how to enable readback protection

[nimalhuang]

Hi, Guys,

I am trying to enable the readback protection for the code region 0 and code region 1, I know that the NRF_UICR->RBPCONF register is flash_backed, so I have to include uicr_config.h file and uncomment the line
const uint32_t UICR_RBPCONF attribute((at(0x10001004))) attribute((used)) = 0xFFFF0000;

However, I use eclipse and gcc, so it seems the "at" keyword doesn't apply in eclipse gcc, so is there any equivalence in gcc or how should I enable this readback protection in the application but not using nrfgo, I know that the nrfgo can definitely do that. Thank you:)

[Hung Bui]

I think you can follow what we did here to write the bootloader address to UICR:

__attribute__ ((section(".uicrBootStartAddress"))) uint32_t m_uicr_bootloader_start_address = BOOTLOADER_REGION_START;

Note: You would need to define the uicrBootStartAddress section in the .ld file as in gcc_nrf51_bootloader_xxaa.ld file.

Example project: bootloader - gcc - BLE - TestRBP.zip

[Hung Bui]

There should be no different between on the way to write to UICR. Could you try the example on github and check if the uicrBootStartAddress is written ? Which program you used to flash the chip ?