This may need to be put in the "too hard" basket. I have not been able to find anyone who has this working fully (or even partially). The best is AppleAzalia.kext with stereo out only.
This is a shame, because the P5KPL-CM is a very cheap board, with good performance and compatibility (rock-solid stable). There is now an Attansic L1e driver for integrated network, and the sound chip is the only remaining problem. I never use anything more than stereo, but the AppleAzalia driver sometimes does not load, and I would really like microphone input. INPUT is all I need.
I have an SBLive5.1 as well, but the KxOSX driver project is moving very slowly indeed.
Any thoughts as to whether this is possible? or is it a completely different architecture to the ALC 886/888s ??