[u-boot: v2013.04]
[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 $@