I've been looking at the config options in <arch/i386/isa/vector.s> -- 
ICU_SPECIAL_MASK_MODE and AUTO_EOI_[1|2].

Does anyone have experience in how these options interact with various screwy 
chipsets now current?

I'm hassling with the VIA Apollo MVP3 and 586B.  VIA doesn't even document the 
imbedded 8259 clone in the 586B.  I assume that due to PCI, the interrupt 
handling is different from a "real" 8259, which is what I assume the default 
kernel code is supposed to think it has.


--Jim Howard  <jiho@mail.c-zone.net>