A20 Kernel Rebuild process

[Atreyo tech]

Hi,

Currently, I am start working on A20 board. For that, I download os file from this:
http://images.olimex.com/release/a20/

I downloaded A20-OLInuXino-buster-base-20210513-112230.img.7z, which works properly in my A20. Now, I want kernel source of this image file for modify kernel. Where I can get it?

Also please guide me for kernel rebuild process in A20.

[LubOlimex]

Sources are here:

https://github.com/OLIMEX/olimage

The build scripts are here:

https://github.com/OLIMEX/olimage/blob/master/build.sh

For more links and information refer to this document:

https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf