AR init/mounts.o
arm-linux-ar: illegal option -- T
Usage: arm-linux-ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] [count] archive-file file...
arm-linux-ar -M [<mri-script]
commands:
d - delete file(s) from the archive
m[ab] - move file(s) in the archive
p - print file(s) found in the archive
q[f] - quick append file(s) to the archive
r[ab][f][u] - replace existing or insert new file(s) into the archive
t - display contents of archive
x[o] - extract file(s) from the archive
command specific modifiers:
[a] - put file(s) after [member-name]
[b] - put file(s) before [member-name] (same as [i])
[N] - use instance [count] of name
[f] - truncate inserted file names
[P] - use full path names when matching
[o] - preserve original dates
[u] - only replace files that are newer than current archive contents
generic modifiers:
[c] - do not warn if the library had to be created
[s] - create an archive index (cf. ranlib)
[S] - do not build a symbol table
[v] - be verbose
[V] - display the version number
@<file> - read options from <file>
emulation options:
No emulation specific options
arm-linux-ar: supported targets: elf32-littlearm elf32-bigarm elf32-little elf32-big srec symbolsrec tekhex binary ihex
scripts/Makefile.build:: recipe for target 'init/mounts.o' failed
make[]: *** [init/mounts.o] Error
Makefile:: recipe for target 'init' failed
make: *** [init] Error
这个问题一时不知道怎么查，于是各种百度，但几乎没人遇到这种问题，于是第一反应想到的是工具链的问题，于是换了arm-linux-gcc4.4.3的版本，可以直接去友善之臂的官网下载：http://www.arm9.net/download.asp
换成了4.4.3的工具链却报下面的问题：
error while loading shared libraries: libstdc++.so.: cannot open shared object file: No such file or directory
于是安装库：
sudo apt-get install lib32stdc++
sudo apt-get install lib32z1
终于编过了，看到希望了，但最后还是报了一个错误：
"mkimage" command not found - U-Boot images will not be built
arch/arm/boot/Makefile:: recipe for target 'arch/arm/boot/uImage' failed
make[]: *** [arch/arm/boot/uImage] Error
arch/arm/Makefile:: recipe for target 'uImage' failed
make: *** [uImage] Error
其实这个问题很好解决，mkimage这个工具在编译uboot的时候就会产生，在uboot/tools/目录下，所以只需要将这个目录加到环境变量里面去即可。