[coreboot] Coreboot+FILO on qemu

[Ravishankar]

I am forwarding this for the benefit of any newbies out there like me...A
big thanks to Ron Minnich for patiently helping me out.

-Ravi
Forwarded conversation
Subject: Coreboot+FILO on qemu
------------------------

From: *Ravishankar* 
Date: Fri, Apr 10, 2009 at 6:28 PM
To: [e-mail]

Hello,

I was trying to run a linux kernel from FILO but got some errors.The
following explains best what i did.

1.Downloaded FILO and built libpayload and FILO
2. Downloaded and built Coreboot with filo.elf as the image
3.Created a hard disk image in /home/ravi/  and formatted it

*$ qemu-img create -f raw disk.img 200M
    $ mkfs.ext2 -F disk.img*
4.As root, mounted the disk
    * $mkdir /mnt/rootfs
     $mount -o loop disk.img /mnt/rootfs*
5.And copied vmlinuz and initrd from the /boot/ folder(openSuse11.1).
  *$ mkdir /mnt/rootfs/boot
  $ cp /boot/vmlinuz /mnt/rootfs/boot/vmlinuz
  $ cp /boot/initrd /mnt/rootfs/boot/initrd*
6.Unmounted /dev/rootfs
7.Started qemu:*qemu -L ~ -hda disk.img  -nographic*
(i had to copy vgabios-cirrus.bin from /usr/share/qemu to my home directory
beacuse it qemu complained that it was missing)
8.All is well, i get FILO prompt.Now according to
http://www.coreboot.org/QEMU_Build_Tutorial, i try:
*filo>hda:/boot/vmlinuz root=/dev/hda initrd=/boot/initrd console=ttyS0
Error 27: Unrecognized command
filo>*
9.So i try:
*filo>kernel /boot/vmlinuz root=/dev/hda initrd-/boot/initrd console=ttyS0
filo>boot
Booting '/boot/vmlinuz root=/dev/hda initrd-/boot/initrd console=ttyS0'
read_sector: device not open
File not found.
filo>*

What am i doing wrong ?

Thanks,
Ravi

----------
From: *ron minnich* 
Date: Fri, Apr 10, 2009 at 8:27 PM
To: Ravishankar 
Cc: [e-mail]

I don't know why this did not work, I guess the default is the new
command syntax from grub.
OK, do this first:

file> root (hd0)

Then:
It should then work. It works for me.

ron

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From: *Ravishankar* 
Date: Fri, Apr 10, 2009 at 10:08 PM
To: ron minnich

Hello Ron,
I am still getting the file not found message:

*filo> root [hd0]Unknown device type

Error 15: File not found
filo>
*
My doubt is whether i am correct in copying the initrd and vminuz from my
OS's /boot folder into disk.img.May be i should compile the kernel from
scratch and then copy the resulting files to the disk.img? Should i aslo
copy the entire root file system?

The probe command returns that no drive exists.
*filo> probe
Drive 1 does not exist
IDE time out
reset failed, but slave may exist
hdc: ATAPI: QEMU DVD-ROM
Media detection failed
Drive 3 does not exist
IDE channel 2 not found
IDE channel 2 not found
IDE channel 3 not found
IDE channel 3 not found
filo>*

-Ravi