[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 #39 from Dennis Clarke <dclarke at blastwave.org> ---
(In reply to Francis Little from comment #31)


Regarding the "usefdt=1" there isa blunt comment from Justin Hibbits on
this at the bottom of :

    Bug 233863 - Various PowerMac G5 models may require 
                 kern.smp.disabled=1 and must set usefdt=1 which
                 causes net interface reorder 
    https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233863

Essentially don't do that. 

So based on the word done there I don't any longer and the machine works
as expected and the network interfaces don't mystically re-order. 

Let's keep plowing forwards here as this feels like something is wrong
with the native kernel build process but then again it is hard to say
when I have a mixed up kernel and "world" revision. I need to sort that
out pronto.

Francis has a great idea wherein he did an install with a snapshot dvd
image and that may be a good way to go as a starting point *before* any
attempt to build the kernel etc. 

Dennis

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