Re: MCUboot - Signing image for slot 1 #mcuboot

Brenton Chetty

Hi Adam

Thank you for your reply. Sorry for the late response, as I have been getting sporadic results, i.e. sometimes the image upgrade works and most of the time it doesn't.

I have been using the following commands to sign and flash the image:
     rm -r build && west build -p auto -b nrf52840dk_nrf52840 samples/zephyr/hello-world/ -DCONFIG_BOOTLOADER_MCUBOOT=y -DDTC_OVERLAY_FILE="boards/nrf52840dk_nrf52840.overlay"
     west sign -t imgtool -- --key ~/zephyrproject/bootloader/mcuboot/root-rsa-2048.pem --header-size 0x200 --align 8 --version 3.0.2+1 --slot-size 0x67000 --pad && west flash --skip-rebuild -- --hex-file build/zephyr/zephyr.signed.hex

where the overlay file contains:
/ {
   chosen {
      zephyr,code-partition = &slot1_partition;

I used --pad for both slots. I've noticed that sometimes when I flash to slot 1, sometimes the primary image swap_type=0x2 (test) and sometimes it's 0x4 (revert).
I have confirmed that I am flashing my slot0 and slot1 images to the correct addresses (with padding).

I am not sure if the Version number plays a role in my error. Do you have any suggestions on the top of your mind as to why I am getting sporadic results with the firmware upgrades?

With thanks

On Tue, Oct 26, 2021 at 6:54 PM Adam Podogrocki <a.podogrocki@...> wrote:
Hi Brenton,

please try similar command: sign --key root-rsa-2048.pem --header-size 0x200 --align 8 --version <YOUR_VERSION> --slot-size <YOUR_SLOT_SIZE_IN_HEX> ZEPHYR_BIN_FILE NAME_OF_THE_SIGNED_FILE


On Mon, 25 Oct 2021 at 13:40, Brenton Chetty <brent7984@...> wrote:
1. Hi, how do I go about signing an image for slot1 usage.

I used the following command for flashing into slot0 successfully:
    west sign -t imgtool -- --key ~/zephyrproject/bootloader/mcuboot/root-rsa-2048.pem && west flash --skip-rebuild -- --hex-file build/zephyr/zephyr.signed.hex

I adjusted my nrf52840dk_nrf52840 config as follows to flash into slot1:
    chosen {
        zephyr,code-partition = &slot1_partition;

however when signing the image after this change, the offsets remain the same as it should be for slot 0
     === image configuration:
     partition offset: 49152 (0xc000)                     (slot 1 should start at 0x73000)
     partition size: 421888 (0x67000)
     rom start offset: 512 (0x200)

2. Is there any tutorials online for MCUboot usage on Zephyr?
I am attempting to get OTA firmware upgrade on my dev kit and I am not sure about the basic commands (Config Variables) to utilize mcuboot on zephyr.


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