Hi,
You can get all the technical docs & s/w (Which includes schematics, TRM, data sheet etc.,) for OMAPL138 LCDK from the following link.
http://www.ti.com/tool/tmdxlcdk138#Technical%20Documents
Schematics - > focus.ti.com/download/freetools/omap-l138_c6748_lc_dev_kit_ver_a6a%20.zip