> > The specification says that 0x0000 means 64K. A couple of controllers do > > get this wrong and we did recently add a second sg list builder for those. > > > > Perhaps a comment or two is in order ? > > - > > Thanks - but which specification is this ? > > As far as I am aware there is no spec for DMA controllers running ATA. SFF 8038i covers the standard taskfile IDE class PCI device interface for PIO and DMA. It also covers the alternate ADMA interface. > Since DMA controller details may vary according to hardware, I > would have expected that ata_fill_sg() would be one of the overloadable > function entries with a driver-specific function that knew about > the DMA controller niceties, and how to stuff a sg entry. It is -n ot directly however but by overloading qc_prep. That makes more sense than overloading fill_sg as not all controllers fit a simple SFF like scatter/gather list model in the first place. Alan - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
