Debug over serial

[Nobody III]

I have a serial cable and have connected two computers with it, but I
haven't been able to figure out how to obtain Genode's boot output. I am
currently using the fiasco kernel but I will probably later use fiasco.oc
and possibly nova. I heard something about telling the kernel which port to
use for the serial output. What do I need to do to look at Genode's boot
output over serial?
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