Bruce Evans writes:
> Possible causes of the problem:
> 1) isa_handle_intr() claims to send specific EOIs (0x30 | irq) but
> actually sends non-specific ones (0x20 | garbage). Since interrupts
> may be handled in non-LIFO order, this results in EOIs being sent
> for the wrong interrupts. I think this just randomizes the
> brokenness caused by delaying sending of EOIs. I can't see how it
> would result in an EOI being lost -- the right number of EOIs will
> have been sent after all handlers have returned.
I think that sending non-specific EOIs is the problem. Sending
specific EOIs seem to eliminate my nic timeouts and the need to
manually feed an eoi to recover from a missing interrupt.
My question is: how does one send a specific EOI correctly? I don't
have decent documentation for this. Above, you seem to imply that
0x30 is a specific EOI. That does not seem to work for me (machine
locks at boot).
Linux uses 0xe0. According to some Tru64 docs I have,
that means "Rotate Priority on specific EOI". According
to that same documentation, 0x60 is a specific EOI. Both of these
appear to work just fine. What should the alpha port use?
Thanks,
Drew
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