Re: Device Tree call: Define Secure Data Path reserved memory

On Fri, Feb 11, 2022 at 8:21 AM Bill Mills bill.mills@linaro.org wrote:

Rob,

Can you confirm for the DT call on Feb 21?

I'm on holiday on the 21st.

Oliver,

On 2/11/22 4:54 AM, Olivier Masse wrote:

...

Hi Bill,

NXP had a discussion with Linaro about this optee os issue: https://github.com/OP-TEE/optee_os/issues/5133

Which is implemented by this first draft here: https://github.com/OP-TEE/optee_os/pull/5149

Could we be part of the next Device Tree call to discuss about adding a reserved memory in optee os embedded DT ?

Thanks for bringing it up. I have skimmed the PR threads and the discussion seems to be:

1. OP-TEE internal issues
2. DT standards questions and issues

For the DT call we need to focus on #2 above. We will definitely need Rob for this discussion so we need to do it when he can join. (If we don't resolve the question in this email thread before then.)

Context for all:

SDP here is related to DRM protected playback of media streams.

Jens comment in PR:

...

So far we have managed to avoid defining our own bindings in OP-TEE, instead we've been able to reuse already established bindings. With this you're proposing something new. I'm not sure of the best way of doing such a thing. Are we sure there is nothing to reuse? If not: How should it be reviewed? Who should review it?

DTS in PR: /*

• Copyright (c) 2021, NXP. All rights reserved.
• SPDX-License-Identifier: BSD-3-Clause

*/

/dts-v1/;

/ { #address-cells = <1>; #size-cells = <0>;

    reserved-memory {
            #address-cells = <1>;
            #size-cells = <1>;

            sdp_mem {
                    compatible = "optee-sdp";
                    reg = <0x3E800000 0x00400000>;
            };
    };

};

However it was modified after that.

Oliver: please reply to this thread (on list please) with the final DTS you are proposing. fix DT conventions and what are you doing with the no-map property if anything.

Is the memory above meant to be visible to NS world AND S world? Or is just for secure world.

Thanks, Bill

...

Best regards, Olivier Masse

-- Bill Mills Principal Technical Consultant, Linaro +1-240-643-0836 TZ: US Eastern Work Schedule: Tues/Wed/Thur _______________________________________________ boot-architecture mailing list -- boot-architecture@lists.linaro.org To unsubscribe send an email to boot-architecture-leave@lists.linaro.org