From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] lasi scsi driver
Date: Sun, 5 Mar 2000 22:05:54 +0100 [thread overview]
Message-ID: <20000305220554.A2194@alpha.franken.de> (raw)
In-Reply-To: <20000305194652.A9157@abacus.local>; from Philipp Rumpf on Sun, Mar 05, 2000 at 07:46:52PM +0100
On Sun, Mar 05, 2000 at 07:46:52PM +0100, Philipp Rumpf wrote:
> uncacheable main memory is the only sane way to deal with cache-incoherent
> DMA - macros to flush the cache are both slower and harder to add to drivers
> written with the assumption that dma is cache-coherent.
I can't say how things are for PARISC, but in the MIPS world it's usually
better to use cached memory/flush caches than doing uncached accesses.
And adding cache flushes to a driver isn't that big task, if you know
the hardware (been there, done that).
Thomas.
--
This device has completely bogus header. Compaq scores again :-|
It's a host bridge, but it should be called ghost bridge instead ;^)
[Martin `MJ' Mares on linux-kernel]
next prev parent reply other threads:[~2000-03-05 22:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-03-02 20:42 [parisc-linux] lasi scsi driver Gyula Matics
2000-03-02 21:19 ` Grant Grundler
2000-03-02 21:44 ` Gyula Matics
2000-03-03 0:50 ` [parisc-linux] Lasi Ethernet - update Helge Deller
2000-03-03 2:55 ` Bdale Garbee
2000-03-03 13:14 ` [parisc-linux] Lasi Ethernet - update (fixed!) Helge Deller
2000-03-03 1:34 ` [parisc-linux] lasi scsi driver Helge Deller
2000-03-03 15:52 ` willy
2000-03-03 19:10 ` Jerry Huck
2000-03-04 19:49 ` willy
2000-03-05 5:49 ` Grant Grundler
2000-03-05 14:29 ` [parisc-linux] uncacheable memory willy
2000-03-05 15:57 ` [parisc-linux] uncacheable memory (D370) rob hoppe
2000-03-05 16:05 ` willy
2000-03-06 6:26 ` uncacheable memory Grant Grundler
2000-03-05 18:34 ` [parisc-linux] lasi scsi driver Philipp Rumpf
2000-03-05 18:46 ` Philipp Rumpf
2000-03-05 21:05 ` Thomas Bogendoerfer [this message]
2000-03-07 19:33 ` Jerry Huck
2000-03-07 23:45 ` Philipp Rumpf
2000-03-08 0:33 ` Grant Grundler
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