linux-kernel - Re: no DRQ after issuing MULTWRITE_EXT AND PCI: Bus #0b (-#0e) is hidden behind transparent bridge #0a (-#0a) (try 'pci=assign-busses')

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Date:	Sun, 20 May 2007 19:27:37 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Tjenarvi Tjenarvi <tjenarvi@...oo.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: no DRQ after issuing MULTWRITE_EXT AND PCI: Bus #0b (-#0e) is
 hidden behind transparent bridge #0a (-#0a) (try 'pci=assign-busses')

Tjenarvi Tjenarvi wrote:
> When WITHOUT ATA/ATAPi/MFM/RLL support, but I couldn't boot it, I got
> kernel panic.  Here is the last 10 lines messages:
> 
> VFS : Mounted root (ext2 filesystem)
> No kernel modules found for Linux.2.6.22-rc1
> VFS: Cannot open root device "301" or unknown-block (3,1)
> Please append a correct "root=" boot option; here are the available
> partitions:
> 0800   117220824   sda1
>   0801     34178256   sda2
>   0802                   1   sda3
>   0803      43720897  sda5
>   0806      39062016  sda6
> 0b00       1048575   sr0   driver : sr
> kernel panic - not syncing : VFS : Unable to mount root fs on
> unknown-block(3,1)
> 
> 1. My .config with ATA/ATAPi/MFM/RLL support in
> http://www.mydatabus.com/public/Tje/config
> 2. My .config WITHOUT ATA/ATAPi/MFM/RLL support in
> http://www.mydatabus.com/public/Tje/config2
> 
> Why I got kernel panic, it is should work only libata drivers. Thx. 

Because your harddrive changed from /dev/hda to /dev/sda.  You need to
update the root= kernel parameter.

-- 
tejun
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