Date: Fri, 19 Jul 1996 12:47:51 +1000 From: Bruce Evans <bde@zeta.org.au> To: E00114@vnet.atea.be, alex@fa.tdktca.com Cc: freebsd-hardware@freebsd.org Subject: Re: Multiple COM ports with same IRQ Message-ID: <199607190247.MAA30281@godzilla.zeta.org.au>
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>> ISA boxes can >> have hardware installed (accidentally?) with devices sharing the same IRQ, but >> the drivers cannot deal with it. >The sharing of interrupts between ISA devices is an electrical >constraint. When two devices are attempting to use a common IRQ line, That's why he only wanted to share them for EISA/ISA boxes :-). sio should be able to handle it if the hardware permits level triggered interrupts. It doesn't depend on the trigger level and doesn't have board-specific multiport optimizations (only board-specific initializations for AST boards), so it shouldn't be able to tell the difference between a a bunch of ports connected to the same level triggered IRQ and a nondescript non-AST multiport board. Bruce
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