Finally found two ways to do this and worked in my case: 1. use bitbake -c diffconfig to create a fragment config and then add the fragment config to a .bbappend 2. add an out-of-tree defconfig in .bb The documentation says out-of-tree defconfig takes precedence. But in my case KBUILD_DEFCONFIG is used and the out-of-tree defconfig is dropped. No idea why. I have to use KBUILD_DEFCONFIG:remove to clear it.
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