Short Description
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.
Xilinx tools do not handle DDR-Less Design FSBL autogeneration correctly. To get around this problem manual modifications are necessary, see DDR less ZYNQ Design.
Procedure
For this case, you can try the following steps without guarantee for success:
- Close all Xilinx Programs
- Power off TE0722
- Bridge S25FL127S Pin 7 temporary with GND to change Boot Mode to JTAG Bode Mode only (See picture).
- Power on TE0722
- Disconnect you GND bridge to Pin 7
- Open SDK
- Pprogram 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
- Zynq-7000 All Programmable SoC - Technical Reference Manual (UG585):Page 167-Section 6.25 Boot Mode Pin Settings
- TE0722 Schematics:TE0722 Download Page
- S25FL127SABMFV10 Datasheet
Overview
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