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Note

The usage of this steps is at owner's own risk. Trenz Electronic is not liable for damage caused by following this steps.

Short Description

The TE0722 is configured to boot from flash with JTAG in cascade mode. If you configure the TE0722 Flash with wrong Boot.bin (for ex. you use Xilinx default or wrong FSBL. Or you insert additional applications file into the boot.bin without necessary workarounds), the Zynq - PS is running into a state, in which the FPGA and the Flash is not accessible via JTAG.This workaround set the FPGA in JTAG independent mode on startup to erase the corrupt flash content.

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

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

 

Note
Note

The Xilinx tools do not handle DDR-Less Design FSBL autogeneration correctly, to . To get around this "bug" problem manual modifications are necessary, see DDR less ZYNQ Design. It should be fixed or make a little bit confortable by Xilinx but until Vivado 2016.2 it's not done.

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Procedure

For this case, you can try the following steps without guarantee for success:

  1. Close all Xilinx Programs.
  2. Power off TE0722
  3. Bridge S25FL127S Pin 7 temporary with GND to set change Boot Mode  Mode to JTAG Bode Mode only (See picture).
  4. Power on TE0722
  5. Open SDK
  6. Disconnect you GND bridge to Pin 7
  7. (optional) Try to get access to the FPGA with SDK Debugger (Is this not possible, flash programming is also not possible)
  8. Open SDK
  9. Pprogram Try to program Flash with valid Boot.Bin, if programming failed try again from step 1.

GND-Bridge to S25FL127S Pin 7

Pin 7 is connected with Pullup-Resistor to 3.3V, to set FPGA in Quad-SPI Mode. To short this Pin with GND enable JTAG Bode Mode only.

Connect Pin 7 to one of the GND Pins only temporary for startup procedure. After startup, Pin 7 trace is used to program the Flash. So you must disconnect your GND-bridge.

 

 

References