I followed the ECI-A install guide to create a bootable USB (have 2VMs, windows and linux) and then installed image to target uBuntu 18.04, and then reboot again to see the grup menu(one is Linux another is ACRN). when I enter ACRN, hang there and show booting 'ACRN' warnning: no console will be avaliable to OS as the attached.
coffee lake (i5-9500TE)
6 cores(s) / 6 Thread(s)
I would recommend that you first start with hardware from the validated list so we know the hardware and BIOS combination supports ACRN.
The following platforms have been validated for ACRN with ECI 2.5:
Vecow (TGL) - SPC-7100 with Intel® Core™ i7-1185GRE processor
Vecow (WHL) - SPC-5200 with Intel® Core™ i7-8665UE processor
Tiger Lake Reference Validation Platform** (TGL-RVP) - Intel® Core™ i5-1145GRE processor and Intel® Core™ i7-1185GRE processor
Elkhart Lake Customer Reference Board** (EHL-CRB) - Intel Atom® x6427FE processor
If, with one of these platforms, you still run into this issue, you might want to double check your BIOS settings and make sure those that are ACRN-related are properly configured. This is a common reason that leads to this issue.