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just at the begin of main() in FSBL would help to see if at least the console UART is working.

Enabling Debug info logging in FSBL.

zynq_flash

Is a command-line tool from Xilinx to write nonvolatile memory connected to Zynq PS. With current versions of tools there is minor problem with file extensions: on windows platforms only lowercase .bin is accepted as extension. Boot bin generated with petalinux would be however generated as BOOT.BIN with uppercase extension. It is not possible to use it with Xilinx SDK Flash Programmer GUI or the commandline zynq_flash. GUI Flasher will not allow to select a file with upper case extension, and zynq_flash will also refuse to flash from it if the file is given with uppercase extension. As a workaround the image to be burned has to be renamed with lower case extension (.bin). The name of the image can be anything, just the extension has to be bin in lowercase. There is no need to convert bin to mcs for the zynq_flash, it makes little sense.

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