Re: Parallel ATA with libata status with the patches I'm working on

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Fri, Nov 04, 2005 at 01:41:06PM +0000, Alan Cox wrote:
> While writing the new sl82c05 driver I noticed a real nasty lurking in
> the old code. According to the errata docs you have to reset the DMA
> engine every transfer to work around chip errata. It also says that this
> resets any other ATA transfer in progress.
> 
> If both channels are in use there is no locking between the channels to
> stop a reset on one channel as DMA begins making a mess of the other
> channel. Looks like serialize should be set on the driver ?

Possibly, though benh needs to comment.  (I think benh has the only
hardware which has the possibility of both channels - the NetWinder
only has one channel with one disk.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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