From: Dan Malek <dan@embeddededge.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: Armin <akuster@pacbell.net>, Tom Rini <trini@kernel.crashing.org>,
Armin Kuster <akuster@mvista.com>,
linuxppc-embedded@lists.linuxppc.org,
Paul Mackerras <paulus@samba.org>
Subject: Re: Another OCP enet patch
Date: Wed, 29 May 2002 10:51:21 -0400 [thread overview]
Message-ID: <3CF4EAE9.1080505@embeddededge.com> (raw)
In-Reply-To: 20020529034854.GC16537@zax
David Gibson wrote:
> Well, actually, dma_cache_wback() and friends still appear to be more
> widely used than consistent_sync(). AFAICT only PPC and ARM use
> consistent_sync().
Just for a historical note.....these functions were implemented about
the same time to support non-PCI USB controllers. They have found other
uses since then. Other architectures seem to assume PCI is always present,
and will call the dma_cache_* functions within the pci functions to get
the same effect. For non-PCI devices, they still call the pci functions
with a null pointer for the pci_dev. On PPC and ARM we had systems that
wouldn't compile properly with PCI enabled, since there wasn't any PCI
bridge support (even fake ones :-). We just added the consistent_sync()
to be orthogonal with the other archtecture independent consistent_* functions.
The other architectures are moving this way as they are finding it more
difficult to continue to fake a PCI on systems that really don't have it.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-05-29 14:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-27 4:03 Another OCP enet patch David Gibson
2002-05-27 6:14 ` Armin Kuster
2002-05-27 16:23 ` Tom Rini
2002-05-28 0:57 ` David Gibson
2002-05-28 1:25 ` Tom Rini
2002-05-28 6:36 ` David Gibson
2002-05-28 15:08 ` Tom Rini
2002-05-28 7:02 ` Armin
2002-05-28 6:50 ` David Gibson
2002-05-28 10:51 ` Dan Malek
2002-05-29 3:48 ` David Gibson
2002-05-29 14:51 ` Dan Malek [this message]
2002-05-28 10:39 ` Dan Malek
2002-05-29 4:16 ` David Gibson
2002-05-29 15:02 ` Dan Malek
2002-05-29 16:01 ` Armin Kuster
2002-05-30 3:10 ` David Gibson
2002-05-30 3:09 ` David Gibson
2002-05-30 4:16 ` Dan Malek
2002-05-30 4:30 ` David Gibson
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