Re: [Qemu-ppc] [PATCH 00/13] cuda: misc fixes and cleanups

[Programmingkid]

> On Wed, 27 Jan 2016, Herv? Poussineau wrote:
>> Unfortunately, Finnix doesn't try to access I2C bus, not even to initialize 
>> it. I suppose it is because OpenBIOS doesn't describe the I2C bus in the 
>> device tree...
> 
> The kernel in Finnix seems to have a driver but unfortunately I2C 
> debugging is not enabled so you probably won't get much useful info. The 
> best idea in this case is probably to compile a kernel with debugging 
> messages for I2C so you get some info on where it fails if it tries to 
> find the bus at all.
> 
> It could be that the problem is that the device tree does not correctly 
> describe something. Real hardware seems to have two i2c aliases related to 
> some serial ports that is believed to maybe causing problems with MacOS 9
> (see: 
> http://web.archive.org/web/20090107145016/http://penguinppc.org/historical/dev-trees-html/g4_agp_400_1.html#.)

I don't think Linux does anything with OpenBIOS or the device tree. I think
Linux just probes for devices instead.