[OpenBIOS] suggestion on ordering things

[David Christensen]

If you're looking for an idea on what to do during BIOS power-on self-test
(POST) you may start with this link:
http://www.phoenix.com/pcuser/userman.pdf

Starting on page 35 you'll get a listing of POST codes and approximately
what occurs at each code.  Unfortunately the codes are listed in numerical
order, not the order that they occur, but you should be able to figure out
which codes require RAM and which don't.  Memory sizing occurs at POST code
28h, then you probably want to initialize RAM very soon afterwards by
writing a known value to every memory location to clear up any parity/ECC
errors that may be present because the contents of DRAM are not known at
power-up.

Dave

-----Original Message-----
From: owner-openbios at elvis.informatik.uni-freiburg.de
[mailto:owner-openbios at elvis.informatik.uni-freiburg.de]On Behalf Of
Ronald G. Minnich
Sent: Monday, February 14, 2000 7:37 AM
To: openbios at elvis.informatik.uni-freiburg.de
Subject: [OpenBIOS] suggestion on ordering things


I think memory startup should happen first or early. On the new machines
you can't use ram til you power on memory.

ron

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