From:	Chris Holmes <cholmes AT surfsouth DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Accessing memory above an adress of 1MB
Date:	Mon, 09 Aug 1999 07:34:40 -0400
Organization:	Georgia Institute of Technology, Atlanta GA, USA
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Martin Czamai wrote:
> 
> Hello!
> 
> I want to access the memory space given from a BAR (base adress
> register) of a PCI controller. (the adress is dynamic allocated by the
> system)
> Therefore I wrote a function that returns the (absolute) adress that
> has to be accessed. Usually it is around 0xFFFFF000 .
> I used __djgpp_map_physical_memory (mappedBAR, NoBytes, BaseAdr) for
> mapping the device to a created memory block named 'mappedBAR'; the
> number of bytes to map (NoBytes) is a multiple of a mem-page found
> with __dpmi_get_page_size(&NoBytes)  (4096 bytes) and the base adress
> (BaseAdr) is equal the absolute address of the BAR.
> My problem is, that the __djgpp_map_physical_memory (mappedBAR,
> NoBytes, BaseAdr) returns EACCES as errno, wich is a rejection of the
> request to the  DPMI server. What does this message exactly mean?
> Who could help me getting started to access this memory?
> I am using RHIDE 1.4.
> Please send your reply to Martin_Czamai AT peak-service DOT com .
> Thank you!

  Wow... FFFFF000 is pretty near the 4 gig limit.  Unless you have 
4 gig of ram, I think the PCI controller is lying to you.

  Chris

-- 
I know that I will never be politically correct,
and I don't give a damn about my lack of etiquette!
-- Meatloaf

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