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BF706, Secure boot: UART slave mode

Question asked by Dimitry. on Aug 1, 2017
Latest reply on Aug 16, 2017 by Dimitry.
I debug secure boot modes for the BF706. I attempt to load ldr file in blw format.
I set all neccessary keys to OTP, changed CGU settings, but I haven't yet locked the device.
Blw application loading is successful in the SPI master mode. But the load is failed in the UART slave mode .
I send @, receive 4 bytes, then I send all blwldr file. After 100-200 bytes, Blackfin set the CTS flag and loading is stopped.
I would like to know is it possible to load secure application throw UART without locking device?
P.S.: Flag -NoFillBlock is set in the CCES settings.
Thank you,