[yocto] Image not staring after upgrade from sumo to thud

[Pierluigi Greto]

Hi all,

I have several platforms and I have upgrade Yocto from sumo to thud. 
Most of them works fine after the upgrade, but some of them are not 
starting. Basically after I install the image and I have chose my OS in 
grub, the system reboot. But if I create the image using sumo, the image 
is working fine.
My system is a x86 arch. I have read the guide for migrating from sumo 
to thud and I was using COMPATIBLE_MACHINE for kernel multiconfig. I 
have fix this because it's known issue. But other than that, I don't 
know why it's not working (also because most of the other platforms are 
working as with sumo).
Any suggestions?
Thank you.

Best,
Pierluigi