An empty sources.list file in the system with the official image for Radxa Zero 3e

Zero Series
1

Good afternoon, everyone! I purchased a Radxa Zero 3e, I’m trying to experiment with a working kernel in the system. For this, I need the kernel source codes.
On a running official system, this is the ‘linux-image-5.10.160-26- rk356x’
I have not found the source texts of this version of the kernel in official sources.
I tried to install them on the system itself, but the sources.list file contains only the entry ‘deb Index of /debian bullseye main contrib non-free’
and I need the ‘deb-src’ Uri.
I am attaching a screenshot.
image
I ask for help from either the users who solved this riddle, or the developers of the system for Radxa.

Thanks in advance.

2

Please check this: https://radxa-repo.github.io/bsp/

3

Thanks, I’m studying it.I’ll answer as soon as I figure it out.

4

I read the manual, but it did not clarify in any way how to fill the sources.list file with lines with ‘deb-src’. Please tell me how to do this or how to install the source codes of the kernel currently running on the system in another way. Thank you.

5

This document is the tutorial of our compilation of the kernel software package, we do not have deb-src, because we use fpm for packaging

6

I got it, thanks. That’s not how it works here, thank you.
And I apologize again - there is not a word about fpm in this documentation. How would I know about this?