NFS开发机 突然启动不鸟了， 各位大侠帮忙指点下

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最近在NFS机器上开发，不知道怎么操作后系统就起不来了，启动报有如下错误信息:

VFS： Unable to mount root fs via NFS, trying floppy.
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Pid: 1, comm: swapper/0 Not tainted 3.2.28 #2
Call Trace:
[<c1661337>] ? printk+0x18/0x1a
[<c1661229>] panic+0x57/0x14d
[<c18e8ac7>] mount_block_root+0x141/0x1c9
[<c10fb517>] ? sys_mknod+0x27/0x30
[<c18e8d42>] mount_root+0xf3/0xfb
[<c18e8e98> prepare_namespace+0x14e/0x188
[<c10ecc80>] ? sys_access+0x20/0x30
[<c18e884a>] kernel_init+0x147/0x14c
[<c18e8703>] ? start_kernel+0x2d7/0x2d7
[<c1670e36>] kernel_thread_helper+0x6/0xd


宿主平台nfs配置：
# /etc/exports: the access control list for filesystems which may be exported
#                to NFS clients.  See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes       hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)
#
/home/ipwall/rootfs 192.168.10.0/24(rw,sync,no_root_squash,no_subtree_check)