[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)

[Jukka A. Ukkonen]

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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