Tejun Heo wrote:
PMP support requires support from low-level drivers (sata_sil24,
sata_promise,...) and sata_promise doesn't have it yet. As noted above,
the only supported card is SiI3124/32 and I'm working on AHCI. As for
sata_promise, I don't know. I don't have the card nor the document, so
it won't come out of me. Jeff is planning to work on sata_promise and
he might also do PM stuff, I guess.
FWIW, for sata_promise (PDC205xx):
I just looked in the docs, for Port Multiplier stuff. There is a single
vendor-proprietary 4-bit "PM port" MMIO register for each channel (aka
each SATA port).
You may program this register only when the port is idle, no active
commands nor DMA.
Jeff
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