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From: Denis Osterland-Heim <denis.osterland@diehl.com>
To: "sha@pengutronix.de" <sha@pengutronix.de>
Cc: "r.czerwinski@pengutronix.de" <r.czerwinski@pengutronix.de>,
	"barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: [PATCH] nvmem: ocotp: add support to revoke keys
Date: Tue, 16 Mar 2021 08:03:01 +0000	[thread overview]
Message-ID: <6005b0a0b4ac43ef1955de68612039e8e9451117.camel@diehl.com> (raw)
In-Reply-To: <20210315080437.GF23724@pengutronix.de>

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
>
>
Diehl Connectivity Solutions GmbH
Geschäftsführung: Horst Leonberger
Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
Nürnberg: HRB 32315

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  reply	other threads:[~2021-03-16  8:04 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-11 17:07 Denis Osterland-Heim
2021-03-12 10:15 ` Rouven Czerwinski
2021-03-12 14:39   ` Denis Osterland-Heim
2021-03-15  8:04     ` Sascha Hauer
2021-03-16  8:03       ` Denis Osterland-Heim [this message]
2021-03-16  8:11         ` sha

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