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2004 May 28 17:11

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Re: [vox-tech] Can't mount root while booting 2.6.5 kernel
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Re: [vox-tech] Can't mount root while booting 2.6.5 kernel



On Fri, May 28, 2004 at 03:45:01PM -0700, Chris Jenks wrote:
> 
>   I wrote recently about a problem I was having getting PCMCIA working
> under a custom 2.6.5 kernel. Actually, I meant the 2.6.3 kernel, because
> when I tried upgrading to the 2.6.5 kernel source that recently appeared
> in the Sarge source tree, the boot fails after about one page of messages.
> The following lines appear under the working 2.6.3 kernel but not the
> 2.6.5 kernel:
> 
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
> hda: IBM-DTCA-23240, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: max request size: 128 KiB
> hda: 6354432 sectors (3253MB) w/486KiB cache,CHS=6304/16/63
>   hda: hda1 hda2 hda3
> 
> and a few lines later, 2.6.3 gives:
> 
> VFS: Mounted root (ext2 filesystem) readonly.
> 
> but 2.6.5 gives:
> 
> VFS: Cannot open root device "303" or unknown-block(3,3)
> Please append a correct "root=" boot option
> Kernel panic: VFS: Unable to mount root fs on unknown-blobk(3,3)
> 
>   From googling I've found that this is a common problem under 2.6 kernels
> but there seems to be a variety of causes. I've tried setting the kernel
> command line to root=/dev/hda3, root=303 or devfs=monount. I've removed
> LBA32 from lilo.conf, installed module-init-tools and udev, and I've
> confirmed that ide.o is being compiled into the kernel. The reason I
> installed udev was that the kernel config help for "/dev file system
> support" says that devfs has been replaced by udev, but the 2.2.20 kernel
> (my working fallback) doesn't (try to) start udev until after VFS. My
> starting configuration for 2.6.5 was the one that produced a booting
> kernel for 2.6.3.
> 
>   The hardware is an IBM Thinkpad 701C 486 with an ISA bus (no PCI) and an
> ATA-3 hard drive (according to hdparm). CONFIG_ISA=Y in the kernel config.
> If anyone has any suggestions, I would really appreciate them.

The most common cause of this problem is when your root filesystem
isn't compiled into the kernel and you aren't using an initrd.

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