From:	Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DMA transfer
Date:	Tue, 04 Nov 1997 12:43:28 +0100
Organization:	Lehrstuhl fuer Stroemungsmechanik
Lines:	35
Message-ID:	<345F0A60.FE25AED@LSTM.Ruhr-UNI-Bochum.De>
References:	<199711040117 DOT KAA11803 AT asd DOT tnes DOT nec DOT co DOT jp>
NNTP-Posting-Host:	c64.lstm.ruhr-uni-bochum.de
Mime-Version:	1.0
CC:	satoh AT asd DOT tnes DOT nec DOT co DOT jp
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

satoh AT asd DOT tnes DOT nec DOT co DOT jp wrote:
> 
> Hello all,
> 
> I'm writing a NIC board driver using gcc compiler (DJGPP V2).
> I allocate memory on PC's memory using malloc() function and
> I have to set the physical address to register of the board.
> ( This board performs PCI bus master device.)
> But malloc() function returns virtual memory address, and I
> have no idea to translate malloc'ed virtual memory address into
> physical address.
> 
> Does anyone know how to allocate DMAable large memory on PC
> and translate the virtual memory address into physiacal address.
On
ftp://x2ftp.oulu.fi/pub/msdos/programming/djgpp2/
I saw something about doing DMA with a soundblaster, IIRC
it was in gccfaq10.zip, but I might be wrong. 
It explained the methods quite good and had an example of
programming a soundblaster.

-- 
Ciao
Tom

*************************************************************
* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
* Universitaetsstr. 150                                     *
* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
* Fax: +49 234 709 4162                                     *
* http://www.lstm.ruhr-uni-bochum.de/~demmer                *
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