[PATCH] nvmem: ocotp: add support to revoke keys

[Denis Osterland-Heim]

Hi Sascha,

Am Montag, den 15.03.2021, 09:04 +0100 schrieb Sascha Hauer:
> Hi Denis,
>
> On Fri, Mar 12, 2021 at 02:39:40PM +0000, Denis Osterland-Heim wrote:
> > Hi,
> >
> > It would be no problem to do it in a script.
> > I did it as a fist prove of concept.
> > My opinion is, that this hard coded implementation give stronger
> > guarantee that this code is really executed.
>
> You could also create a C function which you call from your board code.
good Idea

>
> >
> > I would love to implement the HAB to check FIT signatures,
> > but with MMU enabled it will not work AFAIK and code requiring MMU disabled is not welcome.
>
> Are you sure it doesn't work? What I know is that the jump table for the
> HAB function is placed in the zero page which is set to faulting
> normally when the MMU is enabled. If that's the only problem we could
> solve that.
I would like to give it a try.

enable CONFIG_ARCH_HAS_ZERO_PAGE

zero_page_access();
pvt->some_function();
zero_page_faulting();

right?

Regards, Denis

>
> Sascha
>
>
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