On Sun, 12 Jun 2005, Jerome Glisse wrote:
Hi,
After many tests and reboot i have a set of register that
may influence 9800 lockups. Unfortunetly i don't know
how to play with this register as they doesn't seems to be
used anywhere (nor X driver, dri, drm if i trust my grep :))
RADEON_LATENCY the most likely to help to resolve the
lockup. After a cold reboot i read 0x40 in it. I would like to
read 0xff but it seems to be read only and after writing to
some random place near it i can't figure out how to setup
it.
What does this regs do :
RADEON_BIOS_6_SCRATCH
This is a scratch register - basically just a 32 bit piece of memory. It
is used by video BIOS during startup, since BIOS cannot be certain
whether main memory have been properly initialized and it is certain that
video memory was not.
Also, AFAIK, it is used by video BIOS to store some values (perhaps mode
information ?)
RADEON_MDGPIO_Y_REG
On R300 this is a VIP bus register, should have nothing to do with 3d.
Also, I would generally suggest to not play with any register with GPIO in
the name, unless you have very good reason to. A wrong value written could
damage your card.
The reason is that GPIO often refers to general purpose input. So if you
accidentally enable an output that is used as an input pulled low and then
write 1 there you will get a short circuit.
best
Vladimir Dergachev
As this regs appear in radeon reg i hope that some one
with the radeon specs on it could give me anyclue on
how to play or what is there meanings.
Thx
Jerome Glisse
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