On 2019-05-14 4:15 a.m., Carlo Pisani wrote: > I am surprised that a PCI-X chip isn't able to switch into PCI64 mode. > Cards are usually declared "backward compatible", and it would be just > a matter of "how" to handle the finite state machine that drives the > PCI, plus the onboard PLL and synchronization. I agree but it appears fallback requires BIOS or a QUIRK to configure card. One would have to look at driver and/or BIOS to see what is/can done. Maybe OpenBIOS has something. There is ENABLE_HARDFAIL config option in lba_pci.c which determines whether HPMC occurs. Soft fail might be useful to debug. However, I doubt there's enough public information to configure card given what Alan said. > > >> Here are some Adaptec 64-bit cards that I found. >> https://storage.microsemi.com/en-us/support/raid/sata/aar-2410sa/ >> https://storage.microsemi.com/en-us/support/raid/sata/aar-21610sa/ > as written here (1), we have already tested Adaptec 2410SA, and I have > also recently received an email by AlanCox confirming that the card is > x86-only! > > Subsystem: Adaptec AAR-2410SA PCI SATA 4ch (Jaguar II) > > It fails on every non-x86 machine because it relies on PC-BIOS > extension for the initialization of the onboard Intel i960 chip, and > we do not have any Linux kernel driver able to do what the PC-BIOS > does. I had listed these cards because they are PCI64 and the Adaptec site didn't say Intel architecture was required. There was one card that claimed to be PCI-X and PCI64 (both 3.3 and 5V signalling) but it required Intel or AMD architecture. Dave -- John David Anglin dave.anglin@xxxxxxxx
