[SOLVED] Unable to mount root fs on unknown-block (0,0)

vbmaster · n00b Joined: 31 May 2006 Posts: 52 Location: Portugal

Hi,

Well, there's always one day when we get up and decide to upgrade our system, the problem is that it usually ends bad. :s
I did a fresh Gentoo 2006.1 install, and it occured with no problem at all, I was already used to the gentoo instalation system.

The problem came after the first reboot, I'm almost absolutely sure that I correctly set up my grub.conf and /etc/fstab as well as I selected all the things in the kernel (as <*> ) that happeared to me that I'll need.

On the load of the system the error is:

artic · Veteran Joined: 22 Nov 2003 Posts: 1208

wynn · Advocate Joined: 01 Apr 2005 Posts: 2421 Location: UK

AFAIK "notail" is only needed for /boot and boot is OK (the kernel is loaded) but if "notail" doesn't solve your problem, would you like to check your kernel settings against [FAQ] KC13: I just installed a new kernel and it won't boot
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Thnikkaman · n00b Joined: 30 Jun 2004 Posts: 63

Is this a second hard drive you are booting off of? If not, then your root perameter should be root = (hd0,2) not (hd1,2) I think.
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vbmaster · n00b Joined: 31 May 2006 Posts: 52 Location: Portugal

Yes, it is a second hard drive.

Well kernel settings... they're so many... and in the previous version (2006.0) I just put the ones refered in the handbook and there was no problems... :\...

wynn · Advocate Joined: 01 Apr 2005 Posts: 2421 Location: UK

Thnikkaman · n00b Joined: 30 Jun 2004 Posts: 63

Go through these steps.

I am currently having this problem as well, but for different reasons. I have a kernel that boots, that I am trying to configure a new kernel from. I may have to do my configuration from scratch, but oh well.
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Emopig · Apprentice Joined: 15 Mar 2006 Posts: 188

This is a hunch, try enabling the following in your kernel config:

CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_SG=y

I recently had this same error trying out a 2.6.19-rc kernel and it was re-enabling one of the top two that fixed it, but I do have a SATA drive :oops:

If I remember correctly the option in the kernel config that provides the "root=" parameter support (I read it somewhere but I can't find the damn thing now) mentions some other bits you need to enable for it to work and I think it may have been in the SCSI layer.
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vbmaster · n00b Joined: 31 May 2006 Posts: 52 Location: Portugal

Thnikkaman · n00b Joined: 30 Jun 2004 Posts: 63

Any luck with this?
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vbmaster · n00b Joined: 31 May 2006 Posts: 52 Location: Portugal

The given gentoo foruns thread solved the problem.

Thanks!

alzz · n00b Joined: 11 Feb 2004 Posts: 5 Location: Korea

I got the same error that you posted and solved it.
[FAQ]KC13 by wynn really worked for me. It showed me that I've missed unchecking an kernel option in ATA/ATAPI/MFM/RLL support.
Thanks you all guys.

vbmaster, you better add [SOLVED] to your post title.
And thank for your posting.

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vbmaster · n00b Joined: 31 May 2006 Posts: 52 Location: Portugal

Ops, I forgot this time.. thanks.

Just to give more info, what was wrong in my kernel was missing built-in modules that were needed.

Thnikkaman · n00b Joined: 30 Jun 2004 Posts: 63

Awesome, glad to see it worked.
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