Messages in this thread | | | From | Jonathan Woithe <> | Subject | Re: IDE/ATA: Intel i865-based mainboard, CDROM not detected | Date | Fri, 1 Jun 2007 16:35:56 +0930 (CST) |
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Jeff Garzik wrote: > Lennart Sorensen wrote: > > On Thu, May 31, 2007 at 10:21:57AM +0930, Jonathan Woithe wrote: > >> I don't think so but I could be wrong. When "Configure SATA as" was set to > >> "IDE" the HDD was being detected as a SATA drive and showed up as /dev/sda. > >> The only visible difference the change to "AHCI" made was that instead of > >> the drive being handled by the ata_piix it now utilises the ahci driver > >> (which is a much better driver). The other interesting thing is that the > >> probe for the Marvell PATA device occured before the initialisation of the > >> ata_piix driver (or ahci for that matter), so as far as I can tell ata_piix > >> had no chance to grab any ports before the marvell driver initialised. > > > > Linux can still detect the chip and drive it natively even if the bios > > is emulating IDE/PATA on the chip. And libata will make both PATA and > > SATA show up as /dev/sda now if you use libata for both. On the other > > hand if the bios has configured the intel chip to use the standard ide > > registers, then it can't have configured the marvell to do so I would > > guess, which could make it difficult to talk to. > > Mostly true... "standard IDE" can be configured in two modes, legacy > mode and native mode. Legacy mode has fixed addresses originating from > the ISA days (0x170, 0x1f0, irqs 14 & 15), and (as you implied) you > cannot bind two IDE controllers to the same ISA addresses. > > OTOH, an unlimited number of IDE controllers can be configured into > native mode, where all addresses and irq are allocated using standard > means accorded all PCI devices.
In the situation being discussed, "ATA/IDE Mode" was set to "Native" in the BIOS (the other option for this item was "Legacy"). The BIOS had a separate "Configure SATA as" item with the options RAID, IDE and AHCI and it is this one which, when set to IDE, prevented Linux from finding the Marvell PATA chip - even though "ATA/IDE Mode" was set to "native".
The legacy/native issue Jeff discusses sounds like it relates to the "ATA/IDE Mode" BIOS setting. Since this was always "Native" during the tests and given what Jeff wrote, I would have thought the BIOS would not be using the legacy ISA-era settings and therefore they were not the reason for Linux not finding the Marvell PATA controller.
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