Did the Pins of SDRC and GPMC have been used on Beagleboard xM?

I am using a Beagleboard xM, I just have read the SCH and found that the pins of SDRCs and GPMCs are leaving without connecting. GPMCs have no connecting because there is no nandflash, and SDRCs have no connecting because the RAM useing PoP packaging, so I want to know that if I can use the SDRCs or GMPCs to connecting to orther devices, such as FPGA?

You can use GPMC. You cannot use DDR.