Default boot-loader for dongle

[Hiihtaja]

Hello !

1. I have found in internet bootloader for dongle graviton_bootloader_mbr_v1.0.1-\[nRF5_SDK_15.0.1-1.alpha_f76d012\].hex and able to flash and use it.

   But where I can found latest version of precompiled bootloaer what is based on latest SDK ?

  Or it should be compiled by myself from some known sources  ? Please point me to right page/code.

2. By using the bootloader and nrfutil, I'm able to create dfu.zip and update application only.

BUT

how  issue SW reset by using nrfutil without actual update ?

Sometimes I put dongle like HW to DFU by Reset mode and need to reboot it to normal boot without power on/off operation ?

How to erase application without actual update of it ? Just bootloader should remain.

Regards,

Eugene

[Simonr]

Hi again

I don't really see why you would put it in bootloader/DFU mode if you're not flashing any new firmware onto it? There is an "abort" command in DFU that resets the bootloader, but as far as I know this isn't implemented in nrfutil. What I would think is the easiest would be to either set an inactivity timer that trigs if no DFU is occurring.

Best regards,

Simon

[Hiihtaja]

Hi Simon !

It is just need for startup scripts. if NRF not respond, it might be in DFU mode. But looks like no way to detect if nRF in DFU mode and no way to initiate normal reboot. And power off/on toggling need for notmal boot to application if it flashed.

Is this so ?

Regards,

Eugene

[Simonr]

Hi

Either powering off/on or a timeout that aborts or ends the bootloader session would be the only ways to go back to the application mode. Would it be an issue to just assume that the Dongle is in DFU mode if it doesn't respond for your use case?

Best regards,

Simon

[Hiihtaja]

Hi !

Just to be sure if I understand all features of loader and nrfutils.

If dongle in DFU mode, how I can verify this by nrfutil ?

And if it in DFU mode and no any requests, it will reboot to normal mode automatically after what time ?

Regards,

Eugene