08-04-2017 09:07 AM
We've got a relatively large number of Zynq 7002 based boards which were programmed to use secure boot mode.
We're using same type of board for a new project, and would like to reuse these boards.
Is it possible to reset secure boot mode somehow? We're not interested in the old firmware (which is stored in QSPI flash), we need just the hardware.
08-04-2017 09:21 AM
08-08-2017 01:32 AM
Yes, the eFUSE is burned to boot only in secure mode using the eFUSE key. I just was wondering, since other microcontrollers usually can be recovered from similar situations by a total erase. This is sad, it's possible the keys were lost, too much time passed.
08-08-2017 09:45 PM
I understand that the Xilinx eFuse really is a fuse (in polysilicon?) - it can only be blown once. A microcontroller with a "total erase" function will be using a different technology, probably EEPROM or Flash.