Question about "Command" window messages

[Artem Zemlyanukhin]

Hello,

During programming bootloader provided with sdk I get some messages in Command window in Keil.

Load "C:\Keil\ARM\Device\Nordic\nrf51822\Board\nrf6310\device_firmware_updates\bootloader\arm\_build\bootloader.axf"

• JLink Info: J-Link: Flash download: Flash programming performed for 2 ranges (14336 bytes) ***JLink Error: Programming failed @ address 0x10001000 (block verification error) Verification failed @ address 0x0003C800
• JLink Info: J-Link: Flash download: Total time needed: 0.471s (Prepare: 0.108s, Compare: 0.008s, Erase: 0.014s, Program: 0.330s, Verify: 0.000s, Restore: 0.009s) BS \bootloader../main.c\234

What does it mean?

Regards Artem

[Artem Zemlyanukhin]

But it seems that bootloader works ok despite of error messages.

[Ole Morten]

The errors indicate that the verification that checks that the flash have been written correctly fails. This shouldn't normally happen, and if it does I would at least not expect the bootloader to work.

Can you check and see if you also get this error if you try downloading the bootloader right after having done an erase all and flashed a new softdevice?

[Artem Zemlyanukhin]

yes, I get this error anyway except in case of programming via "Flash->Downlaod" in Keil. If I use "Debug->Start/Stop Debug session" I always get errors.

but I am sure bootloader works. I can see DFU device via BLE and write to flash new firmware using Master Control Panel or Android app.