Booting yaboot from OpenBIOS boot prompt under Qemu-system-ppc emulator

[Paul Nasrat]

On 10 February 2010 19:49, Benjamin Henrion <bh at udev.org> wrote:
> On Wed, Feb 10, 2010 at 8:26 PM, Paul Nasrat <pnasrat at googlemail.com> wrote:
>> On 10 February 2010 18:04, Benjamin Henrion <bh at udev.org> wrote:
>>> Hi,
>>>
>>> I am trying to boot a systemrescuecd ISO file for PPC:
>>>
>>> http://sourceforge.net/projects/systemrescuecd/files/sysresccd-ppc/0.2.0/sysresccd-ppc-0.2.0.iso/download
>>>
>>> With Qemu:
>>>
>>> /usr/bin/qemu-system-ppc -boot d -m 256 -cdrom
>>> /home/zoobab/soft/systemrescuecd/sysresccd-ppc-0.2.0.iso -net
>>> nic,vlan=0 -net user,vlan=0 -localtime -nographic
>>>
>>> Then I have the OpenBIOS boot prompt.
>>
>> What version of Qemu and what OF emulator/implementation is it using?
>
> Here it is:
>
> root at buzek /home/zoobab/soft [4]# /usr/bin/qemu-system-ppc --version
> QEMU PC emulator version 0.11.0 (qemu-kvm-0.11.0), Copyright (c)
> 2003-2008 Fabrice Bellard
> root at buzek /tmp [44]# /usr/bin/qemu-system-ppc -cdrom
> /home/zoobab/soft/systemrescuecd/sysresccd-ppc-0.2.0.iso -nographic
> -boot d
>>> =============================================================
>>> OpenBIOS 1.0 [Nov 30 2009 23:14]
>>> Configuration device id QEMU version 1 machine id 2
>>> CPUs: 1
>>> Memory: 128M
>>> UUID: 00000000-0000-0000-0000-000000000000
>>> CPU type PowerPC,750
> Welcome to OpenBIOS v1.0 built on Nov 30 2009 23:14
>
>>> File not found
>>> *** Boot failure! No secondary bootloader specified ***
>

OK this looks like it's likely to be an issue with the firmware
support of qemu and how that works with the iso

isodebug sysresccd-ppc-0.2.0.iso
ISO-9660 image created at Tue Jul 20 03:27:17 2004

Cmdline: 'mkisofs 2.01a28 -J -r -netatalk -hfs -probe -map
boot/map.hfs -part -no-desktop -hfs-volid SRC -hfs-bless ./boot -o
../cool.iso .'
[pnasrat at leonidas ~]$

So this is built as a hfs hybrid volume which will work on an
OpenFirmware that boots like a mac.

sudo mount -o loop,ro sysresccd-ppc-0.2.0.iso /mnt/
ls /mnt/boot/
boot.msg  initrd.img.gz  map.hfs  ofboot.b  System.map  vmlinux
yaboot  yaboot.conf  yaboot.conf.orig

That all looks good, ofboot.b is correct for a mac.

However booting into the firmware I can't do

0 > pwd /pci at 80000000/pci-ata at 3/ata-1 at 0,5/cdrom at 1 ok
0 > .properties
name                      "cdrom"
device_type               "block"
#address-cells            1
#size-cells               0
reg                       1
 ok

0 > boot /pci at 80000000/pci-ata at 3/ata-1 at 0,5/cdrom at 1:,\boot\yaboot
>> *** Boot failure! No secondary bootloader specified ***
 ok
0 > see boot
: boot
  linefeed parse cr " platform-boot" $find if
  execute then
  2drop cr " Booting " type type cr "   ... not supported on this
system." type cr
  ;
 ok
0 > see platform-boot
primword platform-boot
 ok

Poking around there are some aliases setup: This seems to give a
different error though:

0 > boot cd:,\boot\ofboot.b

>> Can't read ELF image header
>> File not found
>> *** Boot failure! No secondary bootloader specified ***
 ok

So I think this is what you want:
0 > boot cd:,\boot\yaboot

Hope that helps.

Paul