Not supported yes, but it is, or can be, detected and used as an AHCI sata controller. I have a 4 drive setup with ESXi 4.1 using 3 of those drives as RDMs, or RAW device mappings. Basically all it is is a vmdk file pointing to the actual device itself instead of a LUN. Here's the
link i used to do this from the ESXi console.