[yocto] How to search for the .bb of .bbappen file in which a variable is set?

[Roberto Saltini]

For example, I would like to know in which .bb of .bbappend file the
variable PREFERRED_PROVIDER_u-boot is set.



The only (dummy) way that I have figured out up to now is to use grep.



Does anyone know a better way?



Thanks.

R.
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