You specified a custom build path outside the SDK installation directory.
That may not work as you expect. Suggestions:
1. Specify the path _under_ the directory where you installed the SDK
2. The script can create a directory, but it cannot create a directory
hierarchy. For instance, if the directory <SDK_INST_PATH>/build/
does not exist and you specify -b build/p2020rdb, the script will
not create it for you, mkdir build/ first.
3. Make sure you _source_ fsl_setup_poky script instead of running
it in a subshell.
Have a great day,
Platon
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