In U-Boot how should we configure an environment variable during boot up that would be just read-only. IOW setenv on this variable (in the U-Boot console or pragmatically) should not be allowed.
In U-Boot how should we configure an environment variable during boot up that would
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You probably have to modify U-Boot source code.
ethaddrhas a similar characteristic; once set,ethaddrcannot be modified. This characteristic is hardcoded.