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From: geert@fozzie.sun3.iaf.nl (Geert Bosch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: FAQ: Mach-64 problems and solutions for them (READ THIS!)
Date: 11 Mar 1996 15:43:46 +0100
Organization: La Calandre Infortunee
Lines: 45
Message-ID: <4i1e72$o9@fozzie.sun3.iaf.nl>
NNTP-Posting-Host: fozzie.sun3.iaf.nl
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Since there keep coming so many questions of users who have one of the problems
described below, I decided to post this FAQ to c.u.b.f.m again. Note that you
can also find this (nicely HTML-ed, thanks for that BTW) at http://www.freebsd.org
Q: When I boot FreeBSD with my ATI Mach 64 videocard the following happens:
when the system probes the hardware during boot the screen goes black
and synchronization is lost and I'm not even using X! What's the problem?!
A: The problem is that the ATI Mach 64 uses address 2e8, and the fourth serial
port does too. Due to a bug (feature?) in the sio.c driver it will
touch this port even if you don't have the fourth serial port, and
*even* if you disable sio3 (the fourth port) which normally uses this
address.
Q: What's the solution or workaround for this problem?
A: Until the bug has been fixed, you can use this workaround:
1. Enter -c at the bootprompt.
[ the kernel goes into configuration mode ]
2. Disable sio0, sio1, sio2 and sio3 (all of them).
This way the sio driver doesn't get activated -> no problems.
3. Type exit to continue booting.
Q: The workaround works fine, but now I want to use my serial ports.
A: You'll have to build a new kernel with the following modification:
in sio.c (/usr/src/sys/i386/isa/sio.c I believe) find the one
occurrence of the string 0x2e8 and remove that string and the
preceding comma (keep the trailing comma).
Now follow the normal procedure of building a new kernel.
Q: Now everything runs great, except for X Windows: my screen goed black
or X Windows runs but with all kinds of problems.
A: Some newer ATI Mach 64 video cards (notably ATI Mach Xpression) do not
run with the current version of XFree86. You can get a beta-version of
a new X-server that works better, by looking at http://www.xfree86.org
and following the links to the new beta release. Get the following
files:
AccelCards, BetaReport, Cards, Devices, FILES, README.ati,
README.FreeBSD, README.Mach64, RELNOTES, VGADriver.Doc,
X312BMa64.tgz
Replace the older files with the new versions and make sure you
run xf86config again.
--
E-Mail: geert@sun3.iaf.nl *** Lbh whfg penpxrq ZvpebFbsg'f ***
Phone: +31-53-4303054 ** arj naq vzcebirq frphevgl flfgrz. **