[Bug 216123] ofwfb: r269278 broke booting on Power Mac G4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216123

--- Comment #4 from Tom Lane <tgl at sss.pgh.pa.us> ---
(In reply to Kevin Bowling from comment #2)
> Can you set 'sysctl debug.debugger_on_panic=1' and see if you can get a better idea
> where it dies from the db> prompt or by switching to kgdb from that?

I couldn't figure out how to do that using the Open Firmware boot loader --- it
doesn't understand sysctl, AFAICT.  I tried the -d kernel switch but it didn't
change anything.

This machine lacks a serial port, which makes traditional kernel debugging
difficult.  I noticed that its Open Firmware version does support telnet
connections, though.  Is there a way to use that facility for a kernel debug
console?

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