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The CAAM in IMX parts doesn't support public key hardware acceleration (PKHA), so don't use RSA_FREESCALE_EXP. If you try to use it on IMX (assuming you have the clocks enabled first) you will get back an "Invalid KEY Command" error since PKHA isn't a valid key destination for these parts. Signed-off-by: George McCollister <george.mccollister@gmail.com> Reviewed-by: Tom Rini <trini@konsulko.com>