Add SC598-HTOL board support

[ozan956]

Add support for the SC598-HTOL board.

Refactor CI build matrix to support board-specific configurations -> Just added a mechanism to select flavor and board fragment seperately.

Add htol.fragment with board configuration (U-Boot 2ff322c, Linux 984f676cc448) -> there is actually another patch on u-boot to introduce sd card support and to make boot options aligned with genimage.cfg. Instead of this patch, we can also change the genimage.cfg of the htol board.

Move patches and hash files from buildroot to br2-external -> to not affect buildroot

[ozan956]

After I merge everything in Linux and U-Boot and having releases, there will be only htol.fragment and changes in workflow to be merged.

[ozan956]

From the latest workflow run 🤔

2026-04-10T00:02:09.3479579Z >>>   Executing post-image script board/adi/ev-sc598-som/post-image.sh
2026-04-10T00:02:09.5264723Z curl: (60) SSL certificate problem: self-signed certificate
2026-04-10T00:02:09.5265358Z More details here: https://curl.se/docs/sslcerts.html
2026-04-10T00:02:09.5265675Z 
2026-04-10T00:02:09.5265976Z curl failed to verify the legitimacy of the server and therefore could not
2026-04-10T00:02:09.5266837Z establish a secure connection to it. To learn more about this situation and
2026-04-10T00:02:09.5267610Z how to fix it, please visit the webpage mentioned above.
2026-04-10T00:02:09.5276929Z make: *** [Makefile:834: target-post-image] Error 60
2026-04-10T00:02:09.7313485Z ##[error]Process completed with exit code 2.

I just re-run the workflow to see whether its consistent.

[ozan956]

From the latest workflow run 🤔

2026-04-10T00:02:09.3479579Z >>>   Executing post-image script board/adi/ev-sc598-som/post-image.sh
2026-04-10T00:02:09.5264723Z curl: (60) SSL certificate problem: self-signed certificate
2026-04-10T00:02:09.5265358Z More details here: https://curl.se/docs/sslcerts.html
2026-04-10T00:02:09.5265675Z 
2026-04-10T00:02:09.5265976Z curl failed to verify the legitimacy of the server and therefore could not
2026-04-10T00:02:09.5266837Z establish a secure connection to it. To learn more about this situation and
2026-04-10T00:02:09.5267610Z how to fix it, please visit the webpage mentioned above.
2026-04-10T00:02:09.5276929Z make: *** [Makefile:834: target-post-image] Error 60
2026-04-10T00:02:09.7313485Z ##[error]Process completed with exit code 2.

I just re-run the workflow to see whether its consistent.

Hello @gastmaier, can it be related with the containers? Has anything changed recently?

[gastmaier]

Fortiguard SDNS is tripping for  https://raw.githubusercontent.com/ , causing all out CI/CD to fail