From: Gerd Knorr <kraxel@bytesex.org>
To: "David S. Miller" <davem@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: struct page to 36 (or 64) bit bus address?
Date: Sat, 11 Aug 2001 09:09:02 +0200 [thread overview]
Message-ID: <20010811090902.A1978@bytesex.org> (raw)
In-Reply-To: <20010810.145836.41632779.davem@redhat.com>
On Fri, Aug 10, 2001 at 02:58:36PM -0700, David S. Miller wrote:
>
> I'm using the patch below (pulled out of Jens Axboe's bio
> patches, i386 only).
>
> Are you sure you aren't missing anything in this patch? For example,
> one can't use the patch you've provided for 64-bit DMA unless the
> dma_addr_t type is made larger.
It only allows to use the full 32 bit address range for DMA. Without
the patch I'm limited to direct mapped memory (i.e. < ~900MB on i386).
With the patch highmem below 4GB can be used too.
Jens's bio patches don't have support for 64-bit DMA (at least not the
version I've used to build that patch). Because the bt848/878 chips
are 32-bit devices only I havn't even tried to fix that...
Gerd
--
Damn lot people confuse usability and eye-candy.
next prev parent reply other threads:[~2001-08-11 8:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-09 18:40 struct page to 36 (or 64) bit bus address? Johannes Erdfelt
2001-08-09 19:09 ` Alan Cox
2001-08-09 19:10 ` Johannes Erdfelt
2001-08-09 19:19 ` Alan Cox
2001-08-09 20:25 ` David S. Miller
2001-08-09 20:35 ` Johannes Erdfelt
2001-08-10 7:00 ` Gerd Knorr
2001-08-10 7:56 ` Johannes Erdfelt
2001-08-10 21:58 ` David S. Miller
2001-08-11 7:09 ` Gerd Knorr [this message]
2001-08-12 10:49 ` Write Combining (Write Coalescing) on memory mapped I/O on IA64 Steffen Persvold
2001-08-11 15:32 ` struct page to 36 (or 64) bit bus address? Jens Axboe
2001-08-11 15:56 ` Andrea Arcangeli
2001-08-11 16:13 ` Sandy Harris
2001-08-12 8:00 ` David S. Miller
[not found] <no.id>
2001-08-12 11:49 ` Alan Cox
2001-08-13 13:51 ` David S. Miller
2001-08-13 14:09 ` Alan Cox
2001-08-13 14:21 ` David S. Miller
2001-08-13 19:07 ` Gérard Roudier
2001-08-13 19:42 ` David S. Miller
2001-08-13 15:10 ` Alan Cox
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