On Tue, 2024-07-23 at 14:44 +0200, Stefano Manni wrote: > Hi, > > On Tue, 2024-07-23 at 14:24 +0200, Rouven Czerwinski wrote: > > > > This is a common warning on some i.MX6 devices which indicates a > > CAAM > > RNG self-test failure, see the description in > > drivers/crypto/caam/rng_self_test.c which should be run by the > > bootloader to ensure that the RNG part of the CAAM is not faulty. > > This requires the CAAM driver within barebox to be enabled. > > > > after enabling CAAM I see: > > rng_self_test: RNG software self-test passed > caam 2100000.crypto@xxxxxxxxxx: Instantiated RNG4 SH1 > > but the HAB warning is still there. > > I read from drivers/crypto/caam/rng_self_test.c that the warning is > a false positive due to an incorrect implementation of the RNG > self-test procedure in the boot ROM. > So running the RNG selftest in the bootloader shoul help find > real RNG failures that may be obfuscated by this false positive. > > Is correct my understanding? Yes, this is correct. You'll probably want to send a patch to modify the habv4_known_rng_fail_events[] array in drivers/hab/habv4.c, this should prevent it from being displayed as an error. Best regards, Rouven Czerwinski
