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FPGA loads from address 0, Microblaze starts from BRAM with SREC Loader
SREC Loader (customized part of it) checks some I/O pin to choose between update mode or normal mode
In case of Update mode, SREC loader loads u-boot into external RAM and executes ubootu-boot
In case of normal Normal Application mode, warm boot is done executed by writes to HWICAP to start Application Bitstream

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