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Date:      Sun, 14 Jul 2019 20:58:52 -0500
From:      Jason Bacon <bacon4000@gmail.com>
To:        Justin Hibbits <jrh29@alumni.cwru.edu>
Cc:        "freebsd-ppc@freebsd.org" <freebsd-ppc@freebsd.org>
Subject:   Re: iichb0: I2C error
Message-ID:  <7cd57279-ee80-ef46-13e5-aa7f02f14bfa@gmail.com>
In-Reply-To: <CAHSQbTDDaJ0c%2B_E4T0YGbAdVka3bnFP9Rec71j2c2qToYFqLuQ@mail.gmail.com>
References:  <bde639cb-bfab-3da3-f896-538c540b25b7@gmail.com> <CAHSQbTDDaJ0c%2B_E4T0YGbAdVka3bnFP9Rec71j2c2qToYFqLuQ@mail.gmail.com>

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On 2019-07-14 19:46, Justin Hibbits wrote:
> On Sat, Jul 13, 2019 at 9:32 AM Jason Bacon <bacon4000@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 mo=
re
>> in dmesg:
>>
>> FreeBSD powermacg5.acadix  bacon ~ 211: dmesg|grep iichb0
>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on u=
nin0
>> iicbus0: <OFW I2C bus> on iichb0
>> iichb0: I2C error
>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on u=
nin0
>> 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=20
always been an issue on the PowerMac.=C2=A0 I just recently established t=
he=20
pattern that it only happens after a cold boot, though.=C2=A0 I also have=
 an=20
iMac G5 that does not exhibit this issue.=C2=A0 Both are running=20
12.0-RELEASE.=C2=A0 If you think it might help, I can try a 13 snapshot a=
t=20
some point.

Cheers,

 =C2=A0=C2=A0=C2=A0 JB

--=20
Earth is a beta site.





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