just try o send ldr to com port directly by blocks - no effect. And at bfin-uclinux-ldr found structures and headers of uart loader... Is it possible to get protocol description?
A description of the UART Slave boot mode is available in the BF60x Blackfin Processor Hardware Reference Manual, in the "Boot ROM and Booting the Processor". This can be found here.
For autobaud, the BF60x expects to be sent the '@' character (0x40), to which it will then send a 4-byte acknowledgement (0xBF, UART_CLK[15:8], UART_CLK[7:0], 0x00).
Once those four bytes have been received, transmission of the boot stream can proceed. Note that if your boot stream includes an Init Code DXE, the host will need to cease transmission. If you have RTS hooked up, the host can pause on the CTS signal while the Init Code executes (it will get 'clear to send' once the init code has executed and the boot kernel has resumed waiting for data), otherwise you should just withhold transmission after transmitting a block with the INIT flag set.
There's a lot more detail in the manual, so I recommend reading the booting chapter.
Retrieving data ...