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I bought a Spartan-6 dev board as it has the same FPGA (LX16) I'm using for another project.
I've tested the LEDs, Buttons, UART and SPI FLash. There are schematics for the board at
http://piswords.com/xc6slx16.html
I started using openocd to program the part, then switched to openFPGALoader - which has a recent commit to support the Spartan-6 X16 in ftg256 package. toolchain_program() works with both programming techniques.