Jaw-dropping solution found for Tyan motherboards (including many found in SuperMicro server MoBo's)
The IT8213 kernel driver is actually not needed, libATA can handle communications... if only it knew how!
Turns out, IT8213 relies on i2c??!! Load the i2c driver and voila'... libATA sees the PATA channel. (It's the ONLY thing found on either bus... 0x53)
Regardless, I chose to recompile and afterward, the Tyan and Intel boards that have this chipset are now supported out of the gate.
Thanks guys!