Re: [RFC][PATCH] ahci: Add support for Promise PDC42819

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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.
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