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From: gaxt <>
To: Yifang Dai <>
Subject: Re: 2.6.0-test2 - VFS: Cannot open root device "NULL" or sda1
Date: Mon, 28 Jul 2003 00:23:36 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Yifang Dai wrote:
> On Sun, Jul 27, 2003 at 08:42:13PM +0000, Henrik Storner wrote:
>>So I know 2.6.0-test1 works for me. But 2.6.0-test2 with the same
>>configuration (just a "make oldconfig" in between) stops during boot
>>VFS: Cannot open root device "NULL" or sda1
>>Please append a correct "root=" boot option
>>Kernel panic: Unable to mount root fs on sda1
> I've got the same error, except my root device is /dev/hda3. It also
> worked in 2.6.0-test1 :)

I believe you need to change in your grub.conf file the root=/dev/hda3 
to a root=### ie root=0307

The number is composed of 3 pieces

(a) major device number ie. 3 above (leading zero is ignored)
(b) minor device number ie. 0 above
(c) partition on device ie. 7 above

I use hdb. hda and hdb are both major device number 3

hda is minor device number 0
hdb is minor device number 64
BUT minor device number is in base 16
so in base 16, hda is 0 (0x16=0) and hdb is 4 (4x16=64)


my root=/dev/hdb4 becomes root=344 (ie. maj device 3, minor device 64 
(4x16) and partition #4.


hda1 = 301
hda3 = 303
hdb1 = 341
hdb4 = 344 etc.

Pardon if this is obvious. To determine linux device numbers, google. 
there's a list out there. I found a list below:

  reply	other threads:[~2003-07-28  3:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-27 20:42 2.6.0-test2 - VFS: Cannot open root device "NULL" or sda1 Henrik Storner
2003-07-28  2:28 ` Yifang Dai
2003-07-28  4:23   ` gaxt [this message]
2003-07-28 22:46     ` Henrik Storner
2003-07-28 19:42   ` 2.6.0-test2 - Strange Terminal Problems- Gramofile gaxt
2003-07-28 19:48     ` 2.6.0-test2 - Strange Terminal Problems- Gramofile UPDATE - Scheduler? gaxt

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