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

Simon Glass
2019-10-22T00:17:00Z

Hi Heiko,

On Mon, 7 Oct 2019 at 18:22, Heiko Stuebner <heiko@sntech.de> wrote:
>
> 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@sntech.de>
> ---
> This goes together with my bl32 work for the spl_atf loader in
> https://patchwork.ozlabs.org/patch/1172565/
>
> common/image-fdt.c | 8 ++++
> include/tee/optee.h | 9 ++++
> lib/optee/optee.c | 112 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 129 insertions(+)

Could we please get a test for this new functionality?

Regards,
Simon