"K26" is the name of the SOM (System-on-Module).
"KV260" is the name of the SOM + Base board.
I am guessing the Base board overlay was applied on Jammy, but not on Focal.
I think Jammy is correct.
Better to check U-Boot applied the overlay before booting the kernel.
BTW, I checked the focal kernel tree, but did not find "K26". Where did that device tree come from?
"K26" is the name of the SOM (System-on-Module).
"KV260" is the name of the SOM + Base board.
I am guessing the Base board overlay was applied on Jammy, but not on Focal.
I think Jammy is correct.
Better to check U-Boot applied the overlay before booting the kernel.
BTW, I checked the focal kernel tree, but did not find "K26". Where did that device tree come from?