make[1]: *** No rule to make target

每次重启linux后编译uboot就出现这个问题，烦死了.
make[1]: Entering directory `/home/u-boot-2009.11/tools'
make[1]: Nothing to be done for `_depend'.
make[1]: Leaving directory `/home/u-boot-2009.11/tools'
make[1]: Entering directory `/home/u-boot-2009.11/examples/standalone'
make[1]: Nothing to be done for `_depend'.
make[1]: Leaving directory `/home/u-boot-2009.11/examples/standalone'
make[1]: Entering directory `/home/u-boot-2009.11/examples/api'
make[1]: Nothing to be done for `_depend'.
make[1]: Leaving directory `/home/u-boot-2009.11/examples/api'
make -C tools all
make[1]: Entering directory `/home/u-boot-2009.11/tools'
make[1]: *** No rule to make target `/home/book/u-boot-2009.11.a/lib_generic/crc32.c', needed by `crc32.o'.  Stop.
make[1]: Leaving directory `/home/u-boot-2009.11/tools'
make: *** [tools] Error 2
有谁遇到过这个问题的么？

信息太少

我把uboot源文件中的Makefile文件复制过来重新改了一遍，问题就解决了，但电脑一重启，又出现这个问题，不知道怎么解决。