XC7A200 on TE0712: Boot from flash only after one time programming with Xilinx tools

[UweBonnes]

I got new TE0712 modules. On a working setup, I replaced an old programmed modules with the new module. I could load the bitfile to FPGA, and the board worked as expected until reboot/repower. Then I wrote the binfile to flash. It compared okay. But the module, more exactly both modules i bought, did not boot from flash, neither by reset or repower.

To get the module bootable, I needed to use the Xilinix programmer once to program the flash. After the one-time xilinx programming, I can erase and reprogram flash and the setup boots from flash as expected.

Any ideas what openFPGAloader is missing on a virgin setup of FPGA/Flash to get flash bootable?