>>>>> In <46C44A05.9040302@xxxxxxxxxxx> >>>>> Jonathan Bastien-Filiatrault <joe@xxxxxxxxxxx> wrote: >> Tejun Heo wrote: >> >> > Hello, >> > >> > Jonathan Bastien-Filiatrault wrote: >> > >> >> Hello, >> >> >> >> I am the owner of a Dell Latitude D620 notebook with an ICH7 SATA >> >> controller, unfortunately, the BIOS does not offer the option of using >> >> "native mode" instead of "compatibility mode" when it comes to SATA. For >> >> now, the ata_piix runs happily in compatibility mode. Looking at the >> >> ICH7 docs, I found that poking register 0x90 in PCI configuration space >> >> with value 0x40 should enable AHCI. However, there are some issues with >> >> poking that register with setpci in an early initramfs: >> >> >> >> >> >> - The kernel does not seem to update the device id from PCI config >> >> space, which changes with the controller mode (it would seem the PCI >> >> subsystem keeps a copy) >> >> >> >> - Poking PCI registers from userspace is far from ideal >> >> >> >> >> >> It would be great if the AHCI driver (or otherwise) had a >> >> "force_ich7_ahci" to properly setup and initialize this device in full >> >> "native" AHCI mode. This option would be greatly welcome from users like >> >> me who have a stupid bios (eh, who doesn't). >> >> >> > >> > Sorry but most BIOSen don't map ABAR unless it supports AHCI and there >> > usually isn't a hole to fit in ABAR afterwards unless the kernel >> > completely reallocates IO resources, which, again unfortunately, can't >> > be done reliably cuz machines can be quirky and might puke if addresses >> > aren't laid out as their BIOSen would do. >> > >> > So, you'll have to live with ata_piix. >> > >> > >> So far, I have managed to patch up the AHCI driver to initialize the >> ICH7 AHCI state machine as the BIOS would do (as per the AHCI spec >> instructions). This involves mapping ABAR and such. So far, I have >> gotten the AHCI driver to detect the chip properly, but it does not >> detect any drives. It looks like I will need to further initialize the >> chip. I think there might be a chance of success, but it will involve >> manually specifying which ports are present via a module parameter. Do you know Edvin's patch? http://www.bughost.org/pipermail/power/2007-June/000538.html I've tested it and works fine on my note (Sony VAIO type S VGN-SZ92PS, ICH7-M) -- ISHIKAWA Mutsumi <ishikawa@xxxxxxxxxxxx>, <ishikawa@xxxxxxxxxx> - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
