIG_CREATE_ARCH_SYMLINK 1 #define CONFIG_SYS_VENDOR "samsung" #define CONFIG_CMD_PING 1 #define CONFIG_CMD_SAVEENV 1 #define CONFIG_CMD_MISC 1 #define CONFIG_SYS_CPU "arm920t" #define CONFIG_BOOTSTAGE_USER_COUNT 0x20 #define CONFIG_CC_OPTIMIZE_FOR_SIZE 1 #define CONFIG_CMD_FLASH 1 #define CONFIG_REGEX 1 #define CONFIG_CMD_ENV_EXISTS 1 #define CONFIG_HAVE_GENERIC_BOARD 1 #define CONFIG_CMD_EXPORTENV 1 #define CONFIG_CMD_DHCP 1 #define CONFIG_SYS_EXTRA_OPTIONS "" #define CONFIG_CMD_CRC32 1 #define CONFIG_SYS_BOARD "smdk2410" #define CONFIG_SYS_CONFIG_NAME "smdk2410" #define CONFIG_CMD_NFS 1 #define CONFIG_NET 1 #define CONFIG_TARGET_SMDK2410 1 #define CONFIG_CMD_GO 1 #define CONFIG_SYS_MALLOC_CLEAR_ON_INIT 1 #define CONFIG_CMD_IMI 1 #define CONFIG_SYS_HZ 1000 #define CONFIG_SUPPORT_OF_CONTROL 1 #define CONFIG_CMD_EXT2 1 #define CONFIG_LOCALVERSION "" #define CONFIG_CMDLINE 1 #define CONFIG_CMD_LOADB 1 #define CONFIG_CMD_RUN 1 #define CONFIG_SYS_HUSH_PARSER 1 #define CONFIG_SYS_PROMPT "SMDK2410 # " #define CONFIG_CMD_MEMORY 1 #define CONFIG_HUSH_PARSER 1 #define CONFIG_CMD_XIMG 1 #define CONFIG_CMD_ECHO 1 #define CONFIG_LOCALVERSION_AUTO 1 #define CONFIG_SYS_ARCH "arm" #define CONFIG_EXPERT 1 #define CONFIG_SYS_SOC "s3c24x0" #define CONFIG_CMD_ITEST 1 #define CONFIG_CMD_CACHE 1 #define CONFIG_BOOTSTAGE_STASH_SIZE 0x4096 #define CONFIG_CMD_LOADS 1 #define CONFIG_CMD_FAT 1 #define CONFIG_CMD_NET 1 #define CONFIG_CMD_FPGA 1 #define CONFIG_NET_TFTP_VARS 1 #define CONFIG_CPU_ARM920T 1 #define CONFIG_CMD_IMPORTENV 1 #define CONFIG_CMD_ELF 1 #define CONFIG_CMD_SOURCE 1
总结一下include/config/auto.conf和include/generated/autoconf.h的区别，前者是定义的变量在Makefile文件中使用，后者定义的宏在代码中使用。
1.2 编译
编译、执行make命令，生成u-boot:
make ARCH=arm CROSS_COMPILE=arm-linux-
如果需要输出u-boot反汇编代码，执行时加入-j4参数，会在u-boot根目录下生成u-boot.map文件，在map文件中，包含函数名以及函数所在文件。
make ARCH=arm CROSS_COMPILE=arm-linux- -j4
直接反汇编u-boot文件，可以得到反汇编代码：
arm-linux-objdump -D u-boot > u-boot.dis
CROSS-COPILE是在Makefile文件中定义的变量，是用来指定交叉工具链，ARCH用来指定处理器架构。此外，我们可以在u-boot的顶层Makefile中定义：
CROSS_COMPILE=arm-linux- ARCH=arm
这样就省去了每次编译都要在控制台输入的麻烦。
编译成功后会生成一个u-boot.bin,可以烧写到开发板上,不过一般是用不起来的,需要进一步修改。
我们在编译u-boot的时候加入V=1参数：
make ARCH=arm CROSS_COMPILE=arm-linux- V=1
将会输出u-boot编译的完整步骤：
make -f ./Makefile silentoldconfig make -f ./scripts/Makefile.build obj=scripts/basic rm -f .tmp_quiet_recordmcount make -f ./scripts/Makefile.build obj=scripts/kconfig silentoldconfig mkdir -p include/config include/generated scripts/kconfig/conf --silentoldconfig Kconfig make -f ./scripts/Makefile.autoconf || { rm -f include/config/auto.conf; false; } if [ -d arch/arm/mach-s3c24x0/include/mach ]; then dest=../../mach-s3c24x0/include/mach; else dest=arch-s3c24x0; fi; ln -fsn $dest arch/arm/include/asm/arch set -e; : ' CHK include/config.h'; mkdir -p include/; (echo "/* Automatically generated - do not edit */"; for i in $(echo "" | sed 's/,/ /g'); do echo #define CONFIG_$i | sed '/=/ {s/=/ /;q; } ; { s/$/ 1/; }'; done; echo #define CONFIG_BOARDDIR board/samsung/smdk2410; echo #include <config_defaults.h>; echo #include <config_uncmd_spl.h>; echo #include <configs/"smdk2410".h>; echo #include <asm/config.h>; echo #include <config_fallbacks.h>;) < scripts/Makefile.autoconf > include/config.h.tmp; if [ -r include/config.h ] && cmp -s include/config.h include/config.h.tmp; then rm -f include/config.h.tmp; else : ' UPD include/config.h'; mv -f include/config.h.tmp include/config.h; fi arm-linux-gcc -E -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__KERNEL__ -D__UBOOT__ -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -DDO_DEPS_ONLY -dM ./include/common.h > include/autoconf.mk.tmp && { sed -n -f ./tools/scripts/define2mk.sed include/autoconf.mk.tmp | while read line; do if [ -n "" ] || ! grep -q "${line%=*}=" include/config/auto.conf; then echo "$line"; fi done > include/autoconf.mk; rm include/autoconf.mk.tmp; } || { rm include/autoconf.mk.tmp; false; } arm-linux-gcc -x c -DDO_DEPS_ONLY -M -MP -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__KERNEL__ -D__UBOOT__ -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -MQ include/config/auto.conf ./include/common.h > include/autoconf.mk.dep || { rm include/autoconf.mk.dep; false; } touch include/config/auto.conf set -e; : ' CHK include/config/uboot.release'; mkdir -p include/config/; echo "2016.05$(/bin/bash ./scripts/setlocalversion .)" < include/config/auto.conf > include/config/uboot.release.tmp; if [ -r include/config/uboot.release ] && cmp -s include/config/uboot.release include/config/uboot.release.tmp; then rm -f include/config/uboot.release.tmp; else : ' UPD include/config/uboot.release'; mv -f include/config/uboot.release.tmp include/config/uboot.release; fi set -e; : ' CHK include/generated/version_autogenerated.h'; mkdir -p include/generated/; (echo #define PLAIN_VERSION "2016.05"; echo #define U_BOOT_VERSION "U-Boot " PLAIN_VERSION; echo #define CC_VERSION_STRING "$(arm-linux-gcc --version | head -n 1)"; echo #define LD_VERSION_STRING "$(arm-linux-ld --version | head -n 1)"; ) < include/config/uboot.release > include/generated/version_autogenerated.h.tmp; if [ -r include/generated/version_autogenerated.h ] && cmp -s include/generated/version_autogenerated.h include/generated/version_autogenerated.h.tmp; then rm -f include/generated/version_autogenerated.h.tmp; else : ' UPD include/generated/version_autogenerated.h'; mv -f include/generated/version_autogenerated.h.tmp include/generated/version_autogenerated.h; fi set -e; : ' CHK include/generated/timestamp_autogenerated.h'; mkdir -p include/generated/; (if test -n "${SOURCE_DATE_EPOCH}"; then SOURCE_DATE="@${SOURCE_DATE_EPOCH}"; DATE=""; for date in gdate date.gnu date; do ${date} -u -d "${SOURCE_DATE}" >/dev/null 2>&1 && DATE="${date}"; done; if test -n "${DATE}"; then LC_ALL=C ${DATE} -u -d "${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; LC_ALL=C ${DATE} -u -d "${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; LC_ALL=C ${DATE} -u -d "${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; LC_ALL=C ${DATE} -u -d "${SOURCE_DATE}" +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; else return 42; fi; else LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; LC_ALL=C date +'#define U_BOOT_TIME "%T"'; LC_ALL=C date +'#define U_BOOT_TZ "%z"'; LC_ALL=C date +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; fi) < Makefile > include/generated/timestamp_autogenerated.h.tmp; if [ -r include/generated/timestamp_autogenerated.h ] && cmp -s include/generated/timestamp_autogenerated.h include/generated/timestamp_autogenerated.h.tmp; then rm -f include/generated/timestamp_autogenerated.h.tmp; else : ' UPD include/generated/timestamp_autogenerated.h'; mv -f include/generated/timestamp_autogenerated.h.tmp include/generated/timestamp_autogenerated.h; fi make -f ./scripts/Makefile.build obj=scripts/basic rm -f .tmp_quiet_recordmcount make -f ./scripts/Makefile.build obj=. mkdir -p lib/ set -e; : ' CHK include/generated/generic-asm-offsets.h'; mkdir -p include/generated/; (set -e; echo "#ifndef __GENERIC_ASM_OFFSETS_H__"; echo "#define __GENERIC_ASM_OFFSETS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne "s:[[:space:]]*.ascii[[:space:]]*"(.*)":1:; /^->/{s:->#(.*):/* 1 */:; s:^->([^ ]*) [$#]*([-0-9]*) (.*):#define 1 2 /* 3 */:; s:^->([^ ]*) [$#]*([^ ]*) (.*):#define 1 2 /* 3 */:; s:->::; p;}"; echo ""; echo "#endif" ) < lib/asm-offsets.s > include/generated/generic-asm-offsets.h.tmp; if [ -r include/generated/generic-asm-offsets.h ] && cmp -s include/generated/generic-asm-offsets.h include/generated/generic-asm-offsets.h.tmp; then rm -f include/generated/generic-asm-offsets.h.tmp; else : ' UPD include/generated/generic-asm-offsets.h'; mv -f include/generated/generic-asm-offsets.h.tmp include/generated/generic-asm-offsets.h; fi mkdir -p arch/arm/lib/ set -e; : ' CHK include/generated/asm-offsets.h'; mkdir -p include/generated/; (set -e; echo "#ifndef __ASM_OFFSETS_H__"; echo "#define __ASM_OFFSETS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne "s:[[:space:]]*.ascii[[:space:]]*"(.*)":1:; /^->/{s:->#(.*):/* 1 */:; s:^->([^ ]*) [$#]*([-0-9]*) (.*):#define 1 2 /* 3 */:; s:^->([^ ]*) [$#]*([^ ]*) (.