From: Haavard Skinnemoen <hskinnemoen@atmel.com>
To: Marc Pignat <marc.pignat@hevs.ch>
Cc: Andrew Victor <linux@maxim.org.za>,
kernel@avr32linux.org, linux-kernel@vger.kernel.org,
Remy Bohmer <linux@bohmer.net>,
Chip Coldwell <coldwell@redhat.com>
Subject: Re: [PATCH 6/6] atmel_serial: Add DMA support
Date: Wed, 23 Jan 2008 15:05:11 +0100 [thread overview]
Message-ID: <20080123150511.3785986c@dhcp-252-066.norway.atmel.com> (raw)
In-Reply-To: <200801231452.55388.marc.pignat@hevs.ch>
On Wed, 23 Jan 2008 14:52:55 +0100
Marc Pignat <marc.pignat@hevs.ch> wrote:
> On Wednesday 23 January 2008, Haavard Skinnemoen wrote:
> > On Wed, 23 Jan 2008 14:18:38 +0100
> ...
> > GFP_DMA doesn't have anything to do with alignment, AFAIK.
> I don't even know if it does something for at91 or avr32, but there is a flag
> for dma memory, so we should use it.
No, I think GFP_DMA is for legacy ISA DMA and other DMA controllers
with addressing limitations. The PDC is capable of accessing the full
32-bit physical address space on both AT91 and AVR32, so no special DMA
flags are needed.
Haavard
next prev parent reply other threads:[~2008-01-23 14:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-22 14:50 [PATCH v3 0/6] atmel_serial: Cleanups, irq handler splitup & DMA Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 1/6] atmel_serial: Clean up the code Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 2/6] atmel_serial: Use cpu_relax() when busy-waiting Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 3/6] atmel_serial: Use existing console options only if BRG is running Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 4/6] atmel_serial: Fix bugs in probe() error path and remove() Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 5/6] atmel_serial: Split the interrupt handler Haavard Skinnemoen
2008-01-22 14:50 ` [PATCH 6/6] atmel_serial: Add DMA support Haavard Skinnemoen
2008-01-22 16:52 ` Marc Pignat
2008-01-23 11:53 ` Haavard Skinnemoen
2008-01-23 12:30 ` Marc Pignat
2008-01-23 12:45 ` Haavard Skinnemoen
2008-01-23 13:18 ` Marc Pignat
2008-01-23 13:35 ` Haavard Skinnemoen
2008-01-23 13:52 ` Marc Pignat
2008-01-23 14:05 ` Haavard Skinnemoen [this message]
2008-01-23 15:04 ` Alan Cox
2008-01-23 15:14 ` Haavard Skinnemoen
2008-01-23 16:41 ` Alan Cox
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