Messages in this thread | | | Date | Sun, 29 May 2005 12:59:14 -0400 | From | Jeff Garzik <> | Subject | Re: Playing with SATA NCQ |
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Erik Slagter wrote: > On Sun, 2005-05-29 at 12:34 -0400, Jeff Garzik wrote: > >>>>Now, this patch is not complete. It should work and work well, but error >>>>handling isn't really tested or finished yet (by any stretch of the >>>>imagination). So don't use this on a production machine, it _should_ be >>>>safe to use on your test boxes and for-fun workstations though (I run it >>>>here...). I have tested on ich6 and ich7 generation ahci, and with >>>>Maxtor and Seagate drives. >>> >>>Is this supposed to work on ICH7 in legacy mode as well? >> >>Nope. ata_piix does not support NCQ (because the h/w doesn't support). > > > If I understand this correctly: NCQ does not work on ICH7 in native mode > (using ata_piix) because in this mode there is no NCQ available, right?
To be more specific, there are these modes:
legacy mode no NCQ combined mode no NCQ native mode no NCQ AHCI mode NCQ
>>>Another question: is there a fundamental problem to have the ICH6/7 >>>enabled AHCI mode by the kernel instead of the BIOS? I know some BIOSes >>>don't offer the choice to enable AHCI (like mine :-(). >> >>Not a problem. You just don't get to use AHCI and such. > > > Huh? > > My question was if there is a fundamental reason why the AHCI mode of > the ICH6/7 must be enabled by the BIOS, is there a reason why the kernel > doesn't do it, or can't do it?
The BIOS sets up PCI resources necessary to use AHCI mode.
Jeff
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