*):#define 1 2 /* 3 */:; s:->::; p;}"; echo ""; echo "#endif" ) < arch/arm/lib/asm-offsets.s > include/generated/asm-offsets.h.tmp; if [ -r include/generated/asm-offsets.h ] && cmp -s include/generated/asm-offsets.h include/generated/asm-offsets.h.tmp; then rm -f include/generated/asm-offsets.h.tmp; else : ' UPD include/generated/asm-offsets.h'; mv -f include/generated/asm-offsets.h.tmp include/generated/asm-offsets.h; fi make -f ./scripts/Makefile.build obj=tools echo "#include <../lib/crc32.c>" >tools/lib/crc32.c cc -Wp,-MD,tools/lib/.crc32.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -c -o tools/lib/crc32.o tools/lib/crc32.c echo "#include <../common/env_embedded.c>" >tools/common/env_embedded.c cc -Wp,-MD,tools/common/.env_embedded.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/common/env_embedded.o tools/common/env_embedded.c echo "#include <../lib/sha1.c>" >tools/lib/sha1.c cc -Wp,-MD,tools/lib/.sha1.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -c -o tools/lib/sha1.o tools/lib/sha1.c cc -o tools/envcrc tools/envcrc.o tools/lib/crc32.o tools/common/env_embedded.o tools/lib/sha1.o cc -Wp,-MD,tools/.gen_eth_addr.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -o tools/gen_eth_addr tools/gen_eth_addr.c cc -Wp,-MD,tools/.img2srec.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -o tools/img2srec tools/img2srec.c cc -Wp,-MD,tools/.mkenvimage.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/mkenvimage.o tools/mkenvimage.c cc -o tools/mkenvimage tools/mkenvimage.o tools/os_support.o tools/lib/crc32.o echo "#include <../common/bootm.c>" >tools/common/bootm.c cc -Wp,-MD,tools/common/.bootm.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/common/bootm.o tools/common/bootm.c echo "#include <../lib/fdtdec_common.c>" >tools/lib/fdtdec_common.c cc -Wp,-MD,tools/lib/.fdtdec_common.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/fdtdec_common.o tools/lib/fdtdec_common.c echo "#include <../lib/fdtdec.c>" >tools/lib/fdtdec.c cc -Wp,-MD,tools/lib/.fdtdec.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/fdtdec.o tools/lib/fdtdec.c cc -Wp,-MD,tools/.fit_image.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/fit_image.o tools/fit_image.c echo "#include <../common/image-fit.c>" >tools/common/image-fit.c cc -Wp,-MD,tools/common/.image-fit.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/common/image-fit.o tools/common/image-fit.c cc -Wp,-MD,tools/.image-host.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/image-host.o tools/image-host.c echo "#include <../common/image.c>" >tools/common/image.c cc -Wp,-MD,tools/common/.image.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/common/image.o tools/common/image.c echo "#include <../lib/md5.c>" >tools/lib/md5.c cc -Wp,-MD,tools/lib/.md5.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -c -o tools/lib/md5.o tools/lib/md5.c echo "#include <../lib/rc4.c>" >tools/lib/rc4.c cc -Wp,-MD,tools/lib/.rc4.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/rc4.o tools/lib/rc4.c echo "#include <../lib/sha256.c>" >tools/lib/sha256.c cc -Wp,-MD,tools/lib/.sha256.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -pedantic -c -o tools/lib/sha256.o tools/lib/sha256.c echo "#include <../common/hash.c>" >tools/common/hash.c cc -Wp,-MD,tools/common/.hash.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/common/hash.o tools/common/hash.c echo "#include <../lib/libfdt/fdt.c>" >tools/lib/libfdt/fdt.c cc -Wp,-MD,tools/lib/libfdt/.fdt.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt.o tools/lib/libfdt/fdt.c echo "#include <../lib/libfdt/fdt_ro.c>" >tools/lib/libfdt/fdt_ro.c cc -Wp,-MD,tools/lib/libfdt/.fdt_ro.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_ro.o tools/lib/libfdt/fdt_ro.c echo "#include <../lib/libfdt/fdt_rw.c>" >tools/lib/libfdt/fdt_rw.c cc -Wp,-MD,tools/lib/libfdt/.fdt_rw.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_rw.o tools/lib/libfdt/fdt_rw.c echo "#include <../lib/libfdt/fdt_strerror.c>" >tools/lib/libfdt/fdt_strerror.c cc -Wp,-MD,tools/lib/libfdt/.fdt_strerror.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_strerror.o tools/lib/libfdt/fdt_strerror.c echo "#include <../lib/libfdt/fdt_wip.c>" >tools/lib/libfdt/fdt_wip.c cc -Wp,-MD,tools/lib/libfdt/.fdt_wip.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_wip.o tools/lib/libfdt/fdt_wip.c echo "#include <../lib/libfdt/fdt_region.c>" >tools/lib/libfdt/fdt_region.c cc -Wp,-MD,tools/lib/libfdt/.fdt_region.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_region.o tools/lib/libfdt/fdt_region.c echo "#include <../lib/libfdt/fdt_sw.c>" >tools/lib/libfdt/fdt_sw.c cc -Wp,-MD,tools/lib/libfdt/.fdt_sw.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/lib/libfdt/fdt_sw.o tools/lib/libfdt/fdt_sw.c cc -Wp,-MD,tools/.dumpimage.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/dumpimage.o tools/dumpimage.c cc -o tools/dumpimage tools/aisimage.o tools/atmelimage.o tools/common/bootm.o tools/lib/crc32.o tools/default_image.o tools/lib/fdtdec_common.o tools/lib/fdtdec.o tools/fit_common.o tools/fit_image.o tools/gpimage.o tools/gpimage-common.o tools/common/image-fit.o tools/image-host.o tools/common/image.o tools/imagetool.o tools/imximage.o tools/kwbimage.o tools/lib/md5.o tools/lpc32xximage.o tools/mxsimage.o tools/omapimage.o tools/os_support.o tools/pblimage.o tools/pbl_crc32.o tools/lib/rc4.o tools/rkcommon.o tools/rkimage.o tools/rksd.o tools/rkspi.o tools/socfpgaimage.o tools/lib/sha1.o tools/lib/sha256.o tools/common/hash.o tools/ublimage.o tools/zynqimage.o tools/lib/libfdt/fdt.o tools/lib/libfdt/fdt_ro.o tools/lib/libfdt/fdt_rw.o tools/lib/libfdt/fdt_strerror.o tools/lib/libfdt/fdt_wip.o tools/lib/libfdt/fdt_region.o tools/lib/libfdt/fdt_sw.o tools/dumpimage.o cc -Wp,-MD,tools/.mkimage.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -c -o tools/mkimage.o tools/mkimage.c cc -o tools/mkimage tools/aisimage.o tools/atmelimage.o tools/common/bootm.o tools/lib/crc32.o tools/default_image.o tools/lib/fdtdec_common.o tools/lib/fdtdec.o tools/fit_common.o tools/fit_image.o tools/gpimage.o tools/gpimage-common.o tools/common/image-fit.o tools/image-host.o tools/common/image.o tools/imagetool.o tools/imximage.o tools/kwbimage.o tools/lib/md5.o tools/lpc32xximage.o tools/mxsimage.o tools/omapimage.o tools/os_support.o tools/pblimage.o tools/pbl_crc32.o tools/lib/rc4.o tools/rkcommon.o tools/rkimage.o tools/rksd.o tools/rkspi.o tools/socfpgaimage.o tools/lib/sha1.o tools/lib/sha256.o tools/common/hash.o tools/ublimage.o tools/zynqimage.o tools/lib/libfdt/fdt.o tools/lib/libfdt/fdt_ro.o tools/lib/libfdt/fdt_rw.o tools/lib/libfdt/fdt_strerror.o tools/lib/libfdt/fdt_wip.o tools/lib/libfdt/fdt_region.o tools/lib/libfdt/fdt_sw.o tools/mkimage.o cc -Wp,-MD,tools/.proftool.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -include ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include -I./lib/libfdt -I./tools -DCONFIG_SYS_TEXT_BASE=0x0 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -D_GNU_SOURCE -o tools/proftool tools/proftool.c cc -o tools/fdtgrep tools/lib/libfdt/fdt.o tools/lib/libfdt/fdt_ro.o tools/lib/libfdt/fdt_rw.o tools/lib/libfdt/fdt_strerror.o tools/lib/libfdt/fdt_wip.o tools/lib/libfdt/fdt_region.o tools/lib/libfdt/fdt_sw.o tools/fdtgrep.o make -f ./scripts/Makefile.build obj=arch/arm/cpu make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t/s3c24x0 arch/arm/cpu/arm920t/s3c24x0/cpu_info.o arch/arm/cpu/arm920t/s3c24x0/speed.o arch/arm/cpu/arm920t/s3c24x0/timer.o arch/arm/cpu/arm920t/cpu.o arch/arm/cpu/arm920t/s3c24x0/built-in.o make -f ./scripts/Makefile.build obj=arch/arm/lib arch/arm/lib/vectors.o arch/arm/lib/crt0.o arch/arm/lib/relocate.o arch/arm/lib/bootm.o arch/arm/lib/sections.o arch/arm/lib/stack.o arch/arm/lib/interrupts.o arch/arm/lib/reset.o arch/arm/lib/cache.o arch/arm/lib/cache-cp15.o make -f ./scripts/Makefile.build obj=board/samsung/common make -f ./scripts/Makefile.build obj=board/samsung/smdk2410 board/samsung/smdk2410/smdk2410.o board/samsung/smdk2410/lowlevel_init.o make -f ./scripts/Makefile.build obj=cmd arm-linux-gcc -Wp,-MD,cmd/.version.