@Fred-Rauch As @fossette said, the Omega2 FW is built on LEDE. At this time, it seems the LEDE board profile for the Omega2 is not published yet. I'm regularily checking the LEDE github repo and in particular the pull requests for it, hoping Omega2 support will soon land there.
But yes, I got it (partially) working already :-)
The LinkItSmart7688 is a very close relative to the Omega2 (same chip, MT7688), so I just used the LinkIt profile.
An important difference is that the LinkitSmart uses ttyS2 as console, while Omega2 uses ttyS0. So I had to change the tty in the "bootargs" line in the "LINKIT7688.dts" device tree file, and remove the serial0-to-uart2 alias definition.
With that, I could build an image the Omega2 bootos up ok with, and gets accessible via the Ethernet expansion! WiFi access point also worked, but I didn't get it to connect to my WiFi as a client (didn't try hard, though).
For sure there are a lot of other details which are not exactly right in the LinkIt image for the Omega (e.g. LEDs, reset button). So this is for early experiments, but not for real use yet. We need to wait for the official platform support from Onion to appear in LEDE.
great stuff, please keep us posted! thanks!