SMP (IO-APIC??) weirdness

Linux Lists (lists@cyclades.com)
Wed, 7 Jul 1999 16:40:50 -0700 (PDT)


Hello,

Two cases:

(1) Dell PowerEdge 1300, Dual P-II/400, 64MB RAM (local system).
Cyclom-8Yo ISA card (a multiport serial card).
Cyclades driver 2.2.2.3_SMP_2 (experimental).

In this case, the Cyclom-Y card works just fine, being able to communicate
with the standard serial port.

(2) Dell PowerEdge 2300, Dual P-II/400, 256MB RAM (client system).
Cyclom-8Yo ISA card.
Cyclades driver 2.2.2.3_SMP_2 (experimental).

In this case, /proc/interrupts does not see any interrupts being generated
by the Cyclom-Y card, even though the IRQ is registered by the driver
(i.e., it's listed in /proc/interrupts, yet with '0' interrrupts
generated).

If kernel is compiled as UP, the Cyclom-Y works fine, using the _same_ IRQ
that it tried to use on the SMP kernel.

I'm suspecting of a hardware issue here (something related to the IO-APIC
and the Cyclades ISA card, or something in this line), but I'm not sure.

Comments ?? Hints ?? Suggestions ??

Any help would be appreciated.

Regards,
Ivan Passos

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