On Thu, Jan 09, 2025 at 11:33:11AM +0000, Philip Pemberton wrote: > On 09/01/2025 07:17, Hannes Reinecke wrote: > > Which makes me wonder: does the SATA-to-PATA support ATAPI? It has been > > removed from recent ATA specifications, so there's a chance the bridge > > simply doesn't implement it ... > > It seems to -- if I use the SATA-to-PATA adapter to put the drive in the > Knoppix PC, the Zip drive works fine. Which SATA-to-PATA adapter are you using? Perhaps that computer (which was running a v3.x kernel) is using a different SATA controller/driver, which has better ATAPI support? Do you have the: [ 4465.218535] ata3.00: ATAPI: IOMEGA ZIP 100 ATAPI, 12.A, max PIO3, CDB intr, DMADIR [ 4465.225787] ata3.00: configured for PIO0 prints from that other PC running v3.x kernel? E.g. DMADIR can be automatically detected, if it is needed based on the returned data in the IDENTIFY PACKET response, see: https://www.mail-archive.com/linux-ide@xxxxxxxxxxxxxxx/msg16469.html https://www.spinics.net/lists/linux-ide/msg01514.html The DMADIR print will only be there if we send an explicit DMA direction with each command. It would be interesting to see if it was there on your older kernel. Also your device seems to only indicate support for PIO3, thus we see it being configured for PIO. Thus, it seems that you are using PIO instead of DMA. I think that DMADIR only matters when using a DMA mode and not PIO. Forcing DMADIR=1 when your device only supports PIO, feels wrong to me, but perhaps I am missing something. Also, why is your device only being configured for PIO0 when it seems to support up to PIO3 speeds? Bug? E.g. my print when using QEMU + ATAPI: [ 0.647370] ata2: SATA max UDMA/133 abar m4096@0xfebd2000 port 0xfebd2180 irq 90 lpm-pol 0 [ 0.966896] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 0.971060] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100 [ 0.971818] ata2.00: applying bridge limits [ 0.972918] ata2.00: configured for UDMA/100 shows that the device supports up to UDMA/100, and later we also see that we configure it for that speed. Kind regards, Niklas
