[Bug 235060] [boot] FreeBSD 12.0 Release DVD and CD will not boot on PowerMac G5 Quad

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235060

--- Comment #30 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Dennis Clarke from comment #29)

Quoting some from what Dennis reported elsewhere
to give some context on ho to reproduce what he
is now reporting:

QUOTE
. . . I [...] fetched the snapshot dvd :

http://ftp.freebsd.org/pub/FreeBSD/snapshots/powerpc/powerpc64/ISO-IMAGES/13.0/FreeBSD-13.0-CURRENT-powerpc-powerpc64-20190718-r350103-disc1.iso

I carefully burned it to a DVD-RW and then used readcd to read back in
the data from the DVD-RW and did a sha512 hash check compare. Perfect.

I can confirm that usefdt=1 is required. Any attempt to boot that dvd
without that wwill provide a black screen and fans roaring. I did also
try kern.smp.disabled=1 by itself. Blank screen. Fans roaring.
END QUOTE

I've no clue at this point if use of materials from:

https://artifact.ci.freebsd.org/snapshot/head/r350103/powerpc/powerpc64/

would also reproduce the problem vs. not.

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