Mark Nelson writes: > On Tue, Sep 2, 2008 at 9:19 PM, Jeff Garzik <jeff@xxxxxxxxxx> wrote: > > Mark Nelson wrote: > >> > >> Add an appropriate entry for the Promise PDC42819 controller. It has an > >> AHCI mode and seems to work correctly with board_ahci. > >> > >> This chip is found on Promise's FastTrak TX2650 (2 port) and TX4650 (4 > >> port) > >> software-based RAID cards (for which there is a binary driver, t3sas) and > >> can be found on some motherboards, for example the MSI K9A2 Platinum, > >> which calls the chip a Promise T3 controller. > >> > >> Signed-off-by: Mark Nelson <mdnelson8@xxxxxxxxx> > >> --- > >> Apparently this chip also supports SAS disks, will these work with the > >> ahci driver (I've only tested with normal desktop SATA disks)? > > > > ahci is definitely SATA-only, so I wonder how they modified AHCI to support > > SAS transport... > > That is a good question. From my understanding the controller is a SAS > controller that can drive SATA disks (as I guess all SAS controllers can > do...). Could it be that the controller can be setup to act as an AHCI > SATA controller or if the right registers are poked a SAS controller? Based on how the sata_promise-supported chips work I'd guess that they have dual programming interfaces with AHCI for JBOD SATA and a native one (perhaps just additional control registers) for SAS and raid. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
