Date: Tue, 10 Mar 1998 07:43:19 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: garycorc@idt.net (Gary T. Corcoran) Cc: adhir@worldbank.org, multimedia@FreeBSD.ORG Subject: Re: sound in -current Message-ID: <199803100643.HAA08610@labinfo.iet.unipi.it> In-Reply-To: <3504E04D.DCAF67ED@idt.net> from "Gary T. Corcoran" at Mar 10, 98 01:39:54 am
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> I never had time to write up a proper report on this, but when I was trying > to get sound going on my notebook PC, I found that when (at first) I had > the two DMA channels reversed in my config file (since I didn't know which > was which in Luigi's driver) my machine locked solid when I tried to play > a sound file. Reversing the DMA's fixed the problem. Did something change what do you mean by "DMA chan reversed", and, especially, what hardware caused the problem ? > about a possible conig error, but not a lockup. Could you perhaps detect > this situation, Luigi? When I get some more time I'll write up some i'll do my best... the thing is, two buffers are allocated in the driver, and the 8237 is started on both channels. "Reversing" the channels as you claim should have the effect that write dma request go to a 8237 channel programmed for reads, so the request is not honored (probably) by the 8237. Then what could happen is that the soundcard is continuously issuing request causing some kind of freeze on the ISA bus ? detecting the problem is very card specific though... cheers luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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