I read FlashMagic expert's advice that there are many causes of autobaud failure. One cause is lousy power supply. So I checked my PSU and found that it is indeed lousy. I used PC's USB connector cable to supply the Somy board and make a summary.
At power routing board from Somy board power pin connector
Input 4.67V
At Somy board = 3.87V, 2.382V.
Then I used an external power supply which drops to 4.89V at the routing board, and the voltage at Somy board's power connector is 4.15V, 3.09V.
I am not sure if 3.09V is OK for the Somy board's RS232 circuit.
.END
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