在
http://wiki.ok-labs.com/Microkernel
下载
arm-linux-gnueabi-4.2.4.tar.gz，sdk-xscale-3.0.tar.gz，Skyeye 1.2.1n和skyeye.conf，并按照tut-sdk-singlecell.pdf来操作, 并把
export PATH=$PATH:`pwd`/arm-unknown-linux-gnueabi/bin
加入到PATH环境变量中。
进入singlecell目录，执行make命令，得到如下错误：
make -C hello KERNEL=micro BUILD=debug
make[1]: 进入目录“/home/xuzhina/Downloads/singlecell/hello”
cp hello.xml.in build.micro-debug/bin/hello.xml
make[1]: arm-unknown-linux-gnueabi-gcc：命令未找到
arm-unknown-linux-gnueabi-ld -o build.micro-debug/bin/hello -Ttext=0x80000000 -L/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs
/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/crt0.o build.micro-debug/src/hello.o
--start-group /home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/libc.a
/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/libokl4.a --end-group
make[1]: arm-unknown-linux-gnueabi-ld：命令未找到
make[1]: *** [build.micro-debug/bin/hello] 错误 127
make[1]: 离开目录“/home/xuzhina/Downloads/singlecell/hello”
make: *** [hello/build.micro-debug/bin/hello.xml] 错误 2
很奇怪，怎么会找不到呢？执行一下
arm-unknown-linux-gnueabi
并按TAB键，出现这样的结果：
[xuzhina@localhost singlecell]$ arm-unknown-linux-gnueabi-
arm-unknown-linux-gnueabi-addr2line arm-unknown-linux-gnueabi-gprof
arm-unknown-linux-gnueabi-ar arm-unknown-linux-gnueabi-ld
arm-unknown-linux-gnueabi-as arm-unknown-linux-gnueabi-nm
arm-unknown-linux-gnueabi-c++ arm-unknown-linux-gnueabi-objcopy
arm-unknown-linux-gnueabi-c++filt arm-unknown-linux-gnueabi-objdump
arm-unknown-linux-gnueabi-cpp arm-unknown-linux-gnueabi-ranlib
arm-unknown-linux-gnueabi-g++ arm-unknown-linux-gnueabi-readelf
arm-unknown-linux-gnueabi-gcc arm-unknown-linux-gnueabi-size
arm-unknown-linux-gnueabi-gcc-4.2.4 arm-unknown-linux-gnueabi-strings
arm-unknown-linux-gnueabi-gccbug arm-unknown-linux-gnueabi-strip
arm-unknown-linux-gnueabi-gcov
也就是说，命令是可以找到，为什么找不到呢？
把上面的错误信息中一条命令拷贝出来执行一下，
arm-unknown-linux-gnueabi-ld -o build.micro-debug/bin/hello -Ttext=0x80000000 -L/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs
/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/crt0.o build.micro-debug/src/hello.o
--start-group /home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/libc.a
/home/xuzhina/Downloads/sdk/okl4/xscale/micro-debug/libs/libokl4.a --end-group
出现这样的错误信息：
bash: /home/xuzhina/Downloads/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ld: /lib/ld-linux.so.2: bad ELF interpreter: 没有那个文件或目录
一般来说，程序执行，要先由加载器把它加载到内存里，创建了进程空间，才能够执行的。从上面错误，可以看到是没有加载器，所以无法解析这个可执行文件
那为什么其它程序可以执行，比如/bin/ls?
先看一下arm-unknown-linux-gnueabi-ld和/bin/ls的类型：
[xuzhina@localhost singlecell]$ file /home/xuzhina/Downloads/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ld
/home/xuzhina/Downloads/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ld: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, not stripped
[xuzhina@localhost singlecell]$ file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=0xec333a104e04