[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 #49 from Dennis Clarke <dclarke at blastwave.org> ---
(In reply to Francis Little from comment #32)

Following in the foot steps of Francis Little I also 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.

So now that I have this dvd booted I may as well install and then have
consistent output from uname -apKU and then we plow forwards chasing
this dragon. 

Dennis

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