[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 #54 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Dennis Clarke from comment #53)

I've now used the DVD that had burned and reported
on previously for booting all of the following ECC
RAM configurations:

16 GiBytes RAM
12 GiBytes RAM
 8 GiBytes RAM
 4 GiBytes RAM

They all booted just fine with no manual settings
made. (I removed memory in pairs from the outside
in.)

Again I had no other drives attached.

One good thing about this test is that avoid
any issues of the vintage/variations of materials
in the apple boot partition on SATA or USB media.

You and I reported the same type of DVD drive:

cd0: <HL-DT-ST DVD-RW GWA-4165B C006> Removable CD-ROM SCSI device
cd0: <HL-DT-ST DVD-RW GWA-4165B C006> Removable CD-ROM SCSI device

This leaves the differences:

    device     = 'G70 [GeForce 7800 GT]'
vs.

    device     = 'NV43 [GeForce 6600]'

and differences in drives attached. Can you try booting
with only the DVD drive present? This could eliminate
anything tied to SATA drives or protocol vintage, leaving
only the video card variations.

(I do not currently have access to a GeForce 6600 or any
alternative video hardware and so can not eliminate this
difference.)

My guess would be that the GeForce 6600 is what is common
that matters for the two of you vs. my not having such.

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