I think what we used to say was that you should try to do debugging with
sub-hurds where the console port is faked with io ports (I think).  We
definitely don't want to clutter up ld.so with stuff that is only for
debugging early boot.  I think it would be better to have serverboot supply
a trivial io server on the fd ports it hands to the initial processes, that
translates to console device_write calls in a very simple way.  I may be
misremembering some details of the boot sequence.

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