Subject: Re: Strange! Cannot use JFFS2 as root
From: Ian Campbell <icampbell@arcom.com>
To: colin <colin@realtek.com.tw>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <002101c4b6ad$9fe6d880$8b1a13ac@realtek.com.tw>
References: <002101c4b6ad$9fe6d880$8b1a13ac@realtek.com.tw>
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Organization: Arcom Control Systems
Message-Id: <1098282591.29412.1706.camel@icampbell-debian>
Mime-Version: 1.0
Date: Wed, 20 Oct 2004 15:29:51 +0100
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Sender: linux-kernel-owner@vger.kernel.org
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> 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

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