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(version)" -D"KBUILD_MODNAME=KBUILD_STR(version)" -c -o cmd/version.o cmd/version.c cmd/boot.o cmd/bootm.o cmd/help.o cmd/version.o cmd/source.o cmd/bdinfo.o cmd/cache.o cmd/console.o cmd/date.o cmd/echo.o cmd/elf.o cmd/exit.o cmd/ext2.o cmd/fat.o cmd/flash.o cmd/itest.o cmd/load.o cmd/mem.o cmd/misc.o cmd/mtdparts.o cmd/nand.o cmd/net.o cmd/pcmcia.o cmd/reginfo.o cmd/test.o cmd/ubi.o cmd/ubifs.o cmd/usb.o cmd/ximg.o cmd/yaffs2.o cmd/nvedit.o cmd/disk.o arm-linux-ld -r -o cmd/built-in.o cmd/boot.o cmd/bootm.o cmd/help.o cmd/version.o cmd/source.o cmd/bdinfo.o cmd/cache.o cmd/console.o cmd/date.o cmd/echo.o cmd/elf.o cmd/exit.o cmd/ext2.o cmd/fat.o cmd/flash.o cmd/itest.o cmd/load.o cmd/mem.o cmd/misc.o cmd/mtdparts.o cmd/nand.o cmd/net.o cmd/pcmcia.o cmd/reginfo.o cmd/test.o cmd/ubi.o cmd/ubifs.o cmd/usb.o cmd/ximg.o cmd/yaffs2.o cmd/nvedit.o cmd/disk.o make -f ./scripts/Makefile.build obj=common make -f ./scripts/Makefile.build obj=common/init common/init/board_init.o arm-linux-gcc -Wp,-MD,common/.main.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(main)" -D"KBUILD_MODNAME=KBUILD_STR(main)" -c -o common/main.o common/main.c arm-linux-gcc -Wp,-MD,common/.board_f.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(board_f)" -D"KBUILD_MODNAME=KBUILD_STR(board_f)" -c -o common/board_f.o common/board_f.c common/init/built-in.o common/main.o common/exports.o common/hash.o common/cli_hush.o common/autoboot.o common/bootretry.o common/board_f.o common/board_r.o common/bootm.o common/bootm_os.o common/env_attr.o common/env_callback.o common/env_flags.o common/env_flash.o common/usb.o common/usb_hub.o common/usb_storage.o common/flash.o common/splash.o common/usb_kbd.o common/env_common.o common/console.o common/dlmalloc.o common/image.o common/memsize.o common/stdio.o common/cli_simple.o common/cli.o common/cli_readline.o common/command.o common/s_record.o common/xyzModem.o arm-linux-ld -r -o common/built-in.o common/init/built-in.o common/main.o common/exports.o common/hash.o common/cli_hush.o common/autoboot.o common/bootretry.o common/board_f.o common/board_r.o common/bootm.o common/bootm_os.o common/env_attr.o common/env_callback.o common/env_flags.o common/env_flash.o common/usb.o common/usb_hub.o common/usb_storage.o common/flash.o common/splash.o common/usb_kbd.o common/env_common.o common/console.o common/dlmalloc.o common/image.o common/memsize.o common/stdio.o common/cli_simple.o common/cli.o common/cli_readline.o common/command.o common/s_record.o common/xyzModem.o arm-linux-gcc -Wp,-MD,common/.env_embedded.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -Wa,--no-warn -DENV_CRC=0 -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(env_embedded)" -D"KBUILD_MODNAME=KBUILD_STR(env_embedded)" -c -o common/env_embedded.o common/env_embedded.c make -f ./scripts/Makefile.build obj=disk disk/part.o disk/part_dos.o make -f ./scripts/Makefile.build obj=drivers make -f ./scripts/Makefile.build obj=drivers/adc make -f ./scripts/Makefile.build obj=drivers/block make -f ./scripts/Makefile.build obj=drivers/crypto make -f ./scripts/Makefile.build obj=drivers/crypto/fsl drivers/crypto/fsl/sec.o make -f ./scripts/Makefile.build obj=drivers/crypto/rsa_mod_exp drivers/crypto/rsa_mod_exp/built-in.o drivers/crypto/fsl/built-in.o make -f ./scripts/Makefile.build obj=drivers/dfu make -f ./scripts/Makefile.build obj=drivers/hwmon make -f ./scripts/Makefile.build obj=drivers/input drivers/input/input.o make -f ./scripts/Makefile.build obj=drivers/memory make -f ./scripts/Makefile.build obj=drivers/misc make -f ./scripts/Makefile.build obj=drivers/pcmcia drivers/pcmcia/tqm8xx_pcmcia.o make -f ./scripts/Makefile.build obj=drivers/pwm make -f ./scripts/Makefile.build obj=drivers/rtc drivers/rtc/date.o drivers/rtc/s3c24x0_rtc.o make -f ./scripts/Makefile.build obj=drivers/soc make -f ./scripts/Makefile.build obj=drivers/sound make -f ./scripts/Makefile.build obj=drivers/spmi make -f ./scripts/Makefile.build obj=drivers/thermal make -f ./scripts/Makefile.build obj=drivers/timer make -f ./scripts/Makefile.build obj=drivers/tpm make -f ./scripts/Makefile.build obj=drivers/twserial make -f ./scripts/Makefile.build obj=drivers/video make -f ./scripts/Makefile.build obj=drivers/video/bridge drivers/video/bridge/built-in.o make -f ./scripts/Makefile.build obj=drivers/watchdog drivers/adc/built-in.o drivers/block/built-in.o drivers/crypto/built-in.o drivers/hwmon/built-in.o drivers/misc/built-in.o drivers/pcmcia/built-in.o drivers/dfu/built-in.o drivers/rtc/built-in.o drivers/sound/built-in.o drivers/spmi/built-in.o drivers/timer/built-in.o drivers/tpm/built-in.o drivers/twserial/built-in.o drivers/video/built-in.o drivers/watchdog/built-in.o drivers/memory/built-in.o drivers/pwm/built-in.o drivers/input/built-in.o drivers/soc/built-in.o drivers/thermal/built-in.o make -f ./scripts/Makefile.build obj=drivers/dma make -f ./scripts/Makefile.build obj=drivers/gpio make -f ./scripts/Makefile.build obj=drivers/i2c make -f ./scripts/Makefile.build obj=drivers/mmc make -f ./scripts/Makefile.build obj=drivers/mtd drivers/mtd/mtdcore.o drivers/mtd/mtd_uboot.o drivers/mtd/mtdpart.o drivers/mtd/cfi_flash.o drivers/mtd/jedec_flash.o make -f ./scripts/Makefile.build obj=drivers/mtd/nand drivers/mtd/nand/nand.o drivers/mtd/nand/nand_bbt.o drivers/mtd/nand/nand_ids.o drivers/mtd/nand/nand_util.o drivers/mtd/nand/nand_ecc.o drivers/mtd/nand/nand_base.o drivers/mtd/nand/nand_timings.o drivers/mtd/nand/s3c2410_nand.o make -f ./scripts/Makefile.build obj=drivers/mtd/onenand make -f ./scripts/Makefile.build obj=drivers/mtd/spi make -f ./scripts/Makefile.build obj=drivers/mtd/ubi drivers/mtd/ubi/attach.o drivers/mtd/ubi/build.o drivers/mtd/ubi/vtbl.o drivers/mtd/ubi/vmt.o drivers/mtd/ubi/upd.o drivers/mtd/ubi/kapi.o drivers/mtd/ubi/eba.o drivers/mtd/ubi/io.o drivers/mtd/ubi/wl.o drivers/mtd/ubi/crc32.o drivers/mtd/ubi/misc.o drivers/mtd/ubi/debug.o make -f ./scripts/Makefile.build obj=drivers/net drivers/net/cs8900.o make -f ./scripts/Makefile.build obj=drivers/net/phy make -f ./scripts/Makefile.build obj=drivers/pci make -f ./scripts/Makefile.build obj=drivers/power make -f ./scripts/Makefile.build obj=drivers/power/battery make -f ./scripts/Makefile.build obj=drivers/power/fuel_gauge make -f ./scripts/Makefile.build obj=drivers/power/mfd make -f ./scripts/Makefile.build obj=drivers/power/pmic make -f ./scripts/Makefile.build obj=drivers/power/regulator make -f ./scripts/Makefile.build obj=drivers/serial drivers/serial/serial.o drivers/serial/serial_s3c24x0.o make -f ./scripts/Makefile.build obj=drivers/spi drivers/spi/spi.o make -f ./scripts/Makefile.build obj=drivers/usb/common make -f ./scripts/Makefile.build obj=drivers/usb/dwc3 make -f ./scripts/Makefile.build obj=drivers/usb/emul make -f ./scripts/Makefile.build obj=drivers/usb/eth make -f ./scripts/Makefile.build obj=drivers/usb/gadget make -f ./scripts/Makefile.build obj=drivers/usb/gadget/udc make -f ./scripts/Makefile.build obj=drivers/usb/host drivers/usb/host/ohci-s3c24xx.o make -f ./scripts/Makefile.build obj=drivers/usb/musb-new make -f ./scripts/Makefile.build obj=drivers/usb/musb make -f ./scripts/Makefile.build obj=drivers/usb/phy make -f ./scripts/Makefile.build obj=drivers/usb/ulpi make -f ./scripts/Makefile.build obj=fs make -f ./scripts/Makefile.build obj=fs/ext4 fs/ext4/ext4fs.o fs/ext4/ext4_common.o fs/ext4/dev.o make -f ./scripts/Makefile.build obj=fs/fat fs/fat/fat.o fs/fat/file.o make -f ./scripts/Makefile.build obj=fs/ubifs fs/ubifs/ubifs.o fs/ubifs/io.o fs/ubifs/super.o fs/ubifs/sb.o fs/ubifs/master.o fs/ubifs/lpt.o fs/ubifs/lpt_commit.o fs/ubifs/scan.o fs/ubifs/lprops.o fs/ubifs/tnc.o fs/ubifs/tnc_misc.o fs/ubifs/debug.o fs/ubifs/crc16.o fs/ubifs/budget.o fs/ubifs/log.o fs/ubifs/orphan.o fs/ubifs/recovery.o fs/ubifs/replay.o fs/ubifs/gc.o make -f ./scripts/Makefile.build obj=fs/yaffs2 fs/yaffs2/yaffs_allocator.o fs/yaffs2/yaffs_attribs.o fs/yaffs2/yaffs_bitmap.o fs/yaffs2/yaffs_uboot_glue.o fs/yaffs2/yaffs_checkptrw.o fs/yaffs2/yaffs_ecc.o fs/yaffs2/yaffs_error.o fs/yaffs2/yaffsfs.o fs/yaffs2/yaffs_guts.o fs/yaffs2/yaffs_nameval.o fs/yaffs2/yaffs_nand.o fs/yaffs2/yaffs_packedtags1.o fs/yaffs2/yaffs_packedtags2.o fs/yaffs2/yaffs_qsort.o fs/yaffs2/yaffs_summary.o fs/yaffs2/yaffs_tagscompat.o fs/yaffs2/yaffs_verify.o fs/yaffs2/yaffs_yaffs1.o fs/yaffs2/yaffs_yaffs2.o fs/yaffs2/yaffs_mtdif.o fs/yaffs2/yaffs_mtdif2.o fs/fs.o fs/ext4/built-in.o fs/fat/built-in.o fs/ubifs/built-in.o fs/yaffs2/built-in.o make -f ./scripts/Makefile.build obj=lib make -f ./scripts/Makefile.build obj=lib/bzip2 lib/bzip2/bzlib.o lib/bzip2/bzlib_crctable.o lib/bzip2/bzlib_decompress.o lib/bzip2/bzlib_randtable.o lib/bzip2/bzlib_huffman.o make -f ./scripts/Makefile.build obj=lib/lzma lib/lzma/LzmaDec.o lib/lzma/LzmaTools.o make -f ./scripts/Makefile.build obj=lib/lzo lib/lzo/lzo1x_decompress.o make -f ./scripts/Makefile.build obj=lib/zlib lib/zlib/zlib.o arm-linux-gcc -Wp,-MD,lib/.display_options.