RE: Multiple kernels OOPS at boot on Fujitsu pt510 ( AMD DX100 CPU ) - ksymoops output attached

[Richard B. Johnson]

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On Fri, 1 Mar 2002, Torrey Hoffman wrote:

> Richard B. Johnson [mailto:[e-mail]] wrote:
> 
> [... snipped: using 2.4.1 because... ]
> 
> > Later versions, including the current 2.4.18 fail, to mount an initrd.
> 
> I have successfully used ext2-formatted initrd's with a variety of recent 
> kernels between 2.4.16 and 2.4.18.  The only problem I've ever had is that 
> when _building_ an initrd, kernels between 2.4.10 and 2.4.18-pre-something
> had a bug in the ramdisk driver.  This has been fixed in later kernels, 
> and there is also a workaround for it.
> 
> > Once somebody makes a kernel they has both a working loop device and
> > a working initial RAM Disk, I will use that kernel. In the meantime,
> 
> My workstation is running a 2.4.18-pre? which successfully mounts CDROM
> ISO images on loopback and successfully creates and boots initrd's.
> 
> Are you sure this is not something specific to your setup or config?
> 
> Torrey Hoffman

I have gone this far; I can include SCSI in the initial build so
I can boot and mount a root file-system.

This is on 2.4.17. Once I am up, I can build an ext2 file-system ramdisk-
image. I can mount it though the loop device and I can read/write to
it the ram disk and the loop device together work.

However, I should be able to do:
mke2fs -Fq /dev/ram0 1440
# This works ... 
mount /dev/ram0 /mnt
# This fails to mount the loop-back device. If I do:
mount -o loop -t ext2 /dev/ram0 /mnt. That works.

Given that, when the kernel uncompresses initrd, and attempts to
mount the root file-system, it doesn't mount it through the loop
device. Instead, in tries to mount it directly. This is probably
what fails. Something has been broken for quite some time and
nobody else seems concerned.

If I boot 2.4.1, I can do:
mke2fs -Fq /dev/ram0 1440
mount /dev/ram0 /mnt

This all works fine.

Attached is my 'ram-disk' tester. If it works on your version
of kernel, please let me know what version it is. This makes
a bootable floppy which loads a tiny program that pretends that
it's init. It doesn't touch your hard disks or anything like
that. It is useful to make such a bootable floppy to verify that
some CPU that you might want to purchase, will boot Linux. This
is what the script was originally used for.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).

        111,111,111 * 111,111,111 = 12,345,678,987,654,321

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