MT7628 target not booting kernel 5.15.x

When trying to use the test kernel version 5.15 my MT7628 target is not booting at all. It stops directly after uncompressing the Kernel.

3: System Boot system code via Flash.(0xbc050000)
do_bootm:argc=2, addr=0xbc050000
## Booting image at bc050000 ...
   Uncompressing Kernel Image ... OK
No initrd
## Transferring control to Linux (at address 80000000) ...
## Giving linux memsize in MB, 64

Starting kernel ...

Kernel 5.10.x works just fine with the same "initial" console output. Any idea where to start troubleshooting since I have no log at all to give me any hints.