Path: utzoo!utgpu!water!watmath!clyde!rutgers!ukma!sean
From: sean@ms.uky.edu (Sean Casey)
Newsgroups: comp.sys.amiga
Subject: 68030, cacheing, DMA devices
Message-ID: <8179@g.ms.uky.edu>
Date: 2 Feb 88 06:45:35 GMT
Organization: The Leaning Tower of Patterson Office @ The Univ. of KY
Lines: 17


The problem that people have brought up is that a DMA device
will screw up a system running a data cache.  Since the 68030
has an onboard data cache, enabling it would screw up things for
an Amiga, which has several DMA devices.

It seems to me that the chip designers would have considered this.  *I*
would have considered it.  Surely the onboard MMU can be told that certain
pages of memory are not to be cached.  Could someone who has the specs
for the processor check this out?


-- 
--  Sean Casey               sean@ms.uky.edu,  sean@ukma.bitnet
--  (the Empire guy)         {rutgers,uunet,cbosgd}!ukma!sean
--  University of Kentucky in Lexington Kentucky, USA
--  "If something can go will, it wrong."