Promise has given me permission to post hardware programming info for
one of their chips (Linux driver: sata_promise), PDC20319. This also
marks the first open chipset for Promise (AFAIK), so let's give them a
round of applause.
The PDC20319 is a reasonably representative example of the hardware
programming interface covered by sata_promise. Kernel developers
wishing to work on sata_promise can study this doc, and deduce how the
two-port PDC2037x chips work.
In addition to describing the "packet" format for ATA and ATAPI
commands, this doc also describes how to use the chip's XOR RAID-assist
features. I think it would be cool if someone so motivated found a way
to use this efficiently under Linux.
The doc:
http://gkernel.sourceforge.net/specs/promise/pdc20319.pdf.bz2
I have also updated the list open chipsets and developer resources on
linux-ata.org:
http://linux-ata.org/driver-status.html#open_chipsets
http://linux-ata.org/devel.html
Have fun!
Jeff
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