On Wed, 13 Nov 2002, Nakajima, Jun wrote:
>
> The one instance I saw was that the BIOS was reading 8254 in a tight loop
> for a calibration purpose, and it was assuming the time proceeded in a
> constant speed, to exit the loop. In other words, it never assumed it could
> get interrupts. To vm86, interrupts are invisible, but they have impacts on
> the actual speed.
That sound slike a perfectly ok thing to do - apart from the hw latching
which might confuse the kernel.
When enabling the local APIC, Linux doesn't actually disable legacy PIT
interrupts, so again I don't really see what the apparent connection
between the hang and the APIC is. So I'd still suspect it's more
timing-related than anything else.
Linus
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:31 EST