[OpenBIOS] SPARC32 SBus probing with OBP

[Artyom Tarasenko]

On Sat, May 12, 2012 at 5:46 PM, Mark Cave-Ayland
<mark.cave-ayland at ilande.co.uk> wrote:
> Hi all,
>
> Does anyone know how OBP probes for in-built SBus devices on SPARC32? The
> reason I'm asking is that I'm looking at trying to detect in-built devices
> in OpenBIOS, and the SBus documentation suggests that each slot contains
> Fcode mapped at offset 0 which is executed to build the device tree.
>
> Now QEMU currently doesn't do any Fcode mapping within SBus slots, but
> according to its boot output OBP still manages to detect hardware such as
> graphics cards etc. within certain slots during boot. Is there a different
> mechanism used for detecting in-built devices, or is it just something as
> simple as a hardcoded list based upon the current machine type?

I think it's the later. I had to implement a FCode stub for a dbri
device, as I played with the SS-20 OBP, because it just blindly tried
to execute the code there.

Artyom

-- 
Regards,
Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/search/label/qemu