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changes.mady.by.user Thorsten Trenz

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TE0722 does boot always from SPI Flash, changing the bootmode Boot Mode is not possible from any of the accessible connector or switches.

If TE0722 SPI Flash is accidentally programmed with Boot.bin that includes a FSBL that is not adapter for TE0722 DDR-less operation then ZYNQ Bootrom Boot-ROM will not release JTAG DAP, and access to JTAG including reprogramming the SPI Flash is no longer possible.

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  1. Close all Xilinx Programs
  2. Power off TE0722
  3. Bridge S25FL127S Pin 7 temporary with GND to change Boot Mode to JTAG Bode Boot Mode only (See picture).
  4. Power on TE0722
  5. Disconnect the GND bridge wire from Pin 7
  6. Open SDK
  7. Program Flash with valid Boot.Bin, if programming failed try again from step 1.

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The easiest way to change the Bootmode Boot Mode pinstrap is temporary connection of SPI Flash Pin 7 to Groundground. This pin connected with Pullup-Resistor to 3.3V, to set FPGA in Quad-SPI Mode. Shorting this Pin with GND will enable JTAG Boot Mode.

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