Glad you figured out the refclk issue. The TCI parts are not supported on the e2e forums, only with local FAE support.
Yes the C64x examples will be quite different from the Keystone examples. Hopefully you have downloaded the MCSDK and you are referring to the example at:
C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\srio\example\SRIOLoopbackDioIsr
If so, there is a very small change to take it out of loopback and do chip-to-chip. Please see:
http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/p/170264/752157.aspx#752157
The very first post explains it.
Regards,
Travis