Problem with hwdef.dat for a custom STM32H743VIH6 board

Hello,
I have designed my own board using an STM32H743VIH6 based on the MicoAir743 and NxtPX4v2.

Now I wanted to upload ardupilot to the board. I have written a minumum hwdef.dat file wich compiles. But after uploading and connecting with Missionplanner i get an config error: INS unable to initilize driver message.
Minimum HWDEF

hwdef(_dat).txt (784 Bytes)

I also wrote the following Bootloader hwdef:
hwdef-bl_dat.txt (876 Bytes)

Now the question is: Is there an obvious error in my config files or how should i proceed to debug the issue?