Just remembered other threads about SPI on the LCDK. You might be better off using SPI1 through J16 instead of SPI0. This depend on the version of your LCDK board. If it is a newer one, the AES850 (U26) chip will not be installed and cannot interfere with SPI1 pins. Your code will have to use SPI1_SCSn_3. I haven't checked if R208 is installed on the later version boards. That resistor is required to connect SPI1_SCSn_3 to J16.
http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/234899.aspx
http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/282306.aspx
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Forum Post: RE: c6748 LCDK- SPI0_CLK enable problem
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