1.make[2]: warning: Clock skew detected. Your build may be incomplete.
make[1]: warning: Clock skew detected. Your build may be incomplete.
make: Warning: File `/opt/home/wzj/wingtech_4/s3c-linux-2.6.21/arch/arm/Makefile' has modification time 8.1e+07 s in the future
make[1]: Warning: File `/opt/home/wzj/wingtech_4/s3c-linux-2.6.21/arch/arm/Makefile' has modification time 8.1e+07 s in the future
make[2]: Warning: File `scripts/Makefile.host' has modification time 7.6e+07 s in the future
HOSTCC scripts/basic/fixdep
编译在这里死循环了2个多小时，后来发现是由于服务器时间是2005年，而文件时间是2008年。所以它就过不去。
改了系统时间就OK了。
2.drivers/built-in.o: In function `init_hwif_amd74xx':
/home/wzj/wingtech_4/s3c-linux-2.6.21/drivers/ide/pci/amd74xx.c:422: undefined reference to `pci_get_legacy_ide_irq'
make: *** [.tmp_vmlinux1] Error 1
这个应该是make menuconfig里配置，关掉了相关选项就好了
第一个问题是值得注意的。
