Hi,
In the last few quarter TF-M team have worked on actively to upstream the TF-M related features from the forked MCUboot repo to the original repository.
This activity has been finished recently and as a result the MCUboot fork has been removed from TF-M repo.
Currently TF-M exclusively relies on MCUboot project as a secure bootloader. From now on all new development will be directly contributed to the upstream repo.
List of feature which were upstreamed:
BR,
Tamas Ban