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Re: [Qemu-devel] SPARC64: unable to boot OpenBIOS from git master
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] SPARC64: unable to boot OpenBIOS from git master |
Date: |
Sat, 3 Mar 2012 15:09:16 +0000 |
On Mon, Feb 27, 2012 at 06:36, Mark Cave-Ayland
<address@hidden> wrote:
> Hi all,
>
> I've been experimenting with SPARC64 under QEMU, and with current git master
> I am unable to boot OpenBIOS at all with the following error:
>
> OpenBIOS for Sparc64
> Unhandled Exception 0x0000000000000032
> PC = 0x00000000ffd19d84 NPC = 0x00000000ffd19d88
> Stopping execution
>
> Using git bisect indicates that the problem lies with the following commit:
>
>
> commit d5f27e88699f14c802d66c01de70e5ea37b7153a
> Author: Michael S. Tsirkin <address@hidden>
> Date: Tue Feb 21 15:57:58 2012 +0200
>
> pci: set memory type for memory behind the bridge
>
> As we make upper bits in IO and prefetcheable memory
> registers writeable, we should declare support
> for 64 bit prefetcheable memory and 32 bit io
> in the bridge.
>
> This changes the default for apb, dec, but I'm guessing
> they got the defaults wrong by accident.
> Alternatively, we could let bridges declare lack of
> 64 bit support and make the upper bits read-only zero.
>
> With this applied, we can drop these bits
> from express code.
>
> Reported-by: Gerd Hoffmann <address@hidden>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> Could someone familiar with apb,dec ack this please?
> Signed-off-by: Anthony Liguori <address@hidden>
>
>
> Does anyone have an idea as to whether this is something that needs to be
> fixed in QEMU or OpenBIOS?
No idea. Michael, should the commit be reverted?
It's easy to confirm the bug, just run qemu-system-sparc64 without any
arguments. Bug: black screen, no bug: yellow screen with OpenBIOS boot
text.
In fact, it's pretty annoying to see that even this very minimal
amount of testing effort has not been spent by a critical subsystem
maintainer.
>
> Many thanks,
>
> Mark.
>
- Re: [Qemu-devel] SPARC64: unable to boot OpenBIOS from git master,
Blue Swirl <=