* Strange! Cannot use JFFS2 as root
@ 2004-10-20 14:03 colin
2004-10-20 14:29 ` Ian Campbell
0 siblings, 1 reply; 3+ messages in thread
From: colin @ 2004-10-20 14:03 UTC (permalink / raw)
To: linux-kernel
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?
Thanks and regards,
Colin
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Strange! Cannot use JFFS2 as root
2004-10-20 14:03 Strange! Cannot use JFFS2 as root colin
@ 2004-10-20 14:29 ` Ian Campbell
2004-10-21 1:49 ` [*VIP*] " colin
0 siblings, 1 reply; 3+ messages in thread
From: Ian Campbell @ 2004-10-20 14:29 UTC (permalink / raw)
To: colin; +Cc: linux-kernel
> 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?
If I remember correctly you need to pass the root in as the major and
minor numbers for jffs2 on 2.6. For example my 2.6 command line is
root=31:03 rootfstype=jffs2 ro console=ttyS0,115200
rather that root=/dev/mtdblock3.
I can't remember why this is the case though.
Ian.
--
Ian Campbell, Senior Design Engineer
Web: http://www.arcom.com
Arcom, Clifton Road, Direct: +44 (0)1223 403 465
Cambridge CB1 7EA, United Kingdom Phone: +44 (0)1223 411 200
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [*VIP*] Re: Strange! Cannot use JFFS2 as root
2004-10-20 14:29 ` Ian Campbell
@ 2004-10-21 1:49 ` colin
0 siblings, 0 replies; 3+ messages in thread
From: colin @ 2004-10-21 1:49 UTC (permalink / raw)
To: Ian Campbell; +Cc: linux-kernel
Hi Ian,
Thank you. It works by your way.
I had already tried "root=1f:01" and it didn't work, and then I spent whole
day to test it... :-(
It seems that "root=1f01" and "root=31:01" are both acceptable.
Thanks and regards,
Colin
----- Original Message -----
From: "Ian Campbell" <icampbell@arcom.com>
To: "colin" <colin@realtek.com.tw>
Cc: <linux-kernel@vger.kernel.org>
Sent: Wednesday, October 20, 2004 10:29 PM
Subject: [*VIP*] Re: Strange! Cannot use JFFS2 as root
> > 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?
>
> If I remember correctly you need to pass the root in as the major and
> minor numbers for jffs2 on 2.6. For example my 2.6 command line is
> root=31:03 rootfstype=jffs2 ro console=ttyS0,115200
> rather that root=/dev/mtdblock3.
>
> I can't remember why this is the case though.
>
> Ian.
> --
> Ian Campbell, Senior Design Engineer
> Web: http://www.arcom.com
> Arcom, Clifton Road, Direct: +44 (0)1223 403 465
> Cambridge CB1 7EA, United Kingdom Phone: +44 (0)1223 411 200
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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