+linux-parisc mailing list (public list since link at bottom is public too) On Wed, May 22, 2019 at 9:16 AM Carlo Pisani <carlojpisani@xxxxxxxxx> wrote: > hi > I have been testing a few PCI-X SATA cards on C3600 and they do not > work properly for weird not yet clear reason. > > Here (1) you can see what I tested, how, etc. Hi Carlo, It's awesome that you are testing SATA cards and running linux on a C3600. "not work properly" isn't a lot of information to go by. You've been keeping good notes at (1) and I encourage others on the parisc mailing list to take a look. > Cards have been recently tested on a PowerMacG4 and they do work > perfectly. Note the PowerMacG4 is PCI64, not PCI-X, so it's the same > as the C3600. While PCI bus type is the same, most problems with device drivers are at DMA Coherency/Memory ordering level. C3600 has PA8600 processor and you might learn more about PA-8600 processor, Astro (IOMMU), and Elroy (PCI host controller) from https://www.openpa.net/systems/hp-visualize_b1000_c3000_c3600.html If you can try some experiments, start adding mb() calls after the driver adds or removes an IO request from any list or queue. > My feelings about a PCI-X card in the PCI64 of the C3600 is that there > is something wrong, probably the PCIXCAP pin is missing on the BUS? I have no idea. It's been > 10 years since I've had access to HP HW documents or used a PCI or PCI-X bus analyzer. I'm skeptical on your hypothesis though - HP was very thorough in complying with PCI spec - assuming PCIXCAP pin was defined by PCI spec. You'd have to get a PCI protocol analyzer to collect signaling information to see where the card fails to initialize or operate correctly. > What do you think? > Carlo > > (1) http://www.downthebunker.com/reloaded/space/viewtopic.php?f=50&t=337 cheers, grant
