Error message
xillybus: Failed to obtain device tree resourceMeaning
This error indicates that something went wrong when attempting to read the Device Tree binary structure. The of_address_to_resource() kernel API function was called for obtaining the resource, but this call failed. This is most likely a result of a misconfigured device tree blob, or a badly functioning kernel.
Recommended action
This error should be reported to whoever generated the kernel image. It's by far not a normal condition.