关于开发板NFS和内核编译问题

[img=889,518]http://ww3.sinaimg.cn/large/005yyi5Jjw1en8ehzcvugj30op0eegqb.jpg[/img]
本人最近在研究一套基于HI3515的开发板，板子见上图。我用了商家提供的系统内核，在使用NFS功能时提示出错。出错信息如下：
BusyBox v1.1.2 (2010.03.16-02:37+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

Welcome to HiLinux.
None of nfsroot found in cmdline.
~ $ modprobe nfs
insmod: cannot open module `/lib/modules/2.6.24-rt1-hi3515v100/kernel/net/sunrpc
/sunrpc.ko': No such file or directory
insmod: cannot open module `/lib/modules/2.6.24-rt1-hi3515v100/kernel/fs/nfs_com
mon/nfs_acl.ko': No such file or directory
insmod: cannot open module `/lib/modules/2.6.24-rt1-hi3515v100/kernel/fs/lockd/l
ockd.ko': No such file or directory
insmod: cannot open module `/lib/modules/2.6.24-rt1-hi3515v100/kernel/fs/nfs/nfs
.ko': No such file or directory
modprobe: failed to load module nfs

我这里有内核源码，源码中是包含错误中提到的文件的。请问我如何在SDK中编译内核源码生成hikernel?