uboot 中 mkconfig 分析

tancotq

对于
mini2440_config :       unconfig
        @$(MKCONFIG) $(@:_config=) arm arm920t mini2440 NULL s3c24x0
实际执行:
./mkconfig mini2440 arm arm920t mini2440 NULL s3c24x0

以下分析mkconfig作用:
1. 确定开发板名称
11 APPEND=no       # Default: Create new config file
12 BOARD_NAME=""   # Name to print in make output
13
14 while [ $# -gt 0 ] ; do
15         case "$1" in
16         --) shift ; break ;;
17         -a) shift ; APPEND=yes ;;
18         -n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
19         *)  break ;;
20         esac
21 done
22
23 [ "${BOARD_NAME}" ] || BOARD_NAME="$1"
$1 = mini2440, 参数中没有 -a, -n 等参数,所以14-21行没有执行.
BOARD_NAME = mini2440
2.创建发平台/开板头文件连接

30 #
31 # Create link to architecture specific headers
32 #
33 if [ "$SRCTREE" != "$OBJTREE" ] ; then
34         mkdir -p ${OBJTREE}/include
35         mkdir -p ${OBJTREE}/include2
36         cd ${OBJTREE}/include2
37         rm -f asm
38         ln -s ${SRCTREE}/include/asm-$2 asm
39         LNPREFIX="../../include2/asm/"
40         cd ../include
41         rm -rf asm-$2
42         rm -f asm
43         mkdir asm-$2
44         ln -s asm-$2 asm
45 else
46         cd ./include
47         rm -f asm
48         ln -s asm-$2 asm
49 fi
if [ "$SRCTREE" != "$OBJTREE" ] 判断源代码与目标文件目录是否一样，否则删除
/include/asm ,建立asm 连接到asm-arm.
51 rm -f asm-$2/arch
52
53 if [ -z "$6" -o "$6" = "NULL" ] ; then
54         ln -s ${LNPREFIX}arch-$3 asm-$2/arch
55 else
56         ln -s ${LNPREFIX}arch-$6 asm-$2/arch
57 fi
58
59 if [ "$2" = "arm" ] ; then
60         rm -f asm-$2/proc
61         ln -s ${LNPREFIX}proc-armv asm-$2/proc
62 fi
执行ln -s arch-s3c24x0 asm-arm-arch, ln -s proc-armv asm-arm/proc
3.创建顶层Makefile 包含的头文件include/config.mk
65 # Create include file for Make
66 #
67 echo "ARCH   = $2" >  config.mk
68 echo "CPU    = $3" >> config.mk
69 echo "BOARD  = $4" >> config.mk
70
71 [ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk
72
73 [ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk
执行后config.mk 内容如下：
ARCH = arm, CPU = arm920t, BOADR = mini2440, SOC = s3c24x0

# Create board specific header file
77 #
78 if [ "$APPEND" = "yes" ]        # Append to existing config file
79 then
80         echo >> config.h
81 else
82         > config.h              # Create new config file
83 fi
84 echo "/* Automatically generated - do not edit */" >>config.h
85 echo "#include " >>config.h
执行后config内容如下：
/* Automatically generated - do not edit */
#include



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