feat(fpga_diff): support JTAG flash writes#134
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Add a flash-only JTAG AXI path to the BRAM-backed boot flash and keep the COE-initialized 32 KiB blk_mem_gen target writable from Vivado. Use make write_jtag_flash WORKLOAD=<bin> to write a raw image and sample-check readback.
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Add a flash-only JTAG AXI path to the BRAM-backed boot flash and keep the COE-initialized 32 KiB blk_mem_gen target writable from Vivado.
Use make write_jtag_flash WORKLOAD= to write a raw image and sample-check readback.