Subject: Re: aha1542.c DMA problem
To: None <>
From: Torsten Duwe (Emacs) <>
List: current-users
Date: 04/15/1994 18:57:00
Manuel Bouyer writes:
 > Hi,
 > i've got a problem whith the aha1542.c driver.
 > sometines, all works fine.
 > sometimes, i get from aha0 a 'aha0: DMA beyond end of ISA' (depending on
 > how the malloc was performed, i think)
 > as i've only 16 Meg RAM
 > I am doing something wrong ?
 > I'm using the tar_files of Apr 10 (aha1542.c is Apr  9)
 > Here is what i get at boot: 
 >  CPU: i486DX (486-class CPU)
 >  real mem  = 16646144
 >  avail mem = 14553088
Here's my guess: Your real mem seems to be full 16M minus 128k of shadow ram
(Main+Video BIOS ?), so your chipset obviously is able to "remap" unused RAM
otherwise hidden in the 384k adaptor ROM space to the end of mem, which then
extends 16M.