移植根文件系统

ALSA device list:
  No soundcards found.
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "mtdblock2" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00          262144 mtdblock0 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[<c002e71c>] (unwind_backtrace+0x0/0xdc) from [<c02aa828>] (panic+0x40/0x110)
[<c02aa828>] (panic+0x40/0x110) from [<c0008fcc>] (mount_block_root+0x1d0/0x210)
[<c0008fcc>] (mount_block_root+0x1d0/0x210) from [<c0009264>] (prepare_namespace+0x164/0x1bc)
[<c0009264>] (prepare_namespace+0x164/0x1bc) from [<c0008598>] (kernel_init+0xb4/0xe0)
[<c0008598>] (kernel_init+0xb4/0xe0) from [<c004b8bc>] (do_exit+0x0/0x578)
[<c004b8bc>] (do_exit+0x0/0x578) from [<00000001>] (0x1)

上面的代码是按照天嵌科技出品—Linux移植之Step By Step_V4.2移植的，到了Step 11步，出现了这个问题，还请各位高手指教！

你这个是从NFS启动，需要连接网线，启动PC的Linux的NFS服务器，然后才能从NFS启动。

2# 亚瑟王


怎么会这样？ 我都是按照移植手册上面的步骤来的啊？ 怎么会启动NFS?

求答案？ 进入NFS 是内核配置问题，还是根文件配置问题？
多次检查，始终没有找到原因。。。

4# eduardo_c


你没先把你的yaffs文件系统挂载到内核中，或者是你的内核没有对yaffs文件系统的支持。他才会直接提示NFS系统。先检查内核是否对yaffs的支持吧。