Hello, I would like modify how the `extlinux/extlinux.conf` file is create during build. I have figured out that the file responsible for the generation of this file is `poky/meta/classes/uboot-extlinux-config.bbclass`. I need to change the `UBOOT_EXTLINUX_FDT` value there and add an additional variable and parsing of it to the python code part (`FDTOVERLAYS`). For the former, I can change the value in some other custom conf file, as the `UBOOT_EXTLINUX_FDT` variable is already parsed in the given bbclass. Since `FDTOVERLAYS` is not handled at all in `poky/meta/classes/uboot-extlinux-config.bbclass`, I cannot do it the same way. I would need a `UBOOT_EXTLINUX_FDT` code there, but for the `FDTOVERLAYS`.
What is the best way to accomplish this? I thought initially that I could: 1. Somehow disable the default `poky/meta/classes/uboot-extlinux-config.bbclass`, 2. Overwrite it with a copy of this file that resides outside poky (inform the build system about this somehow), 3. Manually implement modifications in my bbclass file copy. If this is the way to go, then I just do now how to do this in practice. I would appreciate all help!
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