[Bug 239245] r350074 will panic on ppc64 PowerMac G5 in vm_phys_enqueue_contig

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239245

--- Comment #36 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Francis Little from comment #35)

For my context:

Apple PowerMac11,2 5.2.7f1 BootROM built on 09/30/05 at 15:31:03

What is added to the quads could matter. I've got:

16 GiBYte of ECC RAM

vgapci0 at pci0:10:0:0:    class=0x030000 card=0x005210de chip=0x009210de rev=0xa1
hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'G70 [GeForce 7800 GT]'
    class      = display
    subclass   = VGA

1 or two SSD's on the SATA connections.

Nothing else added inside. Outside:

One Ethernet cable connected
one USB keyboard connected
one display connected to the GeForce 7800 GT

Nothing else connected outside.


My reported boots of r350055 and r350074 from artifact.ci
were without usefdt mode being enabled (or anything else
bieng set specially).



I'll note that I patched usefdt code in my personal builds
because at the time I had access to:

2 distinct types of 64-bit PowerMacs
3 or so types of 32-bit PowerMacs, including one iMac G3.

but usefdt mode could not boot most of them, but could for
the two examples of G5 quads. Getting them to all boot lead
to what I've reported about usefdt mode. It also showed that
the quads booting was lucky based on on the typs of problems
usefdt has for PowerMacs. This was before the fix that has
(generally?) avoided needing usefdt mode.

(I ignore here one type of G4 that I had access to that I've
never gotten FreeBSD to boot. I've only sometimes had access
to one specific machine of that type.)

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