u-boot Makefile -- make xxx_config
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[Author: Bo Shen <voice.shen@gmail.com>]
[u-boot: 2014.01-rc1]
当我们执行:make xxx_config, 其做了什么工作呢?下面具体分析:
举例:make sama5d3xek_nandflash_config
764 #########################################################################765 766 unconfig:767 @rm -f $(obj)include/config.h $(obj)include/config.mk \768 $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \769 $(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep \770 $(obj)include/spl-autoconf.mk \771 $(obj)include/tpl-autoconf.mk772 773 %_config:: unconfig774 @$(MKCONFIG) -A $(@:_config=)
773:make程序会进行通配,执行此行。首先进行unconfig操作。进行一些文件删除。
774:$(MKCONFIG)是在109@Makefile赋值。"MKCONFIG := $(SRCTREE)/mkconfig" 其相当于执行:mkconfig -A sama5d3xek_nandflash
注:$(@:_config=) 的作用就是将sama5d3xek_nandflash_config中的_config用空替换。
下面具体分析mkconfig -A samad3xek_nand做了什么工作。
mkconfig是一个shell脚本。
24 if [ \( $# -eq 2 \) -a \( "$1" = "-A" \) ] ; then 25 # Automatic mode 26 line=`awk '($0 !~ /^#/ && $7 ~ /^'"$2"'$/) { print $1, $2, $3, $4, $5, $6, $7, $8 }' boards.cfg` 27 if [ -z "$line" ] ; then 28 echo "make: *** No rule to make target \`$2_config'. Stop." >&2 29 exit 1 30 fi 31 32 set ${line} 33 # add default board name if needed 34 [ $# = 3 ] && set ${line} ${1} 35 fi24: 判断mkconfig的参数个数是否为2,并且第一个参数为“-A”。在此例子中,参数个数为2, 并且第一个参数为“-A”,所以条件成立,执行下面代码。
26:通过awk命令从boards.cfg文件中查找第二个参数,如果找到打印1~8参数(空格区分),最后赋值给line变量。
line=Active arm armv7 at91 atmel sama5d3xek sama5d3xek_nandflash sama5d3xek:SAMA5D3,SYS_USE_NANDFLASH
32:通过set命令,设置mkconfig新的参数。
34:判断$#(参数个数)是否为3, 如果是,set ${line} ${1}
37 while [ $# -gt 0 ] ; do 38 case "$1" in 39 --) shift ; break ;; 40 -a) shift ; APPEND=yes ;; 41 -n) shift ; BOARD_NAME="${7%_config}" ; shift ;; 42 -t) shift ; TARGETS="`echo $1 | sed 's:_: :g'` ${TARGETS}" ; shift ;; 43 *) break ;; 44 esac 45 done
47 [ $# -lt 7 ] && exit 1 48 [ $# -gt 8 ] && exit 1如果,参数个数小于7或者大于8则都退出。即参数个数只能是7或者8.
55 arch="$2" 56 cpu=`echo $3 | awk 'BEGIN {FS = ":"} ; {print $1}'` 57 spl_cpu=`echo $3 | awk 'BEGIN {FS = ":"} ; {print $2}'` 58 if [ "$6" = "-" ] ; then 59 board=${BOARD_NAME} 60 else 61 board="$6" 62 fi 63 [ "$5" != "-" ] && vendor="$5" 64 [ "$4" != "-" ] && soc="$4" 65 [ $# -gt 7 ] && [ "$8" != "-" ] && { 66 # check if we have a board config name in the options field 67 # the options field mave have a board config name and a list 68 # of options, both separated by a colon (':'); the options are 69 # separated by commas (','). 70 # 71 # Check for board name 72 tmp="${8%:*}" 73 if [ "$tmp" ] ; then 74 CONFIG_NAME="$tmp" 75 fi 76 # Check if we only have a colon... 77 if [ "${tmp}" != "$8" ] ; then 78 options=${8#*:} 79 TARGETS="`echo ${options} | sed 's:,: :g'` ${TARGETS}" 80 f55: arch=$2 (在这个例子中,为: arm)
56: cpu=armv7
57: spl_cpu=NULL
58~62: 判断$6是否为“-", 不是则用$6 (sama5d3xek)
63: vendor=atmel
64: soc=at91
65~81: 分析参数8.
创建config.mk文件。
123 #124 # Create include file for Make125 #126 ( echo "ARCH = ${arch}"127 if [ ! -z "$spl_cpu" ] ; then128 echo 'ifeq ($(CONFIG_SPL_BUILD),y)'129 echo "CPU = ${spl_cpu}"130 echo "else"131 echo "CPU = ${cpu}"132 echo "endif"133 else134 echo "CPU = ${cpu}"135 fi136 echo "BOARD = ${board}"137 138 [ "${vendor}" ] && echo "VENDOR = ${vendor}"139 [ "${soc}" ] && echo "SOC = ${soc}"140 exit 0 ) > config.mk
创建config.h文件
149 #150 # Create board specific header file151 #152 if [ "$APPEND" = "yes" ] # Append to existing config file153 then154 echo >> config.h155 else156 > config.h # Create new config file157 fi158 echo "/* Automatically generated - do not edit */" >>config.h159 160 for i in ${TARGETS} ; do161 i="`echo ${i} | sed '/=/ {s/=/ /;q; } ; { s/$/ 1/; }'`"162 echo "#define CONFIG_${i}" >>config.h ;163 done164 165 echo "#define CONFIG_SYS_ARCH \"${arch}\"" >> config.h166 echo "#define CONFIG_SYS_CPU \"${cpu}\"" >> config.h167 echo "#define CONFIG_SYS_BOARD \"${board}\"" >> config.h168 169 [ "${vendor}" ] && echo "#define CONFIG_SYS_VENDOR \"${vendor}\"" >> config.h170 171 [ "${soc}" ] && echo "#define CONFIG_SYS_SOC \"${soc}\"" >> config.h172 173 cat << EOF >> config.h174 #define CONFIG_BOARDDIR board/$BOARDDIR175 #include <config_cmd_defaults.h>176 #include <config_defaults.h>177 #include <configs/${CONFIG_NAME}.h>178 #include <asm/config.h>179 #include <config_fallbacks.h>180 #include <config_uncmd_spl.h>181 EOF
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