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

[Mark Millard]

[Reverting head -r334498 in my head -r339076 context was enough to get
the G5 so-called "Quad Core" to boot just fine as a variant of
-r339076 .]

On 2018-Oct-9, at 12:54 PM, Mark Millard <marklmi at yahoo.com> wrote:

> On 2018-Oct-9, at 8:20 AM, Mark Millard <marklmi at yahoo.com> wrote:
> 
>> [The stable/head mix seems to be a wrong idea: 11.2 gets past
>> the SMP: messages just fine on the so-called G5 "Quad Core".]
>> 
>> On 2018-Oct-8, at 5:14 PM, Mark Millard <marklmi at yahoo.com> wrote:
>> 
>>> On 2018-Oct-8, at 1:27 PM, Justin Hibbits <chmeeedalf at gmail.com> wrote:
>>> 
>>>>> . . .
>>>> 
>>>> It would be helpful to know the last known-good SVN revision, both for
>>>> Head and 11.x, as well as the oldest failing one.  Since my G5 bit the
>>>> dust, I can't check locally.
>>> 
>> . . .
> 
> There are examples of head's kernels that sometimes
> fail to get to the "SMP:" messages and sometimes work
> for getting there (and beyond). So:
> 
> My reporting any example failure is a solid indicator
> of the "does not reach "SMP:" problem in that build.
> (All tries reached the waking message on at least cpu
> 1.)
> 
> My reporting "worked" for a revision might be a
> misclassification. (This makes for a messier
> "binary-like search".)
> 
> That said, the summary of the later detail is:
> 
> head -r334494 kernel worked
> head -r334528 kernel failed
> 
> (There is nothing between those for:
> 
> https://artifact.ci.freebsd.org/snapshot/head/r*/powerpc/powerpc64/kernel.txz
> 
> so getting a smaller range requires builds.
> I've not attempted that.)
> 
> The only machine-dependent powerpc64 change between
> those 2 that I see is:
> 
> Author: jhibbits
> Date: Fri Jun  1 21:37:20 2018
> New Revision: 334498
> URL: 
> https://svnweb.freebsd.org/changeset/base/334498
> 
> 
> Log:
>  Increase powerpc64 KVA from ~7.25GB to 32GB
> . . .
> 
> . . .

In my -r339076 build context I reverted -r334498, did a
buildkernel, installed it, and rebooted into -r339076.

The result booted just fine.

It does appear that, for head, -r334498 makes the difference
for some reason.


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)