Date: Tue, 26 Apr 94 09:37:19 -0400
From: dj AT ctron DOT com (DJ Delorie)
To: CHAHL AT rsbs-central DOT anu DOT edu DOT au
Cc: DJGPP AT sun DOT soe DOT clarkson DOT edu
Subject: Re: Access to physical locations in protected mode


>                I am attempting to interface a frame grabber card to a
>  GCC program. The problem is that the card is memory mapped to
>  somewhere (software selected) above 10MB. How do I force this
>  region to be allocated so it can be accessed using pointers ?

In DPMI mode, you can use DPMI calls to get a selector that points to
this memory range, and use farptr or movedata() to access it.

In non-DPMI mode, you can try adding 0xe0000000 to the physical
address and go32 may map it for you.