Date: Thu, 18 Mar 1999 14:26:39 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: "Peter S'heeren" <petersh AT pimc DOT be>
cc: djgpp AT delorie DOT com
Subject: Re: Addressing physical memory
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On Thu, 18 Mar 1999, Peter S'heeren wrote:

> I have a problem with accessing physical memory. I wanna do this: (1)
> allocate some physical memory pages (address isn't important, pages may
> be continguous), (2) determine their physical address, (3) pass these
> addresses to a bus-master capable PCI card that tries to read data from
> these addresses (experimental hardware).

Did you read section 18.14 of the DJGPP FAQ list (v2/faq211b.zip from
the same place you got DJGPP)?  I think it has some solutions for such 
cases.  If something in that section is unclear, please ask specific 
questions here.