From owner-freebsd-doc Thu Apr 27 7:43: 7 2000 Delivered-To: freebsd-doc@freebsd.org Received: from pluton.univ-troyes.fr (pluton.univ-troyes.fr [193.50.230.240]) by hub.freebsd.org (Postfix) with ESMTP id 9426C37B965 for ; Thu, 27 Apr 2000 07:42:48 -0700 (PDT) (envelope-from stanislav.koschinsky@univ-troyes.fr) Received: from koschins.univtroyes.fr (kolokolov.univ-troyes.fr [193.50.230.246]) by pluton.univ-troyes.fr (8.9.1a/jtpda-5.3.1) with SMTP id QAA22123 for ; Thu, 27 Apr 2000 16:39:14 +0100 (WET DST) Message-ID: <000801bfb056$939ed800$f6e632c1@univtroyes.fr> From: "Koschinsky Stanislav" To: Subject: Maybe need to be corrected? Date: Thu, 27 Apr 2000 16:40:19 +0200 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01BFB067.462AE6C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 Sender: owner-freebsd-doc@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org This is a multi-part message in MIME format. ------=_NextPart_000_0005_01BFB067.462AE6C0 Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: quoted-printable Hello! My name is Stanislav Koschinsky. 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. With best regards, S.Koschinsky. e-mail: koschinsky@univ-troyes.fr ------=_NextPart_000_0005_01BFB067.462AE6C0 Content-Type: text/html; charset="koi8-r" Content-Transfer-Encoding: quoted-printable
Hello!
My name is Stanislav = Koschinsky.
I've read the part of FreeBSD book 21.3 = "DMA: What=20 it is and how it works". I like it very much. But I suppose that there = is a=20 mistakes (or misprints maybe) in descriptions of "DMA Address and Count=20 Registers" and "DMA command registers". The numbers of registers does = not=20 correspond ones that are in the description of IBM compaitible XT = computer.=20 (DMA Registers: 0x2, 0x4, 0x6 etc.)
 
I think there should be something like=20 this:
 
0x0 write/read Channel 0 = starting/current=20 address
0x2 write/read Channel 1 = starting/current=20 address
0x4 write/read Channel 2 = starting/current=20 address
0x6 write/read Channel 3 = starting/current=20 address
0x1 write/read Channel 0 = starting/remaining=20 byte count
0x3 write/read Channel 1 = starting/remaining=20 byte count
0x5 write/read Channel 2 = starting/remaining=20 byte count
0x7 write/read Channel 3 = starting/remaining=20 byte count
 
0x8 write/read command = register
0x9 write request register
...
Please, verify the = numbers.
 
 
With best regards,
S.Koschinsky.
e-mail: koschinsky@univ-troyes.fr
 
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