Re: [Qemu-devel] Openbios upgrade broke sparc32 linux.

[Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>]

On 28/06/13 03:08, Rob Landley wrote:

> Commit 467b34689d27 upgraded the openbios image, and ever since my linux
> system images hang about the time they try to initialize interrupts.
>
> http://landley.net/aboriginal/bin/system-image-sparc.tar.bz2
>
> Extract that and "./run-emulator.sh" in the tarball. Using qemu 1.2.0
> for example works fine, you get a shell prompt. Using 1.5.0 hangs.
>
> Rob

Hi Rob,

Thanks for the bug report. I did a quick bisect on OpenBIOS and it 
points to the following commit:

commit 167aafd70f64e74a77787ca5bf9f4dc750b27fc3
Author: blueswirl <blueswirl@f158a5a8-5612-0410-a976-696ce0be7e32>
Date:   Sun Feb 3 16:50:11 2013 +0000

     SPARC32: microSPARC-II identification

     For the microSPARC-II = Fujitsu MB86904 = Sun STP1012PGA,
     PSR.IMPL=0 and PSR.VERS=4.

     This CPU model is used as default by QEMU when emulating
     a SparcStation-4 or SparcStation-5.

     Signed-off-by: Olivier DANET <odanet@caramail.com>
     Signed-off-by: Blue Swirl <blauwirbel@gmail.com>


The commit itself is very simple and looks like this: 
http://git.qemu.org/?p=openbios.git;a=commitdiff;h=0fe772df8717ef75d91eae8ef221e9966ce2fd7f.

My guess would be that Linux is trying to do some slightly different 
initialisation based upon identifying the CPU, but I'm not too familiar 
with the kernel code myself. Blue/Olivier - can either of you comment on 
this?


ATB,

Mark.