Hello Geoffroy,
Am using release 2.2 for ACRN loading Ubuntu 18.04 as SOS.

Following all the steps listed here with the only exception is that I am using different hardware.
https://projectacrn.github.io/latest/getting-started/rt_industry_ubuntu.html

I have attached my hardware specific board.xml file, CPUid.txt and 40_custom file indicating my boot parameters.
I have also uploaded output from lshw detailing hardware information for my platform.

Please let me know if any additional details are required.

I also do not have serial port so can't interact with ACRN hypervisor.

Thanks in advance for helping..