On 11/25/2019 3:22 PM, Andrey Smirnov wrote: > On Mon, Nov 25, 2019 at 12:02 AM Horia Geanta <horia.geanta@xxxxxxx> wrote: >> >> On 11/21/2019 5:56 PM, Andrey Smirnov wrote: >>> The TRNG as used in RNG4, used in CAAM has a documentation issue. The >> I assume the "erratum" consists in RTMCTL[TRNG_ACC] bit >> not being documented, correct? >> >> Is there an ID of the erratum? >> Or at least do you know what parts / SoCs have incorrect documentation? >> >>> effect is that it is possible that the entropy used to instantiate the >>> DRBG may be old entropy, rather than newly generated entropy. There is >>> proper programming guidance, but it is not in the documentation. >>> >> Is the "programming guidance" public? >> > > I don't know the answers to any of those questions. I am not the > original author of this change, just ported if from NXP tree because > it seemed important. More than happy to drop this if you think it's > bogus. > The implementation is fine. I am just trying to understand the commit message. Maybe Aymen, as author, could help. Otherwise I suggest rewriting it, i.e. drop the mention of an erratum and just say what's the problem in the RNG initialization code. Thanks, Horia
