Bootloader, that makes in armgcc doesn't work.

[Anton K.]

Hello, i use nRF5_SDK_12.3.0_d7731ad. I took this tutorial https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader and according to my nRF51422 compile my keil project. I Have good result in uploading firmware. But I have tried to make the the relevant action in armgcc project, bootloader successfully compiled and uploaded, i see advertising DfuTarg in my NRF connect at my phone, but i can't connect it, therefore i can't upload my firmware. Have someone the similar problem, or how can i fix my problem?
Best regards, Anton.

[Vidar Berg]

Hello Anton,

I have not seen this problem before. Have you made any changes to the code apart from changing keyset? Also, are you testing on a nRF52 DK, or a custom board, and what version of the GCC toolchain are you using?

Thanks.    

[Anton K.]

I have made no changes, just replace public key. I'm testing on DK PCA10028, using "7 2017-q4-major" GCC toolchain.
Thanks for you time.

[Vidar Berg]

We have seen some problems with the most recent versions of GCC 7 (e.g, in this thread). Recommend to try and older version and see if that helps. Alternatively, try to re-build the bootloader without link time optimization (i.e., remove -flto flag in makefile).

Note that we used GCC ARM Embedded 4.9 2015q3 for testing and verification of SDK 12.x.x. Full list of tested toolchains are included in the SDK release notes.

[Anton K.]

Thanks so much, it work! (i was remove -flto flag in makefile) How did you predict it? :)

[Vidar Berg]

In the thread I linked to earlier it was implied that there may be a LTO bug in GCC 7, but I have not looked much into it, so not sure what the root cause is unfortunately.