Hi Ayoub,

Thank you for providing more details about your question. MultiDTB mechanism is not supported by TF-A, and Arm does not plan to support it. Moreover, the link you mentioned is specific to MultiDTB support in U-boot, but it's not part of any standard,

so we believe the implementation shouldn't be part of generic code.

However, partners can contribute in a platform-specific manner to support MultiDTB mechanism.

You are welcome to contribute patches towards this work.

Thanks, Manish Badarkhe

From: Ayoub Zaki ayoub.zaki@embetrix.com Date: Thursday, 27 October 2022 at 14:32 To: Manish Badarkhe Manish.Badarkhe@arm.com, tf-a@lists.trustedfirmware.org tf-a@lists.trustedfirmware.org Subject: Re: [TF-A] Multi DTBs support in TF-A

Hi,

thanks for the link but I think you misunderstood my question, my goal is to have TF-A supporting multiple device configuration by packing all required DTBs into the one TF-A binary and do selection at bootup time by probing a gpio for example:

similar thing is implemented in u-boot for example:

https://github.com/u-boot/u-boot/blob/master/doc/README.multi-dtb-fit

Hi Ayoub,

TF-A supports both hardware and firmware device tree configurations. Usage of device tree configurations are explained in TF-A documentation[1]. If you need any further specific information, please contact us.

[1]: https://trustedfirmware-a.readthedocs.io/en/latest/design/firmware-design.ht... - dynamic-configuration-during-cold-boothttps://trustedfirmware-a.readthedocs.io/en/latest/design/firmware-design.html?#dynamic-configuration-during-cold-boot Thanks, Manish Badarkhe

From: Ayoub Zaki via TF-A tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org Date: Thursday, 13 October 2022 at 15:31 To: tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org Subject: [TF-A] Multi DTBs support in TF-A hello List,

Is there anyway to support Multi DTBs in TF-A ?

Mit freundlichen Grüßen / Kind regards

-- Ayoub Zaki Embedded Systems Consultant

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