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TMS320F28377D: How to use SCI BOOT1 and FLASH boot at the same time?

Part Number: TMS320F28377D

1    I want  SCI-boot1 when  Boot mode =1 and  FLASH-boot when Boot mode =3

2 I assume that  Boot mode=3 ->get mode, Key!=0x5A -> flash boot 

  and Boot mode=1 ->sciboot ,BMODE=0x81 ->sci boot1

  Is my assume right?

but after I program Z2-BOOTCTRL to 0x000081FF  with CCS->tools->on chip flash  ->PROGRAM Z2 OTPBOOTCTRL ,  The result is that the DSP will FLASH boot when BOOT mode =3 but SCI boot0 when boot mode =1,  I can deliver the code by GPIO84 and GPIO85 , but cant deliver the CODE by GPIO28 and IO29.

Is the SCIBOOT (when Boot pin =1) only support  SCI boot0?

If I set the key=0x5A, as I tested, I can successfully SCIBOOT1, but  the DSP will always perform sci-boot1, no matter the Boot pin =1 or 3.