The device trees comes directly from the Xilinx kernel
(https://github.com/Xilinx/linux-xlnx) . It seems like in the focal
kernel the overlay for the KV260 SOM did not set a compatible string so
the it fell back to the compatible string defined by the baseboard
(zynqmp-smk-k26-revA.dts) . When a
** Description changed:
While testing J/xilinx, I noticed that the keyword we use to grep from
/proc/device-tree/compatible has to be changed into kv26 instead of k26
that we used for F/xilinx
J/xilinx:
$ cat /proc/device-tree/compatible
"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
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