Hi,
Once upon a time FD Cami wrote:
On Sun, 6 Jan 2008 13:36:09 +0000
Alan Cox <[EMAIL PROTECTED]> wrote:
> On Sun, 6 Jan 2008 08:03:31 +0300
> > > For now you can boot with libata.dma=1 to select DMA on disks but
> > > not CD
> >
> > Great, but why isn't this in the documentation?
>
> Send patches
patch attached.
Description : Add libata.dma= to Documentation/kernel-parameters.txt
Found documentation in :
http://www.mail-archive.com/linux-ide%40vger.kernel.org/msg09849.html
http://www.redhat.com/archives/fedora-extras-commits/2007-October/msg04568.html
Signed-off-by: François Cami <[EMAIL PROTECTED]>
*["libata-doc-patch.txt" (text/plain)]*
<http://marc.info/?l=linux-kernel&m=119963307018562&q=p3>
diff -rU2 linux-2.6.24-rc6/Documentation/kernel-parameters.txt \
linux-2.6.24-rc6-mine/Documentation/kernel-parameters.txt
--- linux-2.6.24-rc6/Documentation/kernel-parameters.txt 2008-01-06 \
15:58:54.000000000 +0100
+++ linux-2.6.24-rc6-mine/Documentation/kernel-parameters.txt 2008-01-06 \
16:11:20.000000000 +0100 @@ -883,4 +883,11 @@
C2 power state.
+ libata.dma= [LIBATA] DMA control
+ libata.dma=0 Disable all PATA DMA like old IDE
+ libata.dma=1 Disk DMA only
+ libata.dma=2 ATAPI DMA only
+ libata.dma=3 CF DMA only
+ libata.dma=0,1,3 Combinations also work.
+
The code patch you are looking at has little different semantics.
(1 << 2) is 4 not 3... Values for different devices are:
1 - ATA
2 - ATAPI
4 - CF
The parameter is a bitmask of 1, 2, 4. Default is 7.
2.6.24-rc3 also has this in libata-core.c which confirms
the acceptance of a bitmask :
static int libata_dma_mask =
ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
Best regards,
Zoltán Böszörményi
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