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From:	"rickbronson AT gmail DOT com" <rickbronson AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: freedos and cwsdpmi with djgpp under Linux?
Date:	Tue, 18 Aug 2009 10:04:56 -0700 (PDT)
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> Are you running your app in a dos window under Linux, or on a plain
> DOS machine?

  A plain DOS machine running FREEDOS.

> In other words, I never do that, I just
> let the stub load CWSDPMI (found in my %PATH%) if needed.

  I've tried many number of methods to make this work.  I picked just
one above.

> If you absolutely need an XMS block, you need to
> "prepare" for it before running CWSDPMI (such as
> allocate the block you need, allocate a second tiny block,
> release the first block).

  I don't suppose you have an example of this method?

  Basically I need a 1 Megabyte DMA buffer for a PCI card that has DMA
capability.

  I got both cwsdma.zip and cwsdma2.zip, thanks for passing those
along.  When I run #2 I get:

Allocated 8M DMA buffer at DJGPP address 0x93b00, physical 0x113b00
Virtual: 0x1000  Physical: 0x100000  Size: 0x13000
Virtual: 0x91000  Physical: 0x916000  Size: 0x1000
Virtual: 0x92000  Physical: 0x914000  Size: 0x1000
Virtual: 0x93000  Physical: 0x113000  Size: 0x1000
Virtual: 0x94000  Physical: 0x115000  Size: 0x7ff000
Virtual: 0x893000  Physical: 0x114000  Size: 0x1000
Virtual: 0x897000  Physical: 0x915000  Size: 0x1000

  Looking at the Physical address, it's apparent that they are not
contiguous.  If I used XMS would I get a contiguous one?

  Thanks very much for all the help!

  Rick

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