On Wed, Oct 20, 2004 at 10:02:26PM +0800, colin wrote:
>
> Hi all,
> I had booted up Linux with nfs root, and write a JFFS2 image to /dev/mtd1.
> Here is my cmdline for Kernel:
> go 0x80305018 root=/dev/nfs rw nfsroot=172.19.26.145:/nfs/rootfs
> ip=172.19.27.193::172.19.27.254:255.255.254.0:::
> mtdparts=maltaflash:1536k(ldr),2048k(root)
>
> After writing the JFFS2 image to /dev/mtd1, I can mount /dev/mtdblcok1 to
> some directory.
> mount -t jffs2 /dev/mtdblock1 /mnt
>
> Next, I hope to boot up Linux with JFFS2 root, and try to give this cmdline
> to Kernel:
> go 0x80305018 rootfstype=jffs2
> mtdparts=maltaflash:1536k(ldr),2048k(root) root=/dev/mtdblock1
>
> and the Kernel would complain me about no root:
> VFS: Unable to mount root fs via NFS, trying floppy.
> Kernel panic: VFS: Unable to mount root fs on unknown-block(2,0)
>
> I traced the code and found that when passing "/dev/mtdblock1" to
> name_to_dev_t() in do_mounts.c, it would return 0 at every try_name(),
> which will fail at open() with the path "/sys/block/%s/dev".
>
> What's the problem? Could anyone tell me?
What is the kernel version you are using?
Check that root_dev_names array in init/do_mounts.c has an entry,
which looks like
{ "mtdblock", 0x1f00 }
--
Eugene
