Bootloader does not start application

RE: Bootloader does not start application

seanbites — Tue, 25 Oct 2016 13:36:03 GMT

If you are uploading an application via dfu service and through the bootloader, then you are most certainly not flashing the application + softdevice + bootlaoder via the Jlink programmer. The memory region 0x7f000 will be written to by the bootloader, to indicate that the application is valid or not after the CRC, which explains why it is not erased. The above command is only for the first time you flash the chip via Jlink programmer, not for after a dfu via bootloader.

RE: Bootloader does not start application

Kyle Krueger — Tue, 25 Oct 2016 09:14:12 GMT

When trying to enter this command I am receiving an error.

nrfjprog --family nrf52 --memwr 0x7F000 --val 1

Parsing parameters.

ERROR: The area to write is not erased.

Also, is there any reason this is not being automatically set when a DFU application update has been successful?

RE: Bootloader does not start application

seanbites — Tue, 08 Mar 2016 21:44:11 GMT

This worked really well thank you! If there are any others out there who need help on this, enter this command line for nrf52:
nrfjprog --family nrf52 --memwr 0x7F000 --val 1 and it is 0x3FC00 for nrf51

RE: Bootloader does not start application

Pavan kumar — Mon, 07 Mar 2016 18:03:31 GMT

Generally the bootloader initially checks weather a valid app is present or not in the DFU_BANK_0 by looking at the location BOOTLOADER_SETTINGS. If the p_bootloader_settings->bank_0 flag is set to 1. It assume that there is a valid app. generally it sets while doing dfu. So you can write this flag using jprog at location BOOTLOADER_SETTINGS. you can check bootloader_app_is_valid() function in bootoader.c for more info

RE: Bootloader does not start application

seanbites — Mon, 07 Mar 2016 17:49:28 GMT

Could you explain what you mean by " So once try to write the value 0x01 using jprog That may resolve the issue "? Thanks!

RE: Bootloader does not start application

Pavan kumar — Mon, 07 Mar 2016 16:48:21 GMT

I think the meged hex settings are different than the board that you are using. Any how in order to jump from bootloader mode to application the controller first checks weather there is valid flag set or not in the location BOOTLOADER_SETTINGS. So once try to write the value 0x01 using jprog That may resolve the issue