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(display_options)" -D"KBUILD_MODNAME=KBUILD_STR(display_options)" -c -o lib/display_options.o lib/display_options.c lib/lzma/built-in.o lib/lzo/built-in.o lib/zlib/built-in.o lib/bzip2/built-in.o lib/crc7.o lib/crc8.o lib/crc16.o lib/gunzip.o lib/initcall.o lib/lmb.o lib/ldiv.o lib/net_utils.o lib/qsort.o lib/rc4.o lib/strmhz.o lib/rbtree.o lib/list_sort.o lib/hashtable.o lib/errno.o lib/display_options.o lib/crc32.o lib/ctype.o lib/div64.o lib/hang.o lib/linux_compat.o lib/linux_string.o lib/membuff.o lib/slre.o lib/string.o lib/time.o lib/vsprintf.o lib/panic.o lib/strto.o arm-linux-ld -r -o lib/built-in.o lib/lzma/built-in.o lib/lzo/built-in.o lib/zlib/built-in.o lib/bzip2/built-in.o lib/crc7.o lib/crc8.o lib/crc16.o lib/gunzip.o lib/initcall.o lib/lmb.o lib/ldiv.o lib/net_utils.o lib/qsort.o lib/rc4.o lib/strmhz.o lib/rbtree.o lib/list_sort.o lib/hashtable.o lib/errno.o lib/display_options.o lib/crc32.o lib/ctype.o lib/div64.o lib/hang.o lib/linux_compat.o lib/linux_string.o lib/membuff.o lib/slre.o lib/string.o lib/time.o lib/vsprintf.o lib/panic.o lib/strto.o make -f ./scripts/Makefile.build obj=net net/checksum.o net/arp.o net/bootp.o net/eth_legacy.o net/eth_common.o net/net.o net/nfs.o net/ping.o net/tftp.o make -f ./scripts/Makefile.build obj=test make -f ./scripts/Makefile.build obj=test/dm make -f ./scripts/Makefile.build obj=examples make -f ./scripts/Makefile.build obj=examples/standalone arm-linux-gcc -Wp,-MD,examples/standalone/.stubs.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -fno-toplevel-reorder -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(stubs)" -D"KBUILD_MODNAME=KBUILD_STR(stubs)" -c -o examples/standalone/stubs.o examples/standalone/stubs.c arm-linux-ld -r -o examples/standalone/libstubs.o examples/standalone/stubs.o arm-linux-gcc -Wp,-MD,examples/standalone/.hello_world.o.d -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -Wno-format-nonliteral -fno-toplevel-reorder -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(hello_world)" -D"KBUILD_MODNAME=KBUILD_STR(hello_world)" -c -o examples/standalone/hello_world.o examples/standalone/hello_world.c arm-linux-ld -g -Ttext 0xc100000 -o examples/standalone/hello_world -e hello_world examples/standalone/hello_world.o examples/standalone/libstubs.o -L /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/armv4t -lgcc arm-linux-objcopy -O srec examples/standalone/hello_world examples/standalone/hello_world.srec arm-linux-objcopy -O binary examples/standalone/hello_world examples/standalone/hello_world.bin arm-linux-gcc -E -Wp,-MD,./.u-boot.lds.d -D__KERNEL__ -D__UBOOT__ -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -include ./include/u-boot/u-boot.lds.h -DCPUDIR=arch/arm/cpu/arm920t -ansi -D__ASSEMBLY__ -x assembler-with-cpp -P -o u-boot.lds arch/arm/cpu/u-boot.lds arm-linux-ld -pie --gc-sections -Bstatic -Ttext 0x0 -o u-boot -T u-boot.lds arch/arm/cpu/arm920t/start.o --start-group arch/arm/cpu/built-in.o arch/arm/cpu/arm920t/built-in.o arch/arm/lib/built-in.o board/samsung/common/built-in.o board/samsung/smdk2410/built-in.o cmd/built-in.o common/built-in.o disk/built-in.o drivers/built-in.o drivers/dma/built-in.o drivers/gpio/built-in.o drivers/i2c/built-in.o drivers/mmc/built-in.o drivers/mtd/built-in.o drivers/mtd/nand/built-in.o drivers/mtd/onenand/built-in.o drivers/mtd/spi/built-in.o drivers/mtd/ubi/built-in.o drivers/net/built-in.o drivers/net/phy/built-in.o drivers/pci/built-in.o drivers/power/built-in.o drivers/power/battery/built-in.o drivers/power/fuel_gauge/built-in.o drivers/power/mfd/built-in.o drivers/power/pmic/built-in.o drivers/power/regulator/built-in.o drivers/serial/built-in.o drivers/spi/built-in.o drivers/usb/common/built-in.o drivers/usb/dwc3/built-in.o drivers/usb/emul/built-in.o drivers/usb/eth/built-in.o drivers/usb/gadget/built-in.o drivers/usb/gadget/udc/built-in.o drivers/usb/host/built-in.o drivers/usb/musb-new/built-in.o drivers/usb/musb/built-in.o drivers/usb/phy/built-in.o drivers/usb/ulpi/built-in.o fs/built-in.o lib/built-in.o net/built-in.o test/built-in.o test/dm/built-in.o --end-group arch/arm/lib/eabi_compat.o -L /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/armv4t -lgcc -Map u-boot.map arm-linux-objcopy --gap-fill=0xff -j .text -j .secure_text -j .rodata -j .hash -j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn -O srec u-boot u-boot.srec arm-linux-objcopy --gap-fill=0xff -j .text -j .secure_text -j .rodata -j .hash -j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn -O binary u-boot u-boot-nodtb.bin cp u-boot-nodtb.bin u-boot.bin arm-linux-objdump -t u-boot > u-boot.sym arm-linux-gcc -E -Wp,-MD,./.u-boot.cfg.d -D__KERNEL__ -D__UBOOT__ -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t -Iinclude -I./arch/arm/include -include ./include/linux/kconfig.h -nostdinc -isystem /usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/include -include ./include/u-boot/u-boot.lds.h -DCPUDIR=arch/arm/cpu/arm920t -ansi -DDO_DEPS_ONLY -D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o u-boot.cfg include/config.h
我们大致看一下输出内容，主要包括以下两点：
-
先利用./scripts/Makefile.build编译各个built-in.o目标文件；
- 再将各个bult-in.o文件链接成u-boot；
二、make编译过程
make在编译过程中，会根据不用的obj，编译生成相应的xxx/.../xxxx/built-in.o文件。
make -f ./scripts/Makefile.build obj=目标路径 #执行目标下的Makefile生成build-in.o
然后由这些文件最终链接连接成u-boot文件：
arm-linux-ld -pie --gc-sections -Bstatic -Ttext 0x0 -o u-boot -T u-boot.lds arch/arm/cpu/arm920t/start.o --sn.o common/built-in.o disk/built-in.o drivers/built-in.o drivers/dma/built-in.o drivers/gpio/built-in.o dribuilt-in.o drivers/net/built-in.o drivers/net/phy/built-in.o drivers/pci/built-in.o drivers/power/built-in.o rs/serial/built-in.o drivers/spi/built-in.o drivers/usb/common/built-in.o drivers/usb/dwc3/built-in.o drivers.o drivers/usb/musb/built-in.o drivers/usb/phy/built-in.o drivers/usb/ulpi/built-in.o fs/built-in.o lib/buil -lgcc -Map u-boot.map
不知道你们有没有留意到吗，在make的编译过程中，有以下几个步骤：
make -f ./scripts/Makefile.build obj=arch/arm/cpu make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t/s3c24x0
我们从最后一个来说，这里将会跳转到./script/Makefile.build文件中去执行，然后include obj路径下的Makefile文件，即arch/arm/cpu/arm920t/s3c24x0/Makefile。
2.1 arch/arm/cpu/arm920t/s3c24x0/Makefile
arch/arm/cpu/arm920t/s3c24x0/Makefile:
# # (C) Copyright 2000-2006 # Wolfgang Denk, DENX Software Engineering, wd@denx.de. # # SPDX-License-Identifier: GPL-2.0+ # obj-$(CONFIG_USE_IRQ) += interrupts.o obj-$(CONFIG_DISPLAY_CPUINFO) += cpu_info.o obj-y += speed.o obj-y += timer.o
obj-y是在./script/Makefile.build文件中定义：
obj-y :=
最终目标arch/arm/cpu/arm920t/s3c24x0/built-in.o依赖的obj-y如下：
- arch/arm/cpu/arm920t/s3c24x0/cpu_info.o
- arch/arm/cpu/arm920t/s3c24x0/speed.o
- arch/arm/cpu/arm920t/s3c24x0/timer.o
2.2 arch/arm/cpu/arm920t/Makefile
同理，arch/arm/cpu/arm920t/Makefile:
# # (C) Copyright 2000-2006 # Wolfgang Denk, DENX Software Engineering, wd@denx.de. # # SPDX-License-Identifier: GPL-2.0+ # extra-y = start.o obj-y += cpu.o # 1 obj-$(CONFIG_USE_IRQ) += interrupts.o obj-$(CONFIG_EP93XX) += ep93xx/ obj-$(CONFIG_IMX) += imx/ obj-$(CONFIG_S3C24X0) += s3c24x0/ #2 以%/结尾最终会被替换成%/built-in.o # some files can only build in ARM mode ifdef CONFIG_SYS_THUMB_BUILD CFLAGS_cpu.o := -marm endif
最终目标arch/arm/cpu/arm920t/built-in.o依赖的obj-y如下：
- arch/arm/cpu/arm920t/cpu.o
- arch/arm/cpu/arm920t/s3c24x0/built-in.o
2.3 arch/arm/cpu/Makefile
arch/arm/cpu/Makefile:
# # SPDX-License-Identifier: GPL-2.0+ # obj- += dummy.o
最终obj-y为空，所以生成的arch/arm/cpu/built-in.o文件实际是空的。
2.4 ./scripts/Makefile.build
我们在之前介绍过，u-boot目标依赖于$(u-boot-main)、$(u-boot-init)、u-boot.lds。
u-boot-init := $(head-y)
u-boot-main := $(libs-y)
而libs-y由若干个以built-in.o结尾的文件组成，lib-y大致如下：
libs-y = lib/built-in.o fs/built-in.o net/built-in.o disk/built-in.o drivers/built-in.o drivers/dma/built-in.o drivers/gpio/built-in.o ...
