Intel D2500CC motherboard and strange RS232/UART behavior

[Lev Serebryakov]

Hello, Poul-Henning.
You wrote 12 апреля 2013 г., 1:37:48:

>>These are multiport cards and something like puc or digi, etc. is fine for
>>those.  The OP's issue is that he has a board with 4 independent 16550
>>UARTs which are attempting to share IRQs.  Those are not multiport cards
>>and are thus a separate issue.
PHK> I think you are mistaken, the 4 uarts are in the same chip and I am
PHK> sure they have done something sensible with the interrupts so they
PHK> can be shared.
 Maybe physically, it is one chip (I'm sure, it is), but they are
detected as completely independent devices, each with its own I/O port
and interrupt... Multiport cards typically group access to "logic"
16550 registers...

-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>