Ar Gwe, 2006-08-11 am 12:08 +0100, ysgrifennodd Chris Pringle:We don't use any kind of power management (not compiled in) as our systems are always on... Is there any timing related options in the kernel config you'd recommend I look at?
Unlikely as it would affect both. More likely would be that the ISA busThats interesting, but wouldn't this produce strange side affects for the 2.4 kernel as well? 2.4 works fine on both VIAs and Celerons.
clock is generated off the PCI bus clock and you have one of the
multipliers wrong or too high for the board.
That I wonder about. The power management stuff and some other things
that matter for timing are different however.
Okay, I've tried disabling both preemption and interrupts (separately, and together) and its still hanging...I'll give the interrupt disabling a go...
Its just a guess but if you have low latency stuff, you have pre-empt
enabled and you actually depend upon the semantics of inb_p/outb_p
giving delays reliably then I'm not convinced are guarantees are strong
Specifically we don't have any pre-empt protection between the I/O delay
and the I/O so we could violate it as we don't have pre-empt disables in
inb_p/outb_p and if your CPU context switch is quick enough it could
trigger a problem.
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