Serial console (Documentation/serial-console.txt). Run a null modem to
a second machine and capture it there, even an 8086 running DOS 2 will
do the job. And before you ask, no we cannot save the log somewhere
and pick it up later. There was a recent thread on this and PC's do
not have anywhere safe (disk I/O is not safe in a panic) and reliable
(most BIOS's clear or corrupt memory on boot) to store the log.
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