[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)' )>> $@.tmp
@( printf '#define LD_VERSION_STRING "%s"\n' \
'$(shell $(LD) -v | head -n 1)' )>> $@.tmp
@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@