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From: =?UTF-8?Q?Herv=c3=a9_Poussineau?= <hpoussin@reactos.org>
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Date: Thu, 28 Jan 2016 14:43:21 +0100
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Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 00/13] cuda: misc fixes and
	cleanups
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To: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Alyssa Milburn <fuzzie@fuzzie.org>, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, David Gibson <david@gibson.dropbear.id.au>

Le 28/01/2016 02:45, BALATON Zoltan a =E9crit :
> On Wed, 27 Jan 2016, Herv=E9 Poussineau wrote:
>> Unfortunately, Finnix doesn't try to access I2C bus, not even to initi=
alize it. I suppose it is because OpenBIOS doesn't describe the I2C bus i=
n the device tree...
>
> The kernel in Finnix seems to have a driver but unfortunately I2C debug=
ging 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.
>

I just checked Linux source. arch/powerpc/platforms/powermac/low_i2c.c is=
 searching for 3 types of I2C buses
- if some device in DT is compatible with "keywest-i2c"
- if CONFIG_ADB_PMU is set, if some device in DT is named "pmu-i2c" or "v=
ia-pmu"
- if CONFIG_PMAC_SMU is set, if some device in DT is named "smu-i2c-contr=
ol" or "smu"
So, OpenBIOS needs to be changed to declare an I2C bus.

Then, maybe, I'll get some bus probing.

Regards,

Herv=E9