From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue,  8 Aug 1995 16:39:16 -0400
From: forsyth@plan9.cs.york.ac.uk forsyth@plan9.cs.york.ac.uk
Subject: pc file server kernel: caveats
Topicbox-Message-UUID: 14d01814-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19950808203916.lW7GojCr0qzlGEFcqt7BNj8jpaXILl_QijTnB-KBQ-w@z>

the pc file server kernel's ether509 driver needs similar changes
to /sys/src/9/pc/ether509.c: specifically, it needs to loop until
there aren't any more interrupts waiting.  otherwise, under load
it can suddenly stop seeing further interrupts and things time out.
i have the impression that this is more likely to happen with the
newer 3c509b than with the original 3c509.

the pc file server decides my 16 Mbyte AMD486dx4/100 (no-obvious-name clone) motherboard
has 256 Mbytes (would be nice).  not surprisingly, it then blows up in iobufinit.
i've no idea what the m/board is doing that causes the probe
not to detect that the memory subsystem has wrapped the
addresses; perhaps this board doesn't do the usual thing.
it's happy if the probe is limited to 128 Mbytes.