Hi Finn,
On Fri, Aug 15, 2014 at 1:46 PM, Finn Thain <[email protected]> wrote: > > On Thu, 14 Aug 2014, Michael Schmitz wrote: > >> > >> > > > When cmd->device->borken, I assume sun3_NCR5380 inhibits PIO >> > > > because PIO was itself expected to be problematic? >> > > > >> >> The sun3 driver does set the borken flag but never uses it later - can't >> see where it will inhibit PIO. > > It inhibited PIO when it forked the atari code and commented out the test > for cmd->device->borken, to ensure that PIO would never be used here. I see. I just tool that to mean the Sun3 driver never had trouble with devices failing at that section, so no need to switch from DMA to PIO (because DMA never fails). > Hence my suggestion that PIO itself was expected was problematic. OTOH, > PIO is used up to 128 bytes, and beyond 128 bytes if !REQ_TYPE_FS... Up to 128 for DMA limitations - the other bit I don't understand either. Cheers, Michael > -- -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
