Does the Latitude E6230 eSATA port support port multiplier?

Hi guys, I’m trying to determine if the eSATA port of my Latitude E6230 supports port multiplier aka SATA PM (to allow multiple SATA devices to be connected to the same port) and if so, what BIOS revision is required.

My problem is that when connecting my eSATA dual hard drive docking station, only one of the drives are usable by the OS.

My guess is it’s not supported but have been trying to find the Latitude E6230 specifications confirming this without luck.

Anyone knows?