Secure bootloader & buttonless dfu

RE: Secure bootloader & buttonless dfu

Hung Bui — Tue, 12 Mar 2019 09:46:19 GMT

Please clarify if you have tested our ble_app_buttonless_dfu ? Please don't start with your application before you test the example with our bootloader.

You need to generate bootloader setting so that the bootloader knows (after you flash with Jlink) that there is a valid application so it won't stay in DFU mode.

If you don't generate bootloader setting (and flash it) you would need to do a normal DFU for the buttonless application first, and then you can test the buttonless feature.

RE: Secure bootloader & buttonless dfu

jsmoon — Tue, 12 Mar 2019 00:20:18 GMT

Thank you for your reply.

Let me clarify exactly what we want to do.

We will use our own secure_bootloader as we mentioned above for now.

Then we are going to add following functions into app project:

sd_power_gpregret_clr(0, 0xffffffff);
sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

Once we enter a value through uart port the above routine will be executed.

However, right after download using J-Link the device boot as DFU mode.

If we have missing points please let me know.

Thank you

RE: Secure bootloader & buttonless dfu

Hung Bui — Mon, 11 Mar 2019 15:01:21 GMT

Hi Jsmoon,

Please clarify that you can do buttonless DFU using our example ble_app_buttonless_dfu (no merging with your app). Please follow the instruction in the blog and in the SDK on how to test buttonless DFU.

Be aware that you still need the bootloader when you use buttonless.