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From: "Andrew V. Stesin" <stesin@elvisti.kiev.ua>
Message-Id: <199510271927.VAA09270@office.elvisti.kiev.ua>
Subject: Re: MOXA C104+ 4-port serial card -- runs good for me.
To: bde@zeta.org.au (Bruce Evans)
Date: Fri, 27 Oct 1995 21:27:50 +0200 (EET)
Cc: hardware@freebsd.org
In-Reply-To: <199510271622.CAA20908@godzilla.zeta.org.au> from "Bruce Evans" at Oct 28, 95 02:22:13 am
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# 
# >I couldn't find a way to set where interrupt register lives using
# >flags in sio.c without stupid hacking it (FreeBSD-2.0.5 from CD),
# >and finally I threw this register somewhere to a "safe" unused place,
# >and configured the MOXA card as BOCA
# >card (told sio.c that interrupt register is not present at all).
# >Could I solve this better?
# 
# You solved it right.  BOCA cards have an interrupt register too, but
# it isn't used because no one has written the code to use it and
# using it would be unportable.  Not using the interrupt register
# costs about 20 usec per interrupt to poll all the ports.
# 
	What will be a Good Official Way of making sio.c smart
	about  the location of the interrupt register
	(and this way generalizing support for MOXA, AST-4, ARNET-8,
	BOCA boards -- each have one but at different
	or tunable location)?

	What about two upper bytes of device flags in config
	file with zero value means interrupt register is _really_ missed?

# Bruce
# 


-- 

	With best regards -- Andrew Stesin.

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