而libs-y中的各个built-in.o文件由./scripts/Makefile.build编译而成：
ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) builtin-target := $(obj)/built-in.o endif $(builtin-target): $(obj-y) FORCE $(call if_changed,link_o_target)
比如make -f ./scripts/Makefile.build obj=arch/arm/cpu编译生成了arch/arm/cpu/build-in.o（builtin-target=arch/arm/cpu/built-in.o）。
而obj-y是由若干个.o目标文件组成，这里我将上面三条步骤中的obj-y输出，如下：
make -f ./scripts/Makefile.build obj=arch/arm/cpu make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t make -f ./scripts/Makefile.build obj=arch/arm/cpu/arm920t/s3c24x0 --------------------------------------- arch/arm/cpu/arm920t/s3c24x0/cpu_info.o arch/arm/cpu/arm920t/s3c24x0/speed.o arch/arm/cpu/arm920t/s3c24x0/timer.o arch/arm/cpu/arm920t/cpu.o arch/arm/cpu/arm920t/s3c24x0/built-in.o
不存在
obj-y依赖的.o文件又是怎么生成的，生成规则也是在./scripts/Makefile.build有定义：
$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
$(call cmd,force_checksrc)
$(call if_changed_rule,cc_o_c)
这里src可以看做和obj相同：
- 当obj=arch/arm/cpu时，即定义了arch/arm/cpu/%.o文件的生成规则；
- 当obj=arch/arm/cpu/arm920t时，即定义了arch/arm/cpu/arm920t/%.o文件的生成规则；
- 当obj=arch/arm/cpu/arm920t/s3c24x0时，即定义了arch/arm/cpu/arm920t/s3c24x0/%.o文件的生成规则；
命令中的if_changed_rule函数定义在scripts/Kbuild.include文件中
# Usage: $(call if_changed_rule,foo) # Will check if $(cmd_foo) or any of the prerequisites changed, # and if so will execute $(rule_foo). if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), @set -e; $(rule_$(1)))
在./scripts/Makefile.build有如下定义：
define rule_cc_o_c $(call echo-cmd,checksrc) $(cmd_checksrc) $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); $(cmd_modversions) $(call echo-cmd,record_mcount) $(cmd_record_mcount) scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(dot-target).tmp; rm -f $(depfile); mv -f $(dot-target).tmp $(dot-target).cmd endef
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
所以调用$(call if_changed_rule,cc_o_c)等价于执行cmd_cc_o_c。
这里我们重点介绍一下cmc_cc_o_c，因为这里在使用arm-linux-gcc编译时指定了c_flags参数（在顶层Makefile中定义）：
ifeq ($(dot-config),1) # Read in config -include include/config/auto.conf # 1. 引入头文件 # Use UBOOTINCLUDE when you must reference the include/ directory. # Needed to be compatible with the O= option UBOOTINCLUDE := # 2. 变量定义 -Iinclude $(if $(KBUILD_SRC), -I$(srctree)/include) $(if $(CONFIG_SYS_THUMB_BUILD), $(if $(CONFIG_HAS_THUMB2),, -I$(srctree)/arch/$(ARCH)/thumb1/include),) -I$(srctree)/arch/$(ARCH)/include -include $(srctree)/include/linux/kconfig.h NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) CHECKFLAGS += $(NOSTDINC_FLAGS) # FIX ME cpp_flags := $(KBUILD_CPPFLAGS) $(PLATFORM_CPPFLAGS) $(UBOOTINCLUDE) $(NOSTDINC_FLAGS) c_flags := $(KBUILD_CFLAGS) $(cpp_flags)
include/config/auto.conf.cmd是由fixdep在编译时生成的依赖文件，主要定义了常量，包含CPU信息、系统配置参数：
这里我们重点关注UBOOTINCLUDE和PLATFORM_CPPFLAGS：
(1) PLATFORM_CPPFLAGS是干嘛用的呢，之前我们介绍过built-in.o在生成时，依赖若干个.o目标文件，这些.o文件在生成时也会引入一些头文件，这些头文件一般都位于built-in.o同路径下得include 文件下，通过-I参数指定搜索的头路径，从而将这些头文件包含进来，比如arcm/arm/Makefile文件中指定了（需要注意的是这个追加的参数只有在编译arcm/arm/built-in.o时有效）：
PLATFORM_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
(2) UBOOTINCLUDE 引入了./include、./arch/arm/include目录下的头文件、以及./include/linux/kconfig.h文件。其中./include/linux/kconfig.h文件引入了./include/generated/autoconf.h，包含了u-boot编译时所需要的各种宏的定义。
2.5 arch/arm/Makefile
# # SPDX-License-Identifier: GPL-2.0+ # ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TEGRA),yy) CONFIG_CPU_V7= CONFIG_CPU_ARM720T=y endif # This selects which instruction set is used. arch-$(CONFIG_CPU_ARM720T) =-march=armv4 arch-$(CONFIG_CPU_ARM920T) =-march=armv4t arch-$(CONFIG_CPU_ARM926EJS) =-march=armv5te arch-$(CONFIG_CPU_ARM946ES) =-march=armv4 arch-$(CONFIG_CPU_SA1100) =-march=armv4 arch-$(CONFIG_CPU_PXA) = arch-$(CONFIG_CPU_ARM1136) =-march=armv5 arch-$(CONFIG_CPU_ARM1176) =-march=armv5t arch-$(CONFIG_CPU_V7) =$(call cc-option, -march=armv7-a, $(call cc-option, -march=armv7, -march=armv5)) arch-$(CONFIG_ARM64) =-march=armv8-a # Evaluate arch cc-option calls now arch-y := $(arch-y) # This selects how we optimise for the processor. tune-$(CONFIG_CPU_ARM720T) =-mtune=arm7tdmi tune-$(CONFIG_CPU_ARM920T) = tune-$(CONFIG_CPU_ARM926EJS) = tune-$(CONFIG_CPU_ARM946ES) = tune-$(CONFIG_CPU_SA1100) =-mtune=strongarm1100 tune-$(CONFIG_CPU_PXA) =-mcpu=xscale tune-$(CONFIG_CPU_ARM1136) = tune-$(CONFIG_CPU_ARM1176) = tune-$(CONFIG_CPU_V7) = tune-$(CONFIG_ARM64) = # Evaluate tune cc-option calls now tune-y := $(tune-y) PLATFORM_CPPFLAGS += $(arch-y) $(tune-y) # Machine directory name. This list is sorted alphanumerically # by CONFIG_* macro name. machine-$(CONFIG_ARCH_AT91) += at91 machine-$(CONFIG_ARCH_BCM283X) += bcm283x machine-$(CONFIG_ARCH_DAVINCI) += davinci machine-$(CONFIG_ARCH_EXYNOS) += exynos machine-$(CONFIG_ARCH_HIGHBANK) += highbank machine-$(CONFIG_ARCH_KEYSTONE) += keystone # TODO: rename CONFIG_KIRKWOOD -> CONFIG_ARCH_KIRKWOOD machine-$(CONFIG_KIRKWOOD) += kirkwood machine-$(CONFIG_ARCH_MVEBU) += mvebu # TODO: rename CONFIG_TEGRA -> CONFIG_ARCH_TEGRA # TODO: rename CONFIG_ORION5X -> CONFIG_ARCH_ORION5X machine-$(CONFIG_ORION5X) += orion5x machine-$(CONFIG_ARCH_S5PC1XX) += s5pc1xx machine-$(CONFIG_ARCH_SUNXI) += sunxi machine-$(CONFIG_ARCH_SNAPDRAGON) += snapdragon machine-$(CONFIG_ARCH_SOCFPGA) += socfpga machine-$(CONFIG_ARCH_ROCKCHIP) += rockchip machine-$(CONFIG_STM32) += stm32 machine-$(CONFIG_TEGRA) += tegra machine-$(CONFIG_ARCH_UNIPHIER) += uniphier machine-$(CONFIG_ARCH_ZYNQ) += zynq machdirs := $(patsubst %,arch/arm/mach-%/,$(machine-y)) #取出$(machine-y)所有值，并替换追加arch/arm/mach-xx/ 这里machdirs最终为空 PLATFORM_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs)) #machdirs路径下的include文件 gcc编译时，头文件指定 libs-y += $(machdirs) head-y := arch/arm/cpu/$(CPU)/start.o ifeq ($(CONFIG_SPL_BUILD),y) ifneq ($(CONFIG_SPL_START_S_PATH),) head-y := $(CONFIG_SPL_START_S_PATH:"%"=%)/start.o endif endif libs-y += arch/arm/cpu/$(CPU)/ libs-y += arch/arm/cpu/ libs-y += arch/arm/lib/ ifeq ($(CONFIG_SPL_BUILD),y) ifneq (,$(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_MX35)$(filter $(SOC), mx25 mx27 mx5 mx6 mx7 mx31 mx35)) libs-y += arch/arm/imx-common/ endif else ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx7 mx31 mx35 mxs vf610)) libs-y += arch/arm/imx-common/ endif endif ifneq (,$(filter $(SOC), kirkwood)) libs-y += arch/arm/mach-mvebu/ endif # deprecated -include $(machdirs)/config.mk
CONFIG_CPU_ARM920T=y在include/config/auto.conf文件中定义，而auto.conf文件是通过./srcipts/Makefile.build文件引入的：
[root@longmax2002 u-boot-2016.05]# grep "CONFIG_CPU_ARM920T" * -nR arch/arm/mach-at91/Makefile:19:obj-$(CONFIG_CPU_ARM920T) += arm920t/ arch/arm/Makefile:12:arch-$(CONFIG_CPU_ARM920T) =-march=armv4t arch/arm/Makefile:28:tune-$(CONFIG_CPU_ARM920T) = drivers/usb/host/ohci-hcd.c:53:#if defined(CONFIG_CPU_ARM920T) || include/config/auto.conf:65:CONFIG_CPU_ARM920T=y # 这一条 include/generated/autoconf.h:67:#define CONFIG_CPU_ARM920T 1 u-boot.cfg:144:#define CONFIG_CPU_ARM920T 1
如果想知道machdirs的值，修改该Makefile文件，在变量后面追加：
print_machdirs:: @echo "===================== WARNING ======================" @echo $(machdirs) @echo $(PLATFORM_CPPFLAGS)
在顶层执行make ARCH=arm CROSS_COMPILE=arm-linux- V=1 print_machdirs，可以获取变量的值：
其中machdirs为空，arm-linux-gcc编译参数PLATFORM_CPPFLAGS如下：
-D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv4t
三、u-boot启动流程
想要分析启动流程,第一步就是分析链接文件，弄清楚程序入口是哪里。在分析Makefile中，u-boot的依赖中可以看到链接脚本文件是u-boot.lds，u-boot.lds依赖于$(LDSCRIPT)和prepare。
3.1 u.boot.lds
通过对u-boot源代码编译会在顶层目录生成u-boot.lds，打开u-boot.lds：
$(LDSCRIPT)变量值为arch/arm/cpu/u-boot.lds，定位到该文件：
