Cirrus Logic CL-GD6420 DRAM detection problem. Help needed

Cirrus Logic CL-GD6420 DRAM detection problem. Help needed

Post by Jean-Louis Thiro » Fri, 12 Jul 1996 04:00:00

Hi Everydody,

I am running Linux on a PCI motherboard, with a CL-GD6420 graphic cards (1Mb).
This cards is fully supported as far as I know.
For some unknown reason, I cannot get it working. It does produce a black
screen when I am using the (right) cl6420 driver.
When using the generic driver, it works but only on the VGA16 server and
with a low resolution. At higher resolution or with the SVGA server,
the result is a bad display with duplication of image. It get worth if I
increase the resolution.
The maximum of pixels I can have is about 425000 with 4bpp (And I have a 19"
monitor, so it can be taken as an acceptable resolution). This rougly
corresponds to 256K of VideoRam.
Of course I tried to force VideoRam detection (as X -probeonly indicates
effectivelly 256k) in the config file, but it did not change anything.
I also tried to add MemBase with many adresses, but with no results.
scanpci does not run correctly (it scratches and I have to hard reset).

Any idea ???

Thank you if you can help me.

PS: to be complete, I must tell does the clmode.exe dos utility does only
detect 512k DRAM on the card. I don't know how reliable is clmode, and still,
512 is not 256k. Moreover, why the generic driver does work but not the cl6420


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