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From: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
Message-Id: <199708181041.MAA10169@labinfo.iet.unipi.it>
Subject: Re: Problem with my Wincast, fxtv
To: hasty@rah.star-gate.com (Amancio Hasty)
Date: Mon, 18 Aug 1997 12:41:43 +0200 (MET DST)
Cc: msmith@atrad.adelaide.edu.au, terry@lambert.org, mestery@winternet.com,
        freebsd-multimedia@FreeBSD.ORG, current@FreeBSD.ORG
In-Reply-To: <199708180405.VAA03040@rah.star-gate.com> from "Amancio Hasty" at Aug 17, 97 09:04:53 pm
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> Please, post proposed changes to the multimedia mailing first so at 
> the very least the multimedia group can present a unified consesus
> agreement .

the code is in the README file of my last snap (and I thought I also
posted it explicitly, if I didn't it was just by mistake).

At any rate the code is as follows:

/*
 * this stops the dma channel and returns the residual count 
 * derived calling isa_dmastatus
 */
int isa_dmastop(int chan) 
{
    if (dma_inuse & (1 << chan) == 0)
        printf("isa_dmastop: channel %d not acquired\n", chan);  
    if (dma_busy & (1 << chan) == 0)
        printf("isa_dmastop: channel %d not acquired\n", chan);
    if ((chan & 4) == 0)
        outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
    else
        outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
    return isa_dmastatus(chan);
}

I am not at all concerned on the presence of the checks in the
first two lines (since if the channel is already disable then there
is no problem anyways).

	CHeers
	Luigi