Question:

Silicon Errata items:
      #16: loader does not support TDM, BSP, 8bit Parallel
      #17: loader does not support BSP, 8bit Parallel
      #18: loader does not support 8bit Parallel AND changed CLKX
               to be an INPUT.

Doesn't this make the earlier serial boot method inoperable?

Answer: No. The bootload function only uses the receiver (CLKR).