Driver needed for Promise PDC42819 SATA/SAS controller

Greg KH greg at
Thu Aug 14 22:16:45 UTC 2008

On Wed, Aug 06, 2008 at 01:04:23PM +1000, Mark Nelson wrote:
> Hi Greg,
> I think I have an addition for the following list:
> I recently bought an MSI K9A2 Platinum motherboard and it has a
> Promise SATA/SAS RAID (fakeraid) controller onboard that is not
> currently supported by the Linux kernel (as far as I can tell anyway).

hardware raid is bad, stay away from it :)

Seriously, if at all possible, it's just not worth it, use software
raid, it's faster and more reliable (you can restore your disks if the
controller breaks...)

> References to the controller in the motherboard manual and the
> motherboard manufacturer's website: Promise T3 [1]
> Written on the actual chip on the motherboard: Promise PDC42819 [2]
> This chip is also used on Promise's own FastTrak TX2650 & TX4650
> adapters [3] which have "partial open source" drivers [4], [5]. This
> driver looks like an open source wrapper around a binary blob (some
> fasttrak library for software fake raid, I think).
> Having a quick look through the source of Promise's driver, it looks
> like the driver has been hacked up out of a driver that was originally
> used for fakeraid on ATI and intel southbridges as well as Promise's
> SX4 adapter (and some Promise adapter called the OCTOPUSII).
> Promise has an open source commitment written on its werbsite [6] but
> it just relates to their SuperTrak products (not their FastTrak ones)
> and the stex driver.

Try bringing this up on the linux-ata mailing list, the developers there
should be able to easily help you out.


greg k-h

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