Messages in this thread | | | Subject | Re: [Linux-stm32] [PATCH v2 00/14] Introduce STM32MP1 RCC in secured mode | From | Ahmad Fatoum <> | Date | Thu, 11 Mar 2021 16:49:09 +0100 |
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Hello,
On 11.03.21 16:18, Alexandre TORGUE wrote: >> I raised this issue before with your colleagues. I still believe the correct way >> would be for the TF-A to pass down either a device tree or an overlay with the >> actual settings in use, e.g.: >> >> - Clocks/Resets done via SCMI >> - Reserved memory regions >> >> If TF-A directly boots Linux, it can apply the overlay itself, otherwise it's >> passed down to SSBL that applies it before booting Linux. > Discussing with tf-a and u-boot guys, this solution could imply hard synchronization between tf-a/u-boot. The most simple remains a "secure" dts.
OP-TEE can be configured via CFG_EXTERNAL_DTB_OVERLAY to pass along an overlay that describes the reserved memory regions it uses.
A similiar approach could work here. The only synchronization you need in Linux is to keep phandles that the overlay can reference.
Cheers, Ahmad
> > regards > Alex > >> Cheers, >> Ahmad >> >>> >>> Gabriel, can you wait a bit before sending something about SCMI in dtsi, I would like to align this strategy internally. >>> >>> Marek, Alex: thanks for your inputs. >>> >>> Regards >>> Alex >>> >>>>> The third could be the less costly. >>>> >>>> [...] >>> _______________________________________________ >>> Linux-stm32 mailing list >>> Linux-stm32@st-md-mailman.stormreply.com >>> https://st-md-mailman.stormreply.com/mailman/listinfo/linux-stm32 >> >
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