Protect UICR

[Albin]

Hello i have a rigado BMD-300 module and i would like to flash a new version of softdevice app and bootloader but i want to protect the UICR memory because that is where the MAC addr of the module is stored. 

Is there any way to flash everything without touching the UICR ?

If so can you tell me a better way do to this ?

Thanks for the help

[run_ar]

UICR will be deleted if you erase all. However if you erase only the pages you use for your application you should be able to flash again without erasing the uicr. i.e. use the sector erase option when programming with nRFjprog.

     --program <hex_file> [--sectorerase | --chiperase | --sectoranduicrerase]
                             [--qspisectorerase | --qspichiperase]
                             Programs the specified hex_file into the device.
                             If the target area to program is not erased, the
                             --program operation will fail unless an erase
                             option is given. Valid erase operations for
                             the internal flash memory are --sectorerase,
                             --sectoranduicrerase and --chiperase. If
                             --chiperase is given, all the available user
                             non-volatile memory, including UICR, will be
                             erased before programming. If --sectorerase is
                             given, only the targeted non-volatile memory pages
                             excluding UICR will be erased. If
                             --sectoranduicrerase is given, only the targeted
                             non-volatile memory pages including UICR will be
                             erased. Note that the --sectoranduicrerase and
                             --sectorerase operations normally take
                             significantly longer time compared to --chiperase
                             operation so use them with caution. If your
                             device is equipped with a QSPI peripheral and an
                             external memory device is present, data targeting
                             the XIP region will be written to the external
                             memory device. The first address of the XIP region
                             is considered as address 0 of the external memory
                             device. To determine if an external memory device
                             is present, nrfjprog checks the MemSize paramter
                             from QspiDefault.ini file or from the QSPI
                             configuration ini file given with the --qspiini
                             option. If the target area to program is not
                             erased, the --program operation will fail unless
                             an erase option is given. Valid erase operations
                             for the external memory device are --qspichiperase
                             and --qspisectorerase. If --qspichiperase is
                             given, the external memory device will be erased.
                             If the --qspisectorerase is given, only 4kB pages
                             pages from the targeted external memory device
                             will be erased. Note that --qspichiperase
                             operation may take several minutes. The --program
                             command can be combined with the --verify
                             operation. It can also be combined with either the
                             --reset or the --debugreset operations. the reset
                             will occur after the flash operation in order to
                             start the execution.
                             Limitations:
                             For nRF51 devices, the --sectoranduicrerase
                             operation is not available.
                             For nRF51 devices, if the hex_file provided
                             contains sectors belonging to region 0, the
                             --program operation will fail.
                             For nRF51 devices, the --qspisectorerase and
                             --qspichiperase operations are not available.
                             For nRF52 devices, the --qspisectorerase and
                             --qspichiperase operations are not available
                             unless the device is equipped with a QSPI
                             peripheral and an external memory is connected. To
                             determine if an external memory is present, the
                             MemSize parameter from QspiDefault.ini file or
                             from the QSPI configuration ini file given with
                             the --qspiini option is evaluated

[inghowe83]

Can provide an example of the command? Lets said I would like to protect my serial number from been erased.

And the example of the serial I will write to is as below:

nrfjprog -f nrf52 --memwr 0x10001080 --val 0xCAFEBABE