PCA10056 JLINK OB software missing

RE: PCA10056 JLINK OB software missing

p143 — Wed, 12 Dec 2018 14:41:38 GMT

The same happens to me (in this case using SDK v15.2.0) but as far, I couldn't find any culprit. I did exit Dropbox, One Drive, Google Drive and disabled Bitdefender but no matter what I do, after 30 seconds, the Bootloader directory keeps vanishing from my Windows Explorer. Apparently, It also disappears immediately when, before I reach this time limit, I try to paste on it the bin file "J-Link OB-SAM3U128-V2-NordicSemi 170724.bin" Nordic provided to me the first time I had this problem. I am sure there is a much smart method to solve this design flaw in the pca10056 board, other than trying forever. Thanks

RE: PCA10056 JLINK OB software missing

kgislason — Wed, 12 Sep 2018 13:39:23 GMT

Hi tesc,

Thanks for your reply. Dropbox was the culprit for the issue, after leaving the window open the mount point stayed and I could flash the JLINK OB software again.

RE: PCA10056 JLINK OB software missing

tesc — Wed, 12 Sep 2018 12:00:42 GMT

Hi,

It seems there is a misunderstanding here regarding two separate bootloaders and what is what.

First, there is our DFU bootloader, which is a piece of firmware that you put on the nRF5x SoC and that is responsible for performing firmware upgrades without the need of an external programmer.

Second, there is the interface MCU on our DKs, which in fact is an external programmer. (Although it is located on the board, it is external to the nRF.) This external programmer can itself be upgraded by entering a bootloader mode, and this is the bootloader mode that you trigger when pressing BOOT/RESET when powering the DK. (I.e. the bootloader that you see is that of the programmer, and has nothing to do with whatever happens to be on the nRF.)

There are known issues with this external programmer's bootloader mode, because it mounts what looks like a shared folder. Other applications such as Dropbox or image albums may see the newly mounted shared folder and think that they can do something with its content. Make sure not to select anything and not to close the popups from those applications. That way you should be able to use the folder yourself (as described in step 4 of the list you referred to.)

Regards,
Terje