Re: atyfb and 8500+ATI RagePro

As an FYI, 29498928 does work with my PB G3 Series 300mhz; I can boot
with video=atyfb:vmode:14,cmode:32,mclk:83.

Sometimes, though, the console speed is really slow, but if I boot and
exit X, either Xpmac or XF68_FBDev, it becomes faster.  Also, I am
getting the little vertical snow band mentioned below when running X.

I'm using a 2.2.8 kernel I built from CVS source from openprojects
yesterday.

Hugh


"Timothy A. Seufert" wrote:

At 4:48 PM +0200 5/6/99, Geert Uytterhoeven wrote:

quoted

Hence the problem lies within the programming of the pixel and memory

clocks.

Could it be the same reference clock problem I was having?  (I need to

sit

down and write some code to parameterize the reference clock.)

Mike, could you try the following change to atyfb.c? (without any

other

patches applied):

Find where ref_clk_per is defined.  I don't have the source in front

of me

at the moment, but it will look something like:

unsigned long int ref_clk_per = 1000000000000UL/14318180;

This line sets atyfb's notion of the frequency of the card's reference

clock (from which all others are derived) to 14.318180 MHz.  Please

try

changing 14318180 to 29498928 and 28636360 to get 29.499 and 28.636

MHz

respectively.

I discovered that my Rage Pro card has a 29.498928 MHz reference

clock, and

had some of the same symptoms as you (can't boot unless mclk is set

low).

Once I set the reference clock to 29.499 MHz atyfb started working a

lot

better (though I do get some snow in a thin vertical band near the

left

side of the screen whenever video memory is being written).

I received similar advice from Geert yesterday.  Indeed it helps with my

problem,
as I too have a card with a reference clock at 29.498 Mhz.  I also get
the same small
amount of snow down the penguin centerline during video activity.

Since the initial success, I have noticed that with actual use, I have
various
problems (thin colored line at boot which goes away with the console,
blanking and of the console display, etc.) so I think more remains to be

done.

I duplicated the DEBUG dump block so that I get a before and after
picture of the
card setup on boot:

MacOS display is /bandit/ATY,XCLAIMVRPro
atyfb: 3D RAGE PRO (BGA, PCI) [0x4749 rev 0x7c] 12M SGRAM, 230 MHz PLL,
100 Mhz
MCLK
BUS_CNTL DAC_CNTL MEM_CNTL EXT_MEM_CNTL CRTC_GEN_CNTL DSP_CONFIG
DSP_ON_OFF
7b33a040 87010182 00651a7b 75130c01     03000200      0038064a
0118061f
PLL ad d5 44 64 e4 13 80 91 8e 9e 29 01 a6 1b 00 00
BUS_CNTL DAC_CNTL MEM_CNTL EXT_MEM_CNTL CRTC_GEN_CNTL DSP_CONFIG
DSP_ON_OFF
7b23a040 87010182 00751a7b 75130c01     03000200      003a0660
063500c0
PLL ad d5 41 14 dc 03 00 8a 8e 9e 29 01 a6 1b 00 00
Console: switching to colour frame buffer device 160x60
fb0: ATY Mach64 frame buffer device on /bandit/ATY,XCLAIMVRPro
Monitor sense value = 0x73f, using video mode 6 and color mode 0.
fb1: control display adapter

mike.



--
"Brain-eating mutants are bad for business..." - Battle Angel
Hugh "Batmensch" Caley


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