[U-Boot] Compiling U-Boot for OMAP 3530 Thunder with network support

How do I compile U-Boot for the OMAP 3530 Thunder board with network support? The latest official U-Boot tarball seems to lack the omap3_thunder_config option, which is included in the TechNexion release. But even using the latter release, how do I configure network (NFS, TFTP) support for the SMSC 9500 USB/Ethernet controller?

Thank you for any help.

Alex