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

From: BALATON Zoltan
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 00/13] cuda: misc fixes and cleanups
Date: Thu, 28 Jan 2016 02:45:00 +0100 (CET)
User-agent: Alpine 2.20 (BSF 67 2015-01-07)

On Wed, 27 Jan 2016, Hervé 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#.)

ki2c-serial: /address@hidden/@d/address@hidden/i2c/cereal
ui2c-serial: /uni-n/i2c/cereal

but I don't know if any of this is relevant, just mentioning it in the hope that some of this might help. (I've also noticed that real PowerMac3,1 seems to have a modem connected to one of its serial ports so that could also be something MacOS 9 is looking for or tries to use.)


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