u-boot中的version命令

[Author: Bo Shen voice.shen@gmail.com]

1. Source Code

<common/cmd_version.c>

2. Usage

U-Boot > help version

version – print monitor version

U-boot > version

U-Boot 2013.04-00085-g5ed6f44

3. Source code go through

const char __weak version_string[] = U_BOOT_VERSION_STRING;

static int do_version(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
 printf(“\n%s\n”, version_string);
#ifdef CC_VERSION_STRING
 puts(CC_VERSION_STRING “\n”);
#endif
#ifdef LD_VERSION_STRING
 puts(LD_VERSION_STRING “\n”);
#endif
#ifdef CONFIG_SYS_COREBOOT
 printf(“coreboot-%s (%s)\n”, lib_sysinfo.version, lib_sysinfo.build);
#endif
 return 0;
}

其中，U_BOOT_VERSION_STRING在<include/version.h>

定义：#define U_BOOT_VERSION_STRING U_BOOT_VERSION ” (” U_BOOT_DATE ” – ” \
        U_BOOT_TIME “)” CONFIG_IDENT_STRING

U_BOOT_VERSION, CC_VERSION_STRING, LD_VERSION_STRING: 定义在<include/generated/version_autogenerated.h>此文件通过名字可以看出是自动生成的。其具体生成代码在顶层目录中的Makefile里面。代码如下：

$(VERSION_FILE):
                @mkdir -p $(dir $(VERSION_FILE))
                @( localvers=’$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))’ ; \
                  printf ‘#define PLAIN_VERSION “%s%s”\n’ \
                        “$(U_BOOT_VERSION)” “$${localvers}” ; \
                  printf ‘#define U_BOOT_VERSION “U-Boot %s%s”\n’ \
                        “$(U_BOOT_VERSION)” “$${localvers}” ; \
                ) > $@.tmp
                @( printf ‘#define CC_VERSION_STRING “%s”\n’ \
                ‘$(shell $(CC) –version | head -n 1)’ )>>  $@.tmp
                @( printf ‘#define LD_VERSION_STRING “%s