Messages in this thread | | | Subject | Re: apic and 8254 wraparound ... | From | Alan Cox <> | Date | Fri, 24 Dec 2004 19:40:38 +0000 |
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On Gwe, 2004-12-24 at 20:00, Herbert Poetzl wrote: > somehow I'm unable to locate it, I can see the > 430TX and 430HX but not the 430NX and 430LX ... > > do you have an url for me?
Not to hand, its under the retired chipset stuff. The details are as follows from memory
When you read one 8bit value from an 8254 timer the values latch for read so that when you read the other half of the 16bit value you get the value from the moment of the first read. On neptune that didn't work right so you got halves of two differing samples. That means the error would be worst case a bit under 300 (257 for the wrap + a few for timing)
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