Forum Post: question about c6678's FPGA

hi, all:

in the ti's "TMDSEVM6678Lx_EVM_REV_3_0_Known_Issues": 2.6 The FPGA code update issue on the EVMs,

it says: "The FPGA cannot be reprogrammed while the UCD9222 contains a configuration and it is operating.  One solution requires erasing the configuration from the UCD9222 before programming the FPGA.  The alternate and preferred solution is reprogramming the FPGA from the DSP with CCS connected."

So I have 2 questions about this:

1. why cant't the FPGA be programmed while the UCD9222 has configuration? When the FPGA is programmed, will the 6678's core voltage be changed? or some other reason?

2. The CCS the FPGA can be reprogrammed, can anyone tell me in what way or path the FPGA get programmed, how does it work?

Thanks!