Subject: Re: bus_dma'ed DEFTA driver committed.
To: Jason Thorpe <thorpej@nas.nasa.gov>
From: Ted Lemon <mellon@hoffman.vix.com>
List: port-pmax
Date: 05/26/1998 15:38:34 
> Amusingly, my MIPS architecture manual says that the R{2,3}000 cache
> is _write-though_, so I am wondering why flushes are even necessary.
> Can someone enlighten me here?

Flushes shouldn't be necessary, but you need to invalidate cache lines
on DMA memory or access it uncached.

			       _MelloN_