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Flash protection nrf52840 SDK: 14.0.0

VoidGreen

I am trying to implement a bootloader with rewrite protection on nrf52840 with SDK: 14.0.0. But it seems that there is no flash write protection registers in nrf52840. So is there a way to implement a flash rewrite protection?

Thanks.

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  • 0

    Hi,

    The BPROT peripheral that is found in the nRF52832, has been replaced with the ACL peripheral on the nRF52840. ACL works similar to the BPROT(erase/write protection), but also adds support for protection against reading the flash.

    You can find more information about the ACL here.

  • 0 in reply to Sigurd

    Hi,

    Thanks for the link! I tried this code:

    #define BOOTLOADER_START    *(uint32_t *) (NRF_UICR_BOOTLOADER_START_ADDRESS)
#define BOOTLOADER_LENGTH   0x0000D000
#define ALC_WR_PROTECT      0x00000002
NRF_ACL->ACL[0].ADDR = BOOTLOADER_START;
NRF_ACL->ACL[0].PERM = ALC_WR_PROTECT;
NRF_ACL->ACL[0].SIZE = BOOTLOADER_LENGTH;
nrf_nvmc_page_erase(BOOTLOADER_START);

    And after that first bootloader page (BOOTLOADER_START) is erased and all blank with 0xFF. Did I miss something?

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  • 0 in reply to Sigurd

    Hi,

    Thanks for the link! I tried this code:

    #define BOOTLOADER_START    *(uint32_t *) (NRF_UICR_BOOTLOADER_START_ADDRESS)
#define BOOTLOADER_LENGTH   0x0000D000
#define ALC_WR_PROTECT      0x00000002
NRF_ACL->ACL[0].ADDR = BOOTLOADER_START;
NRF_ACL->ACL[0].PERM = ALC_WR_PROTECT;
NRF_ACL->ACL[0].SIZE = BOOTLOADER_LENGTH;
nrf_nvmc_page_erase(BOOTLOADER_START);

    And after that first bootloader page (BOOTLOADER_START) is erased and all blank with 0xFF. Did I miss something?

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