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The secure keys (TDKEK, JDKEK, TDSK) can only be generated once after a POR. Otherwise the RNG4 will throw an error. Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Horia Geantă <horia.geanta@nxp.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>