一步步写嵌入式操作系统 linux平台实现代码

step 0 准备开发环境 1 安装交叉编译工具 sudo apt-get install gcc-arm-none-eabi sudo apt-get install gcc-arm-linux-gnueabihf sudo apt-get install g++-arm-linux-gnueabihf

2 手边编译skyeye 用apt命令安装的skyeye模拟器版本（1.2.5）有bug,需要手动编译更高版本的skyeye

下载并解压skyeye 1.2.6_rc1的代码， ~/Downloads/skyeye-1.2.6_rc1 根据执行skyeye-1.2.6_rc1/INSTALL的说明 1 执行 ./configure 2 执行 make 后 编译错误1： In file included from /usr/include/fcntl.h:289:0, from nandflash/nandflash_smallblock.c:19: In function ‘open’, inlined from ‘nandflash_sb_setup’ at nandflash/nandflash_smallblock.c:519:24: /usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:4: error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments __open_missing_mode ();

解决方法： 修改skyeye-1.2.6_rc1/device/nandflash/nandflash_smallblock.c 519行 if ((nf->fdump= open(dev->dump, FILE_FLAG)) < 0) 改为： if ((nf->fdump= open(dev->dump, FILE_FLAG, 0777)) < 0)

编译错误2： gcc -g -O2 -o skyeye skyeye.o ./utils/libutils.a ./arch/arm/libarm.a ./device/libdev.a ./arch/mips/libmips.a ./arch/ppc/libppc.a ./arch/bfin/libbfin.a ./arch/mips/libmips.a ./arch/coldfire/libcoldfire.a -lc ./utils/libutils.a -lbfd -lm -lc ./arch/mips/libmips.a(decoder.o)：在函数‘decode’中： /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1079：对‘sign_extend_UInt32’未定义的引用 /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1105：对‘sign_extend_UInt32’未定义的引用 /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1049：对‘sign_extend_UInt32’未定义的引用 /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1027：对‘sign_extend_UInt32’未定义的引用 /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1013：对‘sign_extend_UInt32’未定义的引用 ./arch/mips/libmips.a(decoder.o):/home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:1001: 跟着更多未定义的参考到 sign_extend_UInt32 ./arch/mips/libmips.a(decoder.o)：在函数‘decode’中： /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:240：对‘divide_UInt32’未定义的引用 /home/kolya/Downloads/skyeye-1.2.6_rc1/arch/mips/common/decoder.c:231：对‘divide_Int32’未定义的引用 collect2: error: ld returned 1 exit status Makefile:305: recipe for target 'skyeye' failed make[2]: *** [skyeye] Error 1 make[2]: Leaving directory '/home/kolya/Downloads/skyeye-1.2.6_rc1' Makefile:351: recipe for target 'all-recursive' failed make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory '/home/kolya/Downloads/skyeye-1.2.6_rc1' Makefile:227: recipe for target 'all' failed 解决方法： 修改skyeye-1.2.6_rc1/arch/mips/common/decoder.c文件： 添加函数 UInt32 sign_extend_UInt32(UInt32 x, int s) { return x + s; }

skyeye-1.2.6_rc1/arch/mips/common/decoder.c:231行 注释掉divide_Int32(x, y); skyeye-1.2.6_rc1/arch/mips/common/decoder.c:240行 注释掉divide_UInt32(x, y);

之后重新make即可编译出skyeye