Failed attempt to boot a (non-debug) head -r339076 on an old PowerMac G5 "Quad Core" (built via devel/powerpc64-gcc): Waking up CPU 1

[Michael Tuexen]

> On 8. Oct 2018, at 19:00, Mark Millard <marklmi at yahoo.com> wrote:
> 
> [kern.smp.disabled=1 is confirmed to enable booting
> my head -r339076 build on teh "Quad Core", much like
> the 11.2 reports for "2MHz dual-core".]
Does 11.2 run with smp enabled?

Best regards
Michael
> 
> On 2018-Oct-8, at 3:09 AM, Michael Tuexen <tuexen at fh-muenster.de> wrote:
> 
>>> On 8. Oct 2018, at 09:48, Mark Millard via freebsd-ppc <freebsd-ppc at freebsd.org> wrote:
>>> 
>>> [I finally have access to old PowerMacs again. The below
>>> is based on my environment for experimenting with building
>>> via more modern C/C++ compilers with matching toolchains.
>>> The build here was via a cross build from amd64 via
>>> devel/powerpc64-gcc .]
>>> 
>>> When I attempt to boot the PowerMac G5 "Quad Core"
>>> with my head -r339076 build it gets as far a reporting
>>> (based on boot -v output):
>>> 
>>> . . .
>>> ada0: (I'll not list the 5 ada0: lines)
>>> GEOM: new disk cd0
>>> GEOM: new disk ada0
>>> Adding CPU 0, hwref=ff89d680, awake=1
>>> Waking up CPU 1 (dev=ff89eb70)
>>> 
>>> That is the last of the output. After a while the fans
>>> wind up. (The text is hand translated from a picture
>>> of the screen.)
>>> 
>>> Without the "boot -v" the "ada0:" lines are the last to
>>> show.
>>> 
>>> The build is a non-debug build (with symbols). I've
>>> not tried a debug kernel build yet. It may be a while
>>> before I will get to. Nor have I tried a gcc 4.2.1
>>> based build yet.
>>> 
>>> At this point I do not have a clue what is going on.
>>> This early in the boot I'm not sure how or if I'll
>>> get a clue. (I've never had serial console access
>>> on the old PowerMac's, which contributes to the messy
>>> context.)
>>> 
>>> I do have in place in the variation used of src.conf:
>>> LOADER_DEFAULT_INTERP=4th
>>> 
>>> The PowerMac G5 used does boot fine with the boot disk
>>> I had experimented with back in May (or before).
>> Does it boot when you disable SMP by adding
>> kern.smp.disabled=1
>> to /boot/loader.conf
>> 
>> This turned a non-booting/hanging up dual CPU G5 into a
>> very stable (single core) machine...
> 
> Sure enough, kern.smp.disabled=1 lets my -r339076
> devel/powerpc64-gcc based build boot on the G5
> "Quad Core".
> 
> Unfortunately I jumped from -r333594 (May-13) to
> -r339076 so I can not well narrow the range for
> when things changed beyond that.
> 
> I see that the original report was for 11.2,
> while I'm using head. Also that Justin reported
> seeing the problem on a 2GHz dual-core too (on
> 11.x I assume).
> 
> So we have . . .
> 
> 2GHz dual-core (11.2)
> 2.5 GHz "Quad Core" (2 dual-core processors) (head)
> 
> as contexts so far, not that the internal issue
> needs to be the same for the two, but it might be.
> 
> I wonder if 11 at, say, -r333583 (May-13) might
> be before its problem. If so, it might be easier
> for someone using 11.x variants to find when
> it broke in 11 than to do so for head, presuming
> the problem is common.
> 
> Is there a bugzilla for this?
> 
> ===
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
> 

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