From the changelog:

4.2 Changes since release 2.0

  • Added support for DM7080.
  • If a recipe changes, the corresponding packages will be rebuilt automatically, in contrast to required manual PR bumps in the past.
  • Each machine uses its own tmp directory again, like before 2.0. However, there is a shared sstate-cache, which allows to share already compiled data between compatible machines. This impacts performance and size of the build system, but improves reliability and consistency across builds.
  • Support for machines without FPU and kernel versions below 3.x was dropped (DM800).
  • Layers under meta-bsp were combined into meta-dreambox.
  • Default package format switched from ipk (opkg) to deb (dpkg + apt).
  • dreambox-image was renamed to include the package format (dreambox-image-deb).

Bye Bye DM800 !!