Re: [Qemu-devel] OpenHackWare hacking

[Ed Swierk]

A bit more progress--I can boot the Fedora 6 PPC boot.iso and start Anaconda.

- Both VGA and serial console work with the g3bw machine type; mac99 still 
crashes early on.

- IDE interrupts are still messed up; my Qemu patch is obviously not quite 
right.

- OHW's CHRP boot script parsing isn't sophisticated enough to pass arguments 
to yaboot, as the Fedora 6 boot script does, but you can the arguments 
manually with the -append option.

- The Linux serial console is very slow.

Here's how I'm starting Qemu:

qemu-system-ppc -cdrom boot.iso -s -append 'conf=cd:,
\ppc\ppc32\yaboot.conf' -nographic

Please see the attached patches to OHW and Qemu; I've also included a compiled 
OHW image.

--Ed

On Friday 20 April 2007 16:08:56 Ed Swierk wrote:
> The attached patch addresses a few problems in OpenHackWare:
>
> - The return value from the OpenFirmware read function should not exceed
> the actual file size by more than one block; otherwise the Linux kernel's
> initramfs routines get confused by the extra junk and reject the initramfs.
>
> - The OpenFirmware nextprop function should return 1 when a property is
> found, not the length of the property's name. Otherwise Linux fails to find
> any properties when unflattening the device tree.
>
> - If the boot file's checksum is unknown, OpenHackWare should assume it's a
> Linux or OpenBSD boot script rather than barfing.
>
> - The linker script requires Daniel Jacobowitz's fix to build on Fedora 6.
>
> These changes get me a few steps closer to booting an unmodified Fedora 6
> PowerPC boot.iso. Outstanding issues include:
>
> - The Fedora 6 version of yaboot looks for a "conf=" parameter in the
> bootargs to tell it where to find yaboot.conf; OHW needs to read this
> parameter from the boot script and pass it along.
>
> - After the kernel finally boots, it complains about unhandled interrupts
> for the CD device. I assume this is a Qemu issue.
>
> Comments welcome.

ohw2.patch
Description: Text Data

qemu-ppc-interrupts.patch
Description: Text Data

ppc_rom.bin.bz2
Description: BZip2 compressed data