#include <config.h> OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") OUTPUT_ARCH(arm) ENTRY(_start) SECTIONS { #ifndef CONFIG_CMDLINE /DISCARD/ : { *(.u_boot_list_2_cmd_*) } #endif #if defined(CONFIG_ARMV7_SECURE_BASE) && defined(CONFIG_ARMV7_NONSEC) /* * If CONFIG_ARMV7_SECURE_BASE is true, secure code will not * bundle with u-boot, and code offsets are fixed. Secure zone * only needs to be copied from the loading address to * CONFIG_ARMV7_SECURE_BASE, which is the linking and running * address for secure code. * * If CONFIG_ARMV7_SECURE_BASE is undefined, the secure zone will * be included in u-boot address space, and some absolute address * were used in secure code. The absolute addresses of the secure * code also needs to be relocated along with the accompanying u-boot * code. * * So DISCARD is only for CONFIG_ARMV7_SECURE_BASE. */ /DISCARD/ : { *(.rel._secure*) } #endif . = 0x00000000; . = ALIGN(4); .text : { *(.__image_copy_start) *(.vectors) CPUDIR/start.o (.text*) *(.text*) } #ifdef CONFIG_ARMV7_NONSEC #ifndef CONFIG_ARMV7_SECURE_BASE #define CONFIG_ARMV7_SECURE_BASE #endif .__secure_start : { . = ALIGN(0x1000); *(.__secure_start) } .secure_text CONFIG_ARMV7_SECURE_BASE : AT(ADDR(.__secure_start) + SIZEOF(.__secure_start)) { *(._secure.text) } . = LOADADDR(.__secure_start) + SIZEOF(.__secure_start) + SIZEOF(.secure_text); __secure_end_lma = .; .__secure_end : AT(__secure_end_lma) { *(.__secure_end) LONG(0x1d1071c); /* Must output something to reset LMA */ } #endif . = ALIGN(4); .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) } . = ALIGN(4); .data : { *(.data*) } . = ALIGN(4); . = .; . = ALIGN(4); .u_boot_list : { KEEP(*(SORT(.u_boot_list*))); } . = ALIGN(4); .__efi_runtime_start : { *(.__efi_runtime_start) } .efi_runtime : { *(efi_runtime_text) *(efi_runtime_data) } .__efi_runtime_stop : { *(.__efi_runtime_stop) } .efi_runtime_rel_start : { *(.__efi_runtime_rel_start) } .efi_runtime_rel : { *(.relefi_runtime_text) *(.relefi_runtime_data) } .efi_runtime_rel_stop : { *(.__efi_runtime_rel_stop) } . = ALIGN(4); .image_copy_end : { *(.__image_copy_end) } .rel_dyn_start : { *(.__rel_dyn_start) } .rel.dyn : { *(.rel*) } .rel_dyn_end : { *(.__rel_dyn_end) } .end : { *(.__end) } _image_binary_end = .; /* * Deprecated: this MMU section is used by pxa at present but * should not be used by new boards/CPUs. */ . = ALIGN(4096); .mmutable : { *(.mmutable) } /* * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c * __bss_base and __bss_limit are for linker only (overlay ordering) */ .bss_start __rel_dyn_start (OVERLAY) : { KEEP(*(.__bss_start)); __bss_base = .; } .bss __bss_base (OVERLAY) : { *(.bss*) . = ALIGN(4); __bss_limit = .; } .bss_end __bss_limit (OVERLAY) : { KEEP(*(.__bss_end)); } .dynsym _image_binary_end : { *(.dynsym) } .dynbss : { *(.dynbss) } .dynstr : { *(.dynstr*) } .dynamic : { *(.dynamic*) } .plt : { *(.plt*) } .interp : { *(.interp*) } .gnu.hash : { *(.gnu.hash) } .gnu : { *(.gnu*) } .ARM.exidx : { *(.ARM.exidx*) } .gnu.linkonce.armexidx : { *(.gnu.linkonce.armexidx.*) } }
其中：
(1) OUTPUT_FORMAT：指定输出可执行文件是elf格式,32位ARM指令,小端；
(2) OUTPUT_ARCH：指出输出可执行文件的平台是ARM；
(3) ENTRY：指定输出可执行文件的起始入口码段是_start，_start在arch/arm/cpu/arm920t/start.S；
(4) 0x00000000是程序的链接起始地点，arm-linux-ld最终生成的uboot.bin链接地址是从0x00000000开始；
(5) .text{}：声明该段是代码段，在此段中依次存放section(.__image_copy_start)、section(.vectors)、 section(start.o中所有的代码段 (.text*))、section(*(.text*))剩余的所有代码段。
*(.__image_copy_start)：这里比较有意思的是section(.__image_copy_start)，在arch/arm/lib/sections.c中有如下定义：
char __image_copy_start[0] __attribute__((section(".__image_copy_start")));
这是一个0长度的数组，GNU 对C的扩展，实际达到的目的就是section(.__image_copy_start)在链接时不占用链接地址空间，其后的section(.vectors)起始地址依然是0x00000000，然后在__image_copy_start存放了一个地址，也就是0x00000000，相当于创建一个位置标签；代表程序重定位(relocate)时拷贝的起始地址；
*(.vectors)：字面上的意思就是向量段，在arch/arm/lib/vectors.S中定义了.verctos段：.section ".vectors", "ax"；这是一个自定义的段标签的伪操作，含义是：定义一个段标签名为.vectors，且为允许、可执行段；
CPUDIR/start.o (.text*)：CPUDIR在根目录的Makefile中定义，根据芯片；选择不同的start.S编译，编译出的start.o中.text段，链接到此处；在这里CPUDIR=arch/arm/cpu/arm920t；
*(.text*)：剩余所有的代码都放到此段；
(6) .rodata{}：声明只读数据段，简称rodata段，存放常量，字符常量，const常量，据说还存放调试信息；
(7) .data{}：声明初始化数据段(Initialized data segment)，简称data段，存放程序中已经初始化全局与初始化静态变量；
(8) .bss{}：声明未始化数据段(Uninitialized data segment)，简称bss段，存放程序中未初始化全局与未初始化静态变量，该区域会在程序载入时由内核清零；
__image_copy_start、__image_copy_end用于u-boot搬移本身image到指定的ddr地址处；
__rel_dyn_start、__rel_dyn_end用于重定位代码；
__bss_start、__bss_end是bss段的开始、结束地址；
这几个变量在arch/arm/lib/sections.c中使用，定义一些全局变量作用于各个段的起始地址：
//C文件中利用这种方式把一个变量或者函数标记到指定段。 char __bss_start[0] __attribute__((section(".__bss_start"))); char __bss_end[0] __attribute__((section(".__bss_end"))); char __image_copy_start[0] __attribute__((section(".__image_copy_start"))); char __image_copy_end[0] __attribute__((section(".__image_copy_end"))); char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start"))); char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end"))); char __secure_start[0] __attribute__((section(".__secure_start"))); char __secure_end[0] __attribute__((section(".__secure_end")));
3.2 vectors(中断向量表)
我们接下来分析代码，程序的第一条指令就是在arch/arm/lib/vectors.S中。
/* * vectors - Generic ARM exception table code * * Copyright (c) 1998 Dan Malek <dmalek@jlc.net> * Copyright (c) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> * Copyright (c) 2000 Wolfgang Denk <wd@denx.de> * Copyright (c) 2001 Alex Züpke <azu@sysgo.de> * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> * Copyright (c) 2002 Kyle Harris <kharris@nexus-tech.net> * * SPDX-License-Identifier: GPL-2.0+ */ #include <config.h> /* ************************************************************************* * * Symbol _start is referenced elsewhere, so make it global * ************************************************************************* */ .globl _start //声明__start全局符号，这个符号会在lds链接脚本中使用 /* ************************************************************************* * * Vectors have their own section so linker script can map them easily * ************************************************************************* */ .section ".vectors", "ax" /* ************************************************************************* * * Exception vectors as described in ARM reference manuals * * Uses indirect branch to allow reaching handlers anywhere in memory. * ************************************************************************* */ _start: #ifdef CONFIG_SYS_DV_NOR_BOOT_CFG .word CONFIG_SYS_DV_NOR_BOOT_CFG #endif b reset ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort ldr pc, _data_abort ldr pc, _not_used ldr pc, _irq ldr pc, _fiq /* ************************************************************************* * * Indirect vectors table * * Symbols referenced here must be defined somewhere else * ************************************************************************* */ .globl _undefined_instruction .globl _software_interrupt .globl _prefetch_abort .globl _data_abort .globl _not_used .globl _irq .globl _fiq _undefined_instruction: .word undefined_instruction _software_interrupt: .word software_interrupt _prefetch_abort: .word prefetch_abort _data_abort: .word data_abort _not_used: .word not_used _irq: .word irq _fiq: .word fiq .balignl 16,0xdeadbeef /* ************************************************************************* * * Interrupt handling * ************************************************************************* */ /* SPL interrupt handling: just hang */ #ifdef CONFIG_SPL_BUILD .align 5 undefined_instruction: software_interrupt: prefetch_abort: data_abort: not_used: irq: fiq: 1: bl 1b /* hang and never return */ #else /* !CONFIG_SPL_BUILD */ /* IRQ stack memory (calculated at run-time) + 8 bytes */ .globl IRQ_STACK_START_IN IRQ_STACK_START_IN: .word 0x0badc0de #ifdef CONFIG_USE_IRQ /* IRQ stack memory (calculated at run-time) */ .globl IRQ_STACK_START IRQ_STACK_START: .word 0x0badc0de /* IRQ stack memory (calculated at run-time) */ .globl FIQ_STACK_START FIQ_STACK_START: .word 0x0badc0de #endif /* CONFIG_USE_IRQ */ @ @ IRQ stack frame. @ #define S_FRAME_SIZE 72 #define S_OLD_R0 68 #define S_PSR 64 #define S_PC 60 #define S_LR 56 #define S_SP 52 #define S_IP 48 #define S_FP 44 #define S_R10 40 #define S_R9 36 #define S_R8 32 #define S_R7 28 #define S_R6 24 #define S_R5 20 #define S_R4 16 #define S_R3 12 #define S_R2 8 #define S_R1 4 #define S_R0 0 #define MODE_SVC 0x13 #define I_BIT 0x80 /* * use bad_save_user_regs for abort/prefetch/undef/swi ... * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling */ .macro bad_save_user_regs @ carve out a frame on current user stack sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 ldr r2, IRQ_STACK_START_IN @ get values for "aborted" pc and cpsr (into parm regs) ldmia r2, {r2 - r3} add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack add r5, sp, #S_SP mov r1, lr stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr mov r0, sp @ save current stack into r0 (param register) .endm .macro irq_save_user_regs sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Calling r0-r12 @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. add r8, sp, #S_PC stmdb r8, {sp, lr}^ @ Calling SP, LR str lr, [r8, #0] @ Save calling PC mrs r6, spsr str r6, [r8, #4] @ Save CPSR str r0, [r8, #8] @ Save OLD_R0 mov r0, sp .endm .macro irq_restore_user_regs ldmia sp, {r0 - lr}^ @ Calling r0 - lr mov r0, r0 ldr lr, [sp, #S_PC] @ Get PC add sp, sp, #S_FRAME_SIZE subs pc, lr, #4 @ return & move spsr_svc into cpsr .endm .macro get_bad_stack ldr r13, IRQ_STACK_START_IN @ setup our mode stack str lr, [r13] @ save caller lr in position 0 of saved stack mrs lr, spsr @ get the spsr str lr, [r13, #4] @ save spsr in position 1 of saved stack mov r13, #MODE_SVC @ prepare SVC-Mode @ msr spsr_c, r13 msr spsr, r13 @ switch modes, make sure moves will execute mov lr, pc @ capture return pc movs pc, lr @ jump to next instruction & switch modes. .endm .macro get_irq_stack @ setup IRQ stack ldr sp, IRQ_STACK_START .endm .macro get_fiq_stack @ setup FIQ stack ldr sp, FIQ_STACK_START .endm /* * exception handlers */ .align 5 undefined_instruction: get_bad_stack bad_save_user_regs bl do_undefined_instruction .align 5 software_interrupt: get_bad_stack bad_save_user_regs bl do_software_interrupt .align 5 prefetch_abort: get_bad_stack bad_save_user_regs bl do_prefetch_abort .align 5 data_abort: get_bad_stack bad_save_user_regs bl do_data_abort .align 5 not_used: get_bad_stack bad_save_user_regs bl do_not_used #ifdef CONFIG_USE_IRQ .align 5 irq: get_irq_stack irq_save_user_regs bl do_irq irq_restore_user_regs .align 5 fiq: get_fiq_stack /* someone ought to write a more effiction fiq_save_user_regs */ irq_save_user_regs bl do_fiq irq_restore_user_regs #else .align 5 irq: get_bad_stack bad_save_user_regs bl do_irq .align 5 fiq: get_bad_stack bad_save_user_regs bl do_fiq #endif /* CONFIG_USE_IRQ */ #endif /* CONFIG_SPL_BUILD */
