Hi Michael, Op zo 10 nov. 2019 om 20:26 schreef Michael Schmitz <schmitzmic@xxxxxxxxx>: > >>> case for any of the cards the zorro_esp drives, it might be better to > >>> lower the max length to 61440 (64k-4k) so the residual is a page. > >> For the benefit of keeping the code simple, and avoid retesting the > >> fastlane board, that might indeed be the better solution. > > > > But it's slower... :-P > > > I wonder what max. transfer size had been used so far, in the majority > of cases. I hadn't observed this bug in my tests of the ESP driver on > elgar. So it might not matter so much in practice. Does Elgar indeed have a Blizzard 2060 as https://wiki.debian.org/M68k/Autobuilder says? If it does, it does surprise me that it works, since the DMA engine appears to be very much like the one of the Blizzard 1230 (including the >> 1 of the address). Even when just loading bash on my system, there were many 65535-and-then-1 byte transfers. It may of course depend on how fragmented your disk is. > > Also, I may be adding another board-specific version for the Blizzard > > 12x0 IV to enable 24-bit transfers, like the am53c974 driver does, in > > a later patch. > > If we can differentiate between the Mark IV board and the Mark II board > in a reliable way, fine. I can't remember whether I've had a report on > that ever. They have a different Zorro ID, so that should not be a problem. By the way, do you remember why you chose to not use the full Zorro IDs for the various SCSI boards asdefined in zorro_ids.h but only the manufacturer defines? Kind regards, Kars.
