[U-Boot] [PATCH v3 3/4] image: fdt: copy possible optee nodes to a loaded devicetree

Simon Glass sjg at chromium.org
Thu Nov 14 13:43:43 UTC 2019

On Wed, 23 Oct 2019 at 09:47, Heiko Stuebner <heiko at sntech.de> wrote:
> From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
> The loading convention for optee or any other tee on arm64 is as bl32
> parameter to the trusted-firmware. So TF-A gets invoked with the TEE as
> bl32 and main u-boot as bl33. Once it has done its startup TF-A jumps
> into the bl32 for the TEE startup, returns to TF-A and then jumps to bl33.
> All of them get passed a devicetree as parameter and all components often
> get loaded from a FIT image.
> OP-TEE will create additional nodes in that devicetree namely a firmware
> node and possibly multiple reserved-memory nodes.
> While this devicetree is used in main u-boot, in most cases it won't be
> the one passed to the actual kernel. Instead most boot commands will load
> a new devicetree from somewhere like mass storage of the network, so if
> that happens u-boot should transfer the optee nodes to that new devicetree.
> To make that happen introduce optee_copy_fdt_nodes() called from the dt
> setup function in image-fdt which after checking for the optee presence
> in the u-boot dt will make sure a optee node is present in the kernel dt
> and transfer any reserved-memory regions it can find.
> Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
> Reviewed-by: Jens Wiklander <jens.wiklander at linaro.org>
> ---
> changes in v2:
> - don't create a new optee firmware-node, but instead copy the
>   compatible+method properties from the old fdt blob.
> changes in v3:
> - move check for pre-existing optee node into main function
>   If the kernel-dts already contains optee nodes, we probably
>   want to leave it _completely_ alone
>  common/image-fdt.c  |   8 +++
>  include/tee/optee.h |   9 +++
>  lib/optee/optee.c   | 140 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 157 insertions(+)

Applied to u-boot-dm, thanks!

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