Flashing secure bootloader on the nRF52840 works with SEGGER Embedded but not with nrfjprog

RE: Flashing secure bootloader on the nRF52840 works with SEGGER Embedded but not with nrfjprog

bjorn-spockeli — Thu, 12 Dec 2019 10:23:28 GMT

The Thread and Zigbee SDK is based on SDK v15.3.0 where there is a known issue with the bootloader. It writes the bootloader start address and MBR parameter page address to the MBR section, so if one uses nrfjprog with the sectorerase option, then the MBR page will be erased so that the addresses can be written to the page. This has been fixed in SDK v16.0.0 where the bootloader now writes the addresses to the MBR at run-time the first time the bootloader runs.

Best regards

Bjørn

RE: Flashing secure bootloader on the nRF52840 works with SEGGER Embedded but not with nrfjprog

jdinh0608 — Wed, 11 Dec 2019 17:31:19 GMT

Hi Bjørn,

I was using the USB Secure Bootloader example in Thread & Zigbee SDK v3.0.0.

After switching to the one in SDK v16.0.0, I was able to get it working with

$ make erase flash flash_mbr

Those same exact steps did not work previously on the usb secure bootloader example in Thread & Zigbee SDK v3.0.0 (or v3.2.0) for me.

RE: Flashing secure bootloader on the nRF52840 works with SEGGER Embedded but not with nrfjprog

bjorn-spockeli — Wed, 11 Dec 2019 10:57:38 GMT

which SDK version are you using? Is it SDK v15.3.0 or SDK v16.0.0?

Best regards

Bjørn