Date: Sat, 29 Mar 2003 16:37:39 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: john@utzweb.net Cc: freebsd-mobile@FreeBSD.ORG Subject: Re: would a PCCard Sound device have insurmountable problems? Message-ID: <20030329.163739.02425772.imp@bsdimp.com> In-Reply-To: <86el4z16g4.wl@utweb.net> References: <86el4z16g4.wl@utweb.net>
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In message: <86el4z16g4.wl@utweb.net>
"John L.Utz III" <john@utzweb.net> writes:
: I am thinking about purchasing an ESS688 based PCMCIA soundcard for
: my laptop.
I don't think there's any pcmica soundcard support in FreeBSD at the
moment.
: I'm buying it for the midi part ( yes, i know that we dont have working
: midi, but i dork around with the driver from time to time ).
:
: In order to support the midi in function, it would need two irq's.
:
: can we do 2 irq's yet?
No. PCMCIA cards only have 1 IRQ. There's only 1 INT pin. There's
some other signalling for bad battery and such that some cards abuse
as a second interrupt, but we don't really support that at the moment.
: are there other issues with going thru the pccard slot that would cause
: noticable audio latencies?
DMA isn't supported for 16-bit pcmcia cards either. The bridges
require some funky setup to make this happen, and it is very bridge
dependent, iirc.
These are solvable problems, but aren't solved problems.
Warner
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