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Re: MMU questions?

To: Jesús Cea Avión <jcea@argo.es>
Subject: Re: MMU questions?
From: Michael Schwingen <rincewind@tubul.dascon.de>
Date: Wed, 3 Jun 1998 19:54:21 +0200
Cc: MiNT mailing list <mint@atari.archive.umich.edu>
In-reply-to: <357540BD.136E48A1@argo.es>; from Jesús Cea Avión on Wed, Jun 03, 1998 at 12:25:33PM +0000
References: <Pine.BSI.3.96.980603004329.2439B-100000@usr02.primenet.com> <357540BD.136E48A1@argo.es>

On Wed, Jun 03, 1998 at 12:25:33PM +0000, Jesús Cea Avión wrote:

> MMU. Devices don´t know. So you can´t use virtual memory for DMA audio
> playing/Hard Disk or Video Memory for the Videl. AFAIK, ALT/TT Ram
> distintion is to allow the system to know about memory that can´t
> allocate for such things.

Actually, you *can* do DMA etc. in virtual memory - however, the driver
which handles the device doing DMA must be VM-aware and translate logical to
physical addresses when programming the DMA controller.

cu
Michael
-- 
Michael Schwingen, Ahornstrasse 36, 52074 Aachen

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  - From: Julian Reschke-FJR010 <Julian_Reschke-FJR010@email.mot.com>

References:
- MMU questions?
  - From: Katherine L Ellis <kellis@primenet.com>
- Re: MMU questions?
  - From: "Jesús Cea Avión" <jcea@argo.es>

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