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Re: Strange! Cannot use JFFS2 as root

To: colin <>
Subject: Re: Strange! Cannot use JFFS2 as root
From: Charles Eidsness <>
Date: Wed, 20 Oct 2004 10:19:53 -0400
In-reply-to: <001301c4b6ad$70ce4420$>
Original-recipient: rfc822;
References: <001301c4b6ad$70ce4420$>
User-agent: Mozilla Thunderbird 0.8 (Windows/20040913)
Hi Colin,

I had a similar problem. You're passing root=/dev/mtdblock1 which has a
major value of 31 and a minor value of 1 but the by the looks of the
error message the kernel thinks you want to boot from a device with a
major number of 2 and a minor number of zero. You could try passing an
explicitly defined root=1F01 instead (major 31, minor 1). This works for
me. I have no idea why the kernel doesn't recognize the text based
declaration and haven't had time to investigate. Maybe someone else has
a better idea than I do.

Hope that helps,

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=
> ip=
> 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?
> Thanks and regards,
> Colin

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