0x~0x1C地址定义了中断向量表，以地址0x04为例，将[pc,#20]地址的值加载到PC，也就是跳转到0x60处执行，即执行undefined_instruction中断处理程序。
3.3 reset(复位)
CPU上电后，执行第一条命令b reset。跳转到arch/arm/cpu/arm920t/start.S文件执行。
/* * armboot - Startup Code for ARM920 CPU-core * * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> * * SPDX-License-Identifier: GPL-2.0+ */ #include <asm-offsets.h> #include <common.h> #include <config.h> /* ************************************************************************* * * Startup Code (called from the ARM reset exception vector) * * do important init only if we don't start from memory! * relocate armboot to ram * setup stack * jump to second stage * ************************************************************************* */ .globl reset reset: /* * set the cpu to SVC32 mode 1. 设置为SVC模式 */ mrs r0, cpsr bic r0, r0, #0x1f orr r0, r0, #0xd3 msr cpsr, r0 #if defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK) /* * relocate exception table */ ldr r0, =_start ldr r1, =0x0 mov r2, #16 copyex: subs r2, r2, #1 ldr r3, [r0], #4 str r3, [r1], #4 bne copyex #endif #ifdef CONFIG_S3C24X0 /* turn off the watchdog */ # if defined(CONFIG_S3C2400) # define pWTCON 0x15300000 # define INTMSK 0x14400008 /* Interrupt-Controller base addresses */ # define CLKDIVN 0x14800014 /* clock divisor register */ #else # define pWTCON 0x53000000 /* 看门狗控制寄存器地址 */ # define INTMSK 0x4A000008 /* Interrupt-Controller base addresses */ # define INTSUBMSK 0x4A00001C # define CLKDIVN 0x4C000014 /* clock divisor register */ # endif ldr r0, =pWTCON /* 2. 关看门狗 */ mov r1, #0x0 str r1, [r0] /* * mask all IRQs by setting all bits in the INTMR - default */ mov r1, #0xffffffff /* 3. 屏蔽中断 */ ldr r0, =INTMSK str r1, [r0] # if defined(CONFIG_S3C2410) ldr r1, =0x3ff ldr r0, =INTSUBMSK str r1, [r0] # endif /* FCLK:HCLK:PCLK = 1:2:4 */ /* default FCLK is 120 MHz ! */ ldr r0, =CLKDIVN /* 4. 设置分频系数，未设置时钟频率 */ mov r1, #3 str r1, [r0] #endif /* CONFIG_S3C24X0 */ /* * we do sys-critical inits only at reboot, * not when booting from ram! */ #ifndef CONFIG_SKIP_LOWLEVEL_INIT bl cpu_init_crit /* 5. 跳到cpu_init_crit函数 */ #endif bl _main /* 6. 进入arch/arm/lib/crt0.S的_main函数，进行其他初始化 */ /*------------------------------------------------------------------------------*/ .globl c_runtime_cpu_setup c_runtime_cpu_setup: mov pc, lr /* ************************************************************************* * * CPU_init_critical registers * * setup important registers * setup memory timing * ************************************************************************* */ #ifndef CONFIG_SKIP_LOWLEVEL_INIT cpu_init_crit: /* * flush v4 I/D caches [1]. 清除cache */ mov r0, #0 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ /* * disable MMU stuff and caches [2]. 禁止MMU */ mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS) bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM) orr r0, r0, #0x00000002 @ set bit 1 (A) Align orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache mcr p15, 0, r0, c1, c0, 0 #ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * before relocating, we have to setup RAM timing * because memory timing is board-dependend, you will * find a lowlevel_init.S in your board directory. */ mov ip, lr bl lowlevel_init /* [3]. 进入board/samsung/smdk2410/lowlevel_init.S执行*/ /* 设置内存控制寄存器时序参数 */ mov lr, ip #endif mov pc, lr #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
我们总结以下start.S文件主要做了哪些事情：
(1) 开启SVC模式，关闭fiq、irq中断；
(2) 关闭看门狗；
(3) 屏蔽所有中断；
(4) 设置系统时钟；
(5) 执行cpu_init_crit函数；
- 关闭关闭MMU和cache；
- 执行lowlevel_init函数（board/samsung/smdk2410/lowlevel_init.S），初始化SDRAM；
(6) 执行_main（arch/arm/lib/crt0.S）；
3.4 跳转_main
这块代码也比较多，这里就一点一点的展示，并进行讲解。文件开头就是引入一些有文件
#include <config.h> #include <asm-offsets.h> #include <linux/linkage.h> #ifdef CONFIG_CPU_V7M #include <asm/armv7m.h> #endif
接着，是一堆对文件的描述：
/* * This file handles the target-independent stages of the U-Boot * start-up where a C runtime environment is needed. Its entry point * is _main and is branched into from the target's start.S file. * * _main execution sequence is: * * 1. Set up initial environment for calling board_init_f(). * This environment only provides a stack and a place to store * the GD ('global data') structure, both located in some readily * available RAM (SRAM, locked cache...). In this context, VARIABLE * global data, initialized or not (BSS), are UNAVAILABLE; only * CONSTANT initialized data are available. GD should be zeroed * before board_init_f() is called. * * 2. Call board_init_f(). This function prepares the hardware for * execution from system RAM (DRAM, DDR...) As system RAM may not * be available yet, , board_init_f() must use the current GD to * store any data which must be passed on to later stages. These * data include the relocation destination, the future stack, and * the future GD location. * * 3. Set up intermediate environment where the stack and GD are the * ones allocated by board_init_f() in system RAM, but BSS and * initialized non-const data are still not available. * * 4a.For U-Boot proper (not SPL), call relocate_code(). This function * relocates U-Boot from its current location into the relocation * destination computed by board_init_f(). * * 4b.For SPL, board_init_f() just returns (to crt0). There is no * code relocation in SPL. * * 5. Set up final environment for calling board_init_r(). This * environment has BSS (initialized to 0), initialized non-const * data (initialized to their intended value), and stack in system * RAM (for SPL moving the stack and GD into RAM is optional - see * CONFIG_SPL_STACK_R). GD has retained values set by board_init_f(). * * 6. For U-Boot proper (not SPL), some CPUs have some work left to do * at this point regarding memory, so call c_runtime_cpu_setup. * * 7. Branch to board_init_r(). * * For more information see 'Board Initialisation Flow in README. */
这里作者罗列了几条内容，这里我大致翻译一下：
(1) 函数首先设置栈，然后在栈底预留一定的内存空间给gd_t结构体并清零，用来存放全局参数， 然后调用board_init_f()；这里作者提到在当前上下文，已经初始化的全局变量（位于.data段）或者是未初始化的全局变量（位于.bss段）是无法访问到的，这主要是因为还没将代码从NAND或者NOR拷贝到SDRAM；
(2) 调用board_init_f()，这个函数调用一系列函数来初始化硬件以使程序能够在SDRAM中执行，且这个函数需要使用设置好的gd_t结构体来存放初始化中的各个参数以备后用，比如：重定位地址，重定位后的栈地址、重定位后的gd_t的地址；
(3) 由于bss段还没初始化，board_init_f()设置gd_t时不能使用全局变量、静态变量等， 所以设置的环境参数不是最终的；
(4) smdk2410.h没有定义SPL，所以会在_main()函数中根据board_init_f()设置的重定位参数进行代码重定位；
(5) 重定位后，bss和non-const data都被初始化了，在进入board_init_r()函数之前应先设置最终的环境参数；
(6) 调用board_init_r()函数；
最后，才是代码，这段代码主要就是设置C语言运行环境，并调用board_init_f跳转到C语言执行。
/* * entry point of crt0 sequence */ ENTRY(_main) /* * Set up initial C runtime environment and call board_init_f(0). */ #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK) ldr sp, =(CONFIG_SPL_STACK) // 0x1000 #else ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) //1. 设置栈 0x30000f50 #endif #if defined(CONFIG_CPU_V7M) /* v7M forbids using SP as BIC destination */ mov r3, sp bic r3, r3, #7 mov sp, r3 #else bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ #endif mov r0, sp bl board_init_f_alloc_reserve //2. 为gd_t结构体保留空间 mov sp, r0 /* set up gd here, outside any C code */ mov r9, r0 bl board_init_f_init_reserve //3. 初始化gd_t(清零) //gd_t的地址存在r9寄存器中，结构体中存放的是全局参数 mov r0, #0 bl board_init_f //4. 进入board_init_f进行各种初始化，分配SDRAM内存空间，填充进gd_t结构体中
smdk2410.h文件中没有定义SPL，所以sp设置为CONFIG_SYS_INIT_SP_ADDR，如果使用了SPL，那么sp将被设置为片内SRAM的最顶部。
#define PHYS_SDRAM_1 0x30000000 /* SDRAM Bank #1 */ #define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + 0x1000 - GENERATED_GBL_DATA_SIZE)
3.4.1 board_init_f_alloc_reserve
board_init_f_alloc_reserve函数用于从“栈顶部”地址分配保留空间，用作全局变量gd_t，并返回已分配空间的“栈底部”地址。位于common/init/board_init.c文件中：
