iichb0: I2C error

[Jason Bacon]

On 2019-07-14 19:46, Justin Hibbits wrote:
> On Sat, Jul 13, 2019 at 9:32 AM Jason Bacon <bacon4000 at gmail.com> wrote:
>>
>> On my PowerMac G5, I consistently get this error after a cold boot:
>>
>> iichb0: I2C error
>>
>> After a minute or so, the fans ramp up to maximum.
>>
>> The error also consistently goes away after a warm reboot.  Nothing more
>> in dmesg:
>>
>> FreeBSD powermacg5.acadix  bacon ~ 211: dmesg|grep iichb0
>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on unin0
>> iicbus0: <OFW I2C bus> on iichb0
>> iichb0: I2C error
>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on unin0
>> iicbus0: <OFW I2C bus> on iichb0
>>
>> No more runaway fans.
>>
>> Does this provide any clues about the cause?
> Hi Jason,
>
> How recently did this start occurring?  Would you be able to bisect
> the builds from a known-good starting point?
>
> Thanks.
>
> - Justin
I've never run a powerpc system until a few months ago, and this has 
always been an issue on the PowerMac.  I just recently established the 
pattern that it only happens after a cold boot, though.  I also have an 
iMac G5 that does not exhibit this issue.  Both are running 
12.0-RELEASE.  If you think it might help, I can try a 13 snapshot at 
some point.

Cheers,

     JB

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