From owner-freebsd-hackers  Sun Apr 30 15: 9:10 2000
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Date: Sat, 29 Apr 2000 15:04:31 +0100
From: Nik Clayton <nik@freebsd.org>
To: Koschinsky Stanislav <stanislav.koschinsky@univ-troyes.fr>
Cc: doc@freebsd.org, hackers@freebsd.org
Subject: Re: Maybe need to be corrected?
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In-Reply-To: <000801bfb056$939ed800$f6e632c1@univtroyes.fr>; from stanislav.koschinsky@univ-troyes.fr on Thu, Apr 27, 2000 at 04:40:19PM +0200
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Stanislav,

I'm replying to this and including the -hackers list, in the hope
that someone can confirm this.  Thanks for getting in touch.

N

On Thu, Apr 27, 2000 at 04:40:19PM +0200, Koschinsky Stanislav wrote:
> I've read the part of FreeBSD book 21.3 "DMA: What it is and how it 
> works". I like it very much. But I suppose that there is a mistakes (or 
> misprints maybe) in descriptions of "DMA Address and Count Registers" 
> and "DMA command registers". The numbers of registers does not 
> correspond ones that are in the description of IBM compaitible XT 
> computer. (DMA Registers: 0x2, 0x4, 0x6 etc.)
> 
> I think there should be something like this:
> 
> 0x0 write/read Channel 0 starting/current address
> 0x2 write/read Channel 1 starting/current address
> 0x4 write/read Channel 2 starting/current address
> 0x6 write/read Channel 3 starting/current address
> 0x1 write/read Channel 0 starting/remaining byte count
> 0x3 write/read Channel 1 starting/remaining byte count
> 0x5 write/read Channel 2 starting/remaining byte count
> 0x7 write/read Channel 3 starting/remaining byte count
> 
> 0x8 write/read command register
> 0x9 write request register
> ...
> Please, verify the numbers.

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