/* * Allocate reserved space for use as 'globals' from 'top' address and * return 'bottom' address of allocated space * * Notes: * * Actual reservation cannot be done from within this function as * it requires altering the C stack pointer, so this will be done by * the caller upon return from this function. * * IMPORTANT: * * Alignment constraints may differ for each 'chunk' allocated. For now: * * - GD is aligned down on a 16-byte boundary * * - the early malloc arena is not aligned, therefore it follows the stack * alignment constraint of the architecture for which we are bulding. * * - GD is allocated last, so that the return value of this functions is * both the bottom of the reserved area and the address of GD, should * the calling context need it. */ ulong board_init_f_alloc_reserve(ulong top) { /* Reserve early malloc arena */ #if defined(CONFIG_SYS_MALLOC_F) top -= CONFIG_SYS_MALLOC_F_LEN; #endif /* LAST : reserve GD (rounded up to a multiple of 16 bytes) */ top = rounddown(top-sizeof(struct global_data), 16); return top; }
这里top传入的为sp的值，并在栈顶底预留了global_data结构体大小的数据，然后设置栈底为16字节对齐，同时将gd_t结构体的起始地址保存到r9寄存器。
DECLARE_GLOBAL_DATA_PTR定义了一个gd_t全局数据结构的指针，这个指针存放在指定的寄存器r9中。这个声明也避免了编译器把r9分配给其他的变量，任何想要访问访问全局数据区的代码，只要代码开头加DECLARE_GLOBAL_DATA_PTR一行代码，然后就可以使用gd指针来访问全局数据区了。
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
u-boot启动内核时要给内核传递参数，这时就要使用gd_t,结构体中的信息来设置标记列表。
3.4.2 board_init_f_init_reserve
board_init_f_init_reserve该函数用于初始化gd_t内存空间内容为0。
void board_init_f_init_reserve(ulong base) { struct global_data *gd_ptr; #ifndef _USE_MEMCPY int *ptr; #endif /* * clear GD entirely and set it up. * Use gd_ptr, as gd may not be properly set yet. */ gd_ptr = (struct global_data *)base; /* zero the area */ #ifdef _USE_MEMCPY memset(gd_ptr, ' ', sizeof(*gd)); #*gd大小0xa8 #else for (ptr = (int *)gd_ptr; ptr < (int *)(gd_ptr + 1); ) *ptr++ = 0; #endif /* set GD unless architecture did it already */ #if !defined(CONFIG_ARM) arch_setup_gd(gd_ptr); #endif /* next alloc will be higher by one GD plus 16-byte alignment */ base += roundup(sizeof(struct global_data), 16); /* * record early malloc arena start. * Use gd as it is now properly set for all architectures. */ #if defined(CONFIG_SYS_MALLOC_F) /* go down one 'early malloc arena' */ gd->malloc_base = base; /* next alloc will be higher by one 'early malloc arena' size */ base += CONFIG_SYS_MALLOC_F_LEN; #endif }
指定位置base作结构体gd的存放地。
四、重要头文件
在u-boot启动流程中有两个比较重要的有文件，一个是include/config.h，另一个是include/configs/smdk2410.h。
4.1 include/config.h
start.S文件的开始，#include <config.h>，config.h从哪里来的呢？在上一小节中我们已经介绍了Make在编译过程中，arm-linux-gcc指定了头文件路径：
- UBOOTINCLUDE：引入了./include、./arch/arm/include目录下的头文件、以及./include/linux/kconfig.h文件。
- PLATFORM_CPPFLAGS
至于这里写成#include<config.h>而不是#include<include/config.h>是因为arm-linux-gcc在编译的时候通过-I参数指定了搜索头文件的目录有./include：
include/config.h文件在make smdk2410_config时创建，主要包含以下信息：
/* Automatically generated - do not edit */ #define CONFIG_BOARDDIR board/samsung/smdk2410 #include <config_defaults.h> #include <config_uncmd_spl.h> #include <configs/smdk2410.h> #include <asm/config.h> #include <config_fallbacks.h>
#include <configs/smdk2410.h> 从这里可以看出在include/configs目录下，包含smdk2410.h文件，如果在board目录下新建一个开发板的目录，则在include/configs目录下要创建一个.h文件，里面存放的开发板配置信息。
#include <asm/config.h>来自arch/arm/include/asm目录：
/* * Copyright 2009 Freescale Semiconductor, Inc. * * SPDX-License-Identifier: GPL-2.0+ */ #ifndef _ASM_CONFIG_H_ #define _ASM_CONFIG_H_ #define CONFIG_LMB #define CONFIG_SYS_BOOT_RAMDISK_HIGH #ifdef CONFIG_ARM64 #define CONFIG_PHYS_64BIT #define CONFIG_STATIC_RELA #endif #if defined(CONFIG_LS102XA) || defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS) || defined(CONFIG_CPU_PXA25X) || defined(CONFIG_FSL_LAYERSCAPE) #include <asm/arch/config.h> #endif #endif
4.2 include/configs/smdk2410.h
这个文件很重要，这里主要用来配置编译u-boot时是否启用某些功能，比如网卡，LCD等，如果定义了，那么将会编译相关模块的代码。
/* * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Marius Groeger <mgroeger@sysgo.de> * Gary Jennejohn <garyj@denx.de> * David Mueller <d.mueller@elsoft.ch> * * Configuation settings for the SAMSUNG SMDK2410 board. * * SPDX-License-Identifier: GPL-2.0+ */ #ifndef __CONFIG_H #define __CONFIG_H /* * High Level Configuration Options * (easy to change) */ #define CONFIG_S3C24X0 /* This is a SAMSUNG S3C24x0-type SoC */ #define CONFIG_S3C2410 /* specifically a SAMSUNG S3C2410 SoC */ #define CONFIG_SMDK2410 /* on a SAMSUNG SMDK2410 Board */ #define CONFIG_SYS_TEXT_BASE 0x0 #define CONFIG_SYS_ARM_CACHE_WRITETHROUGH /* input clock of PLL (the SMDK2410 has 12MHz input clock) */ #define CONFIG_SYS_CLK_FREQ 12000000 #define CONFIG_CMDLINE_TAG /* enable passing of ATAGs */ #define CONFIG_SETUP_MEMORY_TAGS #define CONFIG_INITRD_TAG /* * Hardware drivers */ #define CONFIG_CS8900 /* we have a CS8900 on-board */ #define CONFIG_CS8900_BASE 0x19000300 #define CONFIG_CS8900_BUS16 /* the Linux driver does accesses as shorts */ /* * select serial console configuration */ #define CONFIG_S3C24X0_SERIAL #define CONFIG_SERIAL1 1 /* we use SERIAL 1 on SMDK2410 */ /************************************************************ * USB support (currently only works with D-cache off) ************************************************************/ #define CONFIG_USB_OHCI #define CONFIG_USB_OHCI_S3C24XX #define CONFIG_USB_KEYBOARD #define CONFIG_USB_STORAGE #define CONFIG_DOS_PARTITION /************************************************************ * RTC ************************************************************/ #define CONFIG_RTC_S3C24X0 #define CONFIG_BAUDRATE 115200 /* * BOOTP options */ #define CONFIG_BOOTP_BOOTFILESIZE #define CONFIG_BOOTP_BOOTPATH #define CONFIG_BOOTP_GATEWAY #define CONFIG_BOOTP_HOSTNAME /* * Command line configuration. */ #define CONFIG_CMD_BSP #define CONFIG_CMD_DATE #define CONFIG_CMD_NAND #define CONFIG_CMD_REGINFO #define CONFIG_CMDLINE_EDITING /* autoboot */ #define CONFIG_BOOTDELAY 5 #define CONFIG_BOOT_RETRY_TIME -1 #define CONFIG_RESET_TO_RETRY #define CONFIG_ZERO_BOOTDELAY_CHECK #define CONFIG_NETMASK 255.255.255.0 #define CONFIG_IPADDR 10.0.0.110 #define CONFIG_SERVERIP 10.0.0.1 #if defined(CONFIG_CMD_KGDB) #define CONFIG_KGDB_BAUDRATE 115200 /* speed to run kgdb serial port */ #endif /* * Miscellaneous configurable options */ #define CONFIG_SYS_LONGHELP /* undef to save memory */ #define CONFIG_SYS_CBSIZE 256 /* Print Buffer Size */ #define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT)+16) #define CONFIG_SYS_MAXARGS 16 #define CONFIG_SYS_BARGSIZE CONFIG_SYS_CBSIZE #define CONFIG_DISPLAY_CPUINFO /* Display cpu info */ #define CONFIG_SYS_MEMTEST_START 0x30000000 /* memtest works on */ #define CONFIG_SYS_MEMTEST_END 0x33F00000 /* 63 MB in DRAM */ #define CONFIG_SYS_LOAD_ADDR 0x30800000 /* support additional compression methods */ #define CONFIG_BZIP2 #define CONFIG_LZO #define CONFIG_LZMA /*----------------------------------------------------------------------- * Physical Memory Map */ #define CONFIG_NR_DRAM_BANKS 1 /* we have 1 bank of DRAM */ #define PHYS_SDRAM_1 0x30000000 /* SDRAM Bank #1 */ #define PHYS_SDRAM_1_SIZE 0x04000000 /* 64 MB */ #define PHYS_FLASH_1 0x00000000 /* Flash Bank #0 */ #define CONFIG_SYS_FLASH_BASE PHYS_FLASH_1 /*----------------------------------------------------------------------- * FLASH and environment organization */ #define CONFIG_SYS_FLASH_CFI #define CONFIG_FLASH_CFI_DRIVER #define CONFIG_FLASH_CFI_LEGACY #define CONFIG_SYS_FLASH_LEGACY_512Kx16 #define CONFIG_FLASH_SHOW_PROGRESS 45 #define CONFIG_SYS_MAX_FLASH_BANKS 1 #define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE } #define CONFIG_SYS_MAX_FLASH_SECT (19) #define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000) #define CONFIG_ENV_IS_IN_FLASH #define CONFIG_ENV_SIZE 0x10000 /* allow to overwrite serial and ethaddr */ #define CONFIG_ENV_OVERWRITE /* * Size of malloc() pool * BZIP2 / LZO / LZMA need a lot of RAM */ #define CONFIG_SYS_MALLOC_LEN (4 * 1024 * 1024) #define CONFIG_SYS_MONITOR_LEN (448 * 1024) #define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_FLASH_BASE /* * NAND configuration */ #ifdef CONFIG_CMD_NAND #define CONFIG_NAND_S3C2410 #define CONFIG_SYS_S3C2410_NAND_HWECC #define CONFIG_SYS_MAX_NAND_DEVICE 1 #define CONFIG_SYS_NAND_BASE 0x4E000000 #endif /* * File system */ #define CONFIG_CMD_UBI #define CONFIG_CMD_UBIFS #define CONFIG_CMD_MTDPARTS #define CONFIG_MTD_DEVICE #define CONFIG_MTD_PARTITIONS #define CONFIG_YAFFS2 #define CONFIG_RBTREE /* additions for new relocation code, must be added to all boards */ #define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + 0x1000 - GENERATED_GBL_DATA_SIZE) #define CONFIG_BOARD_EARLY_INIT_F #endif /* __CONFIG_H */
4.3 宏定义查找总结
我们在阅读源代码的时候，判断一个宏有没有定义，我们重点关注以下两个文件，具体可以参考2.4节分析：
- include/generated/autoconf.h；
-
include/configs/smdk2410.h;
参考文章：
[1]U-BOOT-2016.07移植 (第一篇) 初步分析
[3]从零开始之uboot、移植uboot2017.01（五、board_init_f分析）
[4]u-boot2020.04移植（4、board_init_f）
[5]U-boot源码阅读-使用u-boot.map定位函数位置
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