Re: odd timer bug, similar to VIA 686a symptoms

[Vojtech Pavlik]

On Wed, May 29, 2002 at 01:46:27PM +0100, Alan Cox wrote:
> On Wed, 2002-05-29 at 10:25, Neale Banks wrote:
> >> May 28 11:19:54 gull kernel: timer.c: VIA bug check triggered. Value read 65500 [0xffdc], re-read 65485 [0xffcd]
> > May 28 11:19:55 gull kernel: timer.c: VIA bug check triggered. Value read 65500 [0xffdc], re-read 65486 [0xffce]
> > May 28 11:19:56 gull kernel: timer.c: VIA bug check triggered. Value read 65500 [0xffdc], re-read 65486 [0xffce]
> > May 28 11:19:57 gull kernel: timer.c: VIA bug check triggered. Value read 65499 [0xffdb], re-read 65484 [0xffcc]
> > May 28 11:19:58 gull kernel: timer.c: VIA bug check triggered. Value read 65497 [0xffd9], re-read 65483 [0xffcb]
> > 
> > Anyone got any good theories what's going on here, given that this is a
> > ~1995 vintage laptop with a Pentium-120 (which I'm assured doesn't have a
> > VIA 686a ;-)?
> 
> Neptune chipsets at least had latching bugs on timer reads. What chipset
> is the laptop ?

This is unlikely to be the latching bug - note the values are near to
65535 - that means the timer is reprogrammed to count from 0xffff down
instead from LATCH. That is because of the suspend I presume. What's
weird is that the VIA fix doesn't program it to the correct value, or
perhaps is that missing from the patch?

-- 
Vojtech Pavlik
SuSE Labs