iichb0: I2C error

[Jason Bacon]

On 2019-07-14 20:58, Jason Bacon wrote:
> 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
>
Cancel that pattern claim.  I've now seen it occur after a couple of 
warm boots as well.  If I keep rebooting the problem eventually stops.

Always seems to follow I2C error in dmesg, though.

Trying to mount root from ufs:/dev/ada0s3 [rw]...
SMP: 2 CPUs found; 2 CPUs usable; 1 CPUs woken
lo0: link state changed to UP
gem0: link state changed to DOWN
gem0: link state changed to UP
Security policy loaded: MAC/ntpd (mac_ntpd)
iichb0: I2C error
FreeBSD powermacg5.acadix  bacon ~ 835:

Fans go nuts after a few minutes.

Reboot...

Trying to mount root from ufs:/dev/ada0s3 [rw]...
SMP: 2 CPUs found; 2 CPUs usable; 1 CPUs woken
lo0: link state changed to UP
gem0: link state changed to DOWN
gem0: link state changed to UP
Security policy loaded: MAC/ntpd (mac_ntpd)
FreeBSD powermacg5.acadix  bacon ~ 835:

No fan issues.

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