Messages in this thread |  | | | Subject | Re: Parallel ATA with libata status with the patches I'm working on | | From | Benjamin Herrenschmidt <> | | Date | Sat, 05 Nov 2005 10:19:03 +1100 |
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On Fri, 2005-11-04 at 23:10 +0000, Russell King wrote: > 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.)
I don't have this hw anymore, it was a design I worked on for my previous employer, years ago, I don't have access to it anymore and the company doesn't exist anymore.
Ben.
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