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From: Guilhem Ensuque <guilhem.ensuque@bt-sys.bt.co.uk>
To: "'Luigi Rizzo'" <luigi@labinfo.iet.unipi.it>,
        "'multimedia@FreeBSD.ORG'" <multimedia@FreeBSD.ORG>
Subject: [FBSD-multimedia] RE: Dell latitude sound.... (fwd)
Date: Mon, 14 Dec 1998 09:24:34 -0000
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Hi Luigi
Hi all

Sorry to be a pain but I have a newbie question...

How do you apply patches? what is the syntax of the command?

I have been trying to get the CS4237b working on my Dell Latitude for
two weeks now and am on the verge of nervous breakdown, so this may save
my life ... :)

Guilhem

>-----Original Message-----
>From:	Luigi Rizzo [SMTP:luigi@labinfo.iet.unipi.it]
>Sent:	13 December 1998 15:16
>To:	multimedia@FreeBSD.ORG
>Subject:	Re: Dell latitude sound.... (fwd)
>
>As Soren noticed, the BIOS in the Dell Latitude laptop maps the codec
>registers of the CS423x at 0x530 -- this is a bit unusual because these
>registers are usually at 0x534 (0x530 is the offset for the
>configuration registers, which are not present in most modern
>boards...).
>
>For historical reasons, the "pcm" driver looks for the codec registers
>at ioaddr+4, so in order to find the codec ion the Dell and probably
>other machines you either need to specify the base address as 0x52c, or
>apply the following patch to sys/i386/isa/snd/ad1848.c
>
>	cheers
>	luigi
>
>
>    int
>    mss_detect(struct isa_device *dev)
>    {
>	int             i;
>	u_char   tmp, tmp1, tmp2 ;
>	snddev_info *d = &(pcm_info[dev->id_unit]);
>	char *name;
>+	int retry = 1 ;
>+
>+ again:
>	d->io_base = dev->id_iobase;
>	d->bd_flags |= BD_F_MCE_BIT ; 
>
>...
>
>    for (i=0; i<10; i++)
>        if (inb(io_Index_Addr(d)) & IA_BUSY)
>            DELAY(10000); /* maybe busy, wait & retry later */
>        else
>            break ;
>    if ((inb(io_Index_Addr(d)) & IA_BUSY) != 0x00) {    /* Not a AD1848
>*/
>+	if (retry) {
>+	    retry = 0 ;
>+	    dev->id_iobase = dev->id_iobase - 4 ;
>+	    goto again ;
>	}
>        BVDDB(printf("mss_detect error, busy still set (0x%02x)\n",
>                   inb(io_Index_Addr(d))));
>        return 0;
>    }
>
>
>
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