yocto kernel-patching BSP Layer


I have a ccimx6ulstarter Board with Yocto. I need to apply an own linux-kernel patch, so i wanted to use the yocto-inbuild tools "yocto-kernel patch list " to show all patches already applied. The BSp-name should be the machine name configuerd in the.conf file (it says “ccimx6ulstarter”). But yocot-kernel patch list ccimx6ulstarter only throws error:

Unable to find the BSP layer for machine ccimx6ulstarter.
Please make sure it is listed in bblayers.conf

What is wrong here?

Thank you for your help!