[Bug 205458] 11.0-CURRENT/10-STABLE powerpc64: a PowerMac G5 specific sys/powerpc/ofw/ofw_machdep.c change for reliable PowerMac G5 booting (with lots of RAM)

[Nathan Whitehorn]

Maybe firmware needs SPRG1-3 restored? Any chance you could try deleting 
the mtsprg1-3 one-by-one?
-Nathan

On 09/13/16 10:11, Jukka A. Ukkonen wrote:
> On 09/13/16 09:31, bugzilla-noreply at freebsd.org wrote:
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205458
>>
>> --- Comment #5 from Mark Millard <markmi at dsl-only.net> ---
>> Nathan Whitehorn has put out a kernel patch that he is asking for help with
>> testing on PowerMac/iMac G5 variations. See:
>>
>> https://lists.freebsd.org/pipermail/freebsd-ppc/2016-September/008413.html
>>
>> The patch is not just using __powerpc64__ instead of POWERMAC_G5_SPECIFIC_BUILD
>> in my presentation of my hack.
>>
>> Nathan has already tested a PowerMac11,2.
>>
>> If anyone reading this has any other type(s) of Apple G5's and is willing/able
>> it would be good to get in some testing before the change is made to the
>> kernel.
>>
>> I expect that it does not mater much which version/variation of 10.x, 11.0, or
>> 12 is used if the original boot problems can sometimes be observed before the
>> change. Although I'm not sure of the patch automatically applies nicely to all
>> possible vintages of those.
>>
>>
>> As for me. . .
>>
>> It will be a few weeks before I'll again have access in order to test a
>> PowerMac7,2 (or to independently repeat PowerMac11,2 testing). I'll not have
>> access to other Apple G5's. So my range of testing will be rather limited and
>> will not be soon.
>>
> Following Mark's advice I tried an alternate change and
> now at least my PowerMac7,3 boots just fine through the
> autoconfigure phase. The first hiccup I see is with tmpfs
> mount to /tmp, but that, I hope, it is a completely
> unrelated issue.
>
> The patch I am now using on my PowerMac G5 is attached.
> The modification is Mark's, I just tested it. I don't have
> the foggiest idea where and how he figured out this change,
> but at least in my test on one system only it seems to
> work wonders.
>
> --jau
>
>
> PS.
> If someone knows why the tmpfs has started complaining
>
> mount: tmpfs: Operation not supported by device
>
> where it previously (last 11.0-BETA2) worked just fine,
> let me know.
>
>
>
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