Merge pull request #2 from wb0330/master

Fix指定BUILD_DIR时编译错误
Cmd go boot the kernel
Update log
Update log
Update log
HOWTO Boot kernel and mount nfs rootfs
HOWTO Boot kernel and mount nfs rootfs
HOWTO Boot kernel and mount nfs rootfs
HOWTO Boot kernel and mount nfs rootfs
HOWTO Boot kernel and mount nfs rootfs
Merge pull request #2 from kangear/master

sync