From: Benjamin Herrenschmidt <bh40@calva.net>
To: linuxppc-dev@lists.linuxppc.org,
Geert Uytterhoeven <Geert.Uytterhoeven@cs.kuleuven.ac.be>
Subject: MCLK=100 breaks PowerBook
Date: Mon, 18 Jan 1999 02:19:10 +0100 [thread overview]
Message-ID: <19990118021910.020182@smtp.calvacom.fr> (raw)
In-Reply-To: <Pine.LNX.4.03.9901142334560.17386-100000@mercator.cs.kuleuven.ac.be>
The default mclk setting of 100MHz for the Rage LT-G breaks on my
PowerBook G3 Series (garbage on screen, accelerated X hangs). I added
mclk:83 to my command line and it works fine again (and, progress from
pre-4, I have no more snow in X when moving things around).
>atyfb: 3D RAGE LT PRO [0x4c47 rev 0x80] 4M SGRAM, 230 MHz PLL, 83 Mhz MCLK
the chip ID 0x4c47 should be set to 83 MHz by default, not 100.
Note that I made a typo the first time I tested and I used 88Mhz. it
works fine too.
MacOS ATI driver creates a strange property in the device tree. It's name
is "MCLK,XCLK" and the value is 00001a38 00001a38. Geert, those values
have any meaning to you ? If you tell me how to do, I could calc the MCLK
used by MacOS by peeking appropriate registers from MacsBug and we could
use this value for the kernel with this chipID.
--
E-Mail: <mailto:bh40@calva.net>
BenH. Web : <http://calvaweb.calvacom.fr/bh40/>
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next prev parent reply other threads:[~1999-01-18 1:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.3.96.990114142507.7102A-200000@persephone.cs.nmt.edu>
1999-01-14 22:35 ` new irq.c Geert Uytterhoeven
1999-01-18 1:19 ` Benjamin Herrenschmidt [this message]
1999-01-18 9:00 ` MCLK=100 breaks PowerBook Geert Uytterhoeven
1999-01-18 16:51 ` Cort Dougan
1999-01-18 17:04 ` Geert Uytterhoeven
1999-01-19 0:47 ` Paul Mackerras
1999-01-19 12:35 ` Geert Uytterhoeven
1999-01-18 19:26 ` Choosing an Ethernet controller Benjamin Herrenschmidt
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