/**************************************************************************** * I.MX6 U-Boot mkconfig hacking * 声明： * 本文主要是为了知道U-Boot中的mkconfig是如何工作的，是如何将配置 * 中的内容进行汇总，同时又将这些内容放在了什么地方。 * * 2015-12-19 深圳 南山区平山村 曾剑锋 ***************************************************************************/ \\\\\\\\\-*- 目录 -*-////////// | 一、参考文档： | 二、Makefile | 三、mkconfig | 四、include/config.h | 五、include/config.mk ------------------------------ 一、参考文档： 1. $(@:_config=)什么意思？ http://blog.csdn.net/zbffff/article/details/18991145 2. U-BOOT Makefile注释 http://wenku.baidu.com/view/ff14f319227916888486d7cb.html 3. makefile中的@ http://www.cnblogs.com/lihaiping/archive/2013/03/20/makefile.html 4. Makefile中常用的函数 http://linux.chinaunix.net/techdoc/develop/2009/07/09/1122854.shtml 5. U-Boot移植（二）——U-Boot编译过程分析（2） http://blog.csdn.net/wafx1314/article/details/11260041 6. 请教linux make make clean make all 的具体用法 http://zhidao.baidu.com/question/129692720.html 二、Makefile ...... SRCTREE := $(CURDIR) ...... MKCONFIG := $(SRCTREE)/mkconfig export MKCONFIG ...... mx6solo_sabresd_config \ mx6solo_sabresd_mfg_config \ mx6solo_sabresd_android_config \ mx6dl_sabresd_config \ mx6dl_sabresd_mfg_config \ mx6dl_sabresd_android_config \ mx6q_sabresd_config \ mx6q_sabresd_android_config \ mx6q_sabresd_mfg_config \ mx6q_sabresd_iram_config : unconfig @[ -z "$(findstring iram_,$@)" ] || \ { echo "TEXT_BASE = 0x00907000" >$(obj)board/freescale/mx6q_sabresd/config.tmp ; \ echo "... with iram configuration" ; \ } @$(MKCONFIG) $(@:_config=) arm arm_cortexa8 mx6q_sabresd freescale mx6 ...... 三、mkconfig #!/bin/sh -e # Script to create header files and links to configure # U-Boot for a specific board. # # Parameters: Target Architecture CPU Board [VENDOR] [SOC] # # (C) 2002-2006 DENX Software Engineering, Wolfgang Denk <wd@denx.de> # APPEND=no # Default: Create new config file # 开发板的名字 BOARD_NAME="" # Name to print in make output # 使用while循环和case进行命令行参数提取，很不错的处理方式 while [ $# -gt 0 ] ; do case "$1" in --) shift ; break ;; -a) shift ; APPEND=yes ;; -n) shift ; BOARD_NAME="${1%%_config}" ; shift ;; # %%去除$1字符串中的_config *) break ;; esac done # 如果上面的命令行参数都没有，那么$1就是开发板的名字 [ "${BOARD_NAME}" ] || BOARD_NAME="$1" # 参数个数小于4个或者大于6个，直接退出，比较奇怪的是，为什么不放在前面进行判断呢 [ $# -lt 4 ] && exit 1 [ $# -gt 6 ] && exit 1 # 显示提示信息 echo "Configuring for ${BOARD_NAME} board..." # # Create link to architecture specific headers # # 如果编译出来的目录和源代码目录不一样，那么执行以下内容 if [ "$SRCTREE" != "$OBJTREE" ] ; then mkdir -p ${OBJTREE}/include # 创建include目录 mkdir -p ${OBJTREE}/include2 # 创建include2目录 cd ${OBJTREE}/include2 # 进入include2目录 rm -f asm # 防止asm已经存在 ln -s ${SRCTREE}/include/asm-$2 asm # 重新软链接到固定的位置$2(arm)平台 LNPREFIX="../../include2/asm/" cd ../include rm -rf asm-$2 rm -f asm mkdir asm-$2 ln -s asm-$2 asm else cd ./include rm -f asm ln -s asm-$2 asm # $2=arm fi # 删除include/asm-arm/arch这个软链接 rm -f asm-$2/arch # $6等于mx6 if [ -z "$6" -o "$6" = "NULL" ] ; then ln -s ${LNPREFIX}arch-$3 asm-$2/arch else ln -s ${LNPREFIX}arch-$6 asm-$2/arch fi if [ "$2" = "arm" ] ; then rm -f asm-$2/proc ln -s ${LNPREFIX}proc-armv asm-$2/proc fi # # Create include file for Make # echo "ARCH = $2" > config.mk # $2=arm echo "CPU = $3" >> config.mk # $3=arm_cortexa8 echo "BOARD = $4" >> config.mk # $4=mx6q_sabresd # $5=freescale [ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk # $6=mx6 [ "$6" ] && [ "$6" != "NULL" ] && echo "SOC = $6" >> config.mk # # Create board specific header file # APPEND=no if [ "$APPEND" = "yes" ] # Append to existing config file then echo >> config.h else > config.h # Create new config file fi # 原来我们可以在在这个文件里查看config文件 echo "/* Automatically generated - do not edit */" >>config.h # $1=mx6dl_sabresd_android echo "#include <configs/$1.h>" >>config.h echo "#include <asm/config.h>" >>config.h exit 0 四、include/config.h /* Automatically generated - do not edit */ #include <configs/mx6dl_sabresd_android.h> #include <asm/config.h> 五、include/config.mk ARCH = arm CPU = arm_cortexa8 BOARD = mx6q_sabresd VENDOR = freescale SOC = mx6 六、总结： 从上面的情况可知，如果要在board目录下新建一个开发板<board_name>目录，则在include/configs目录下也要建立一个对应的<board_name>文件，里面存放的就是开发板<board_name>的配置信息。这里目前没有验证。
