Subject: Re: aha1542.c DMA problem
To: Torsten Duwe <duwe@immd4.informatik.uni-erlangen.de>
From: Manuel Bouyer <bouyer@ensta.fr>
List: current-users
Date: 04/15/1994 22:11:17
>
> 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.
You're certainly rigth. Y've changed my bios setup, and the scsi seems to
work better. Thanks for your help.
--
Manuel Bouyer, Ecole Nationale Superieure de Techniques Avancees, Paris
email: bouyer@ensta.fr
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