1、默认make uImage会出错，出错如下

scripts/mod/sumversion.c: In function ‘get_src_version’: scripts/mod/sumversion.c:384: error: ‘PATH_MAX’ undeclared (first use in this function) scripts/mod/sumversion.c:384: error: (Each undeclared identifier is reported only once scripts/mod/sumversion.c:384: error: for each function it appears in.) scripts/mod/sumversion.c:384: warning: unused variable ‘filelist’ make[3]: *** [scripts/mod/sumversion.o] Error 1 make[2]: *** [scripts/mod] Error 2 make[1]: *** [scripts] Error 2 make[1]: Leaving directory `/home/nios2/uClinux-dist/linux-2.6.x' make: *** [linux] Error 1

解决方法：

# vi scripts/mod/sumversion.c

头文件包含中查看是否有limits.h，若没有，包含进去即可

#include <limits.h>

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在测试的过程中发现u-boot经常提示:

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后来换了个uboot（2009-11）版本，发现超时修改的地方变了，在drivers/net/macb.c里。