[OpenBIOS] [RFC PATCH 1/2] add power-mgt node under /pci/mac-io/via-cuda

[Mark Cave-Ayland]

On 24/02/13 00:24, Amadeusz Sławiński wrote:

> xnu needs power-mgt node otherwise it panics
> http://www.opensource.apple.com/source/AppleCore99PE/AppleCore99PE-121.0.2/Core99.cpp
>
> I see two possible locations
> either /pci/mac-io/power-mgt
> http://web.archive.org/web/20090107152212/http://penguinppc.org/historical/dev-trees-html/g3bw_350.html
> or /pci/mac-io/via-cuda/power-mgt
> http://web.archive.org/web/20090107144433/http://penguinppc.org/historical/dev-trees-html/g3_beige_300.html
>
> also seen it under /pci/pci-bridge/mac-io/via-pmu/power-mgt
> http://web.archive.org/web/20090107151044/http://penguinppc.org/historical/dev-trees-html/g4_agp_500_2.html
>
> Seems like it is basically used to fake powermanagement

Agreed - it doesn't seem to matter particularly where the node lies, but 
I suppose it's a hint for the parent device. I'd compare the OpenBIOS 
device tree with the historical dev trees ("cd /" followed by 
"show-devs"), work out which Mac99 model is closest (hence being the 
model emulated by QEMU) and use that as a baseline.


HTH,

Mark.