There have been attempts to get op-tee node integrated upstream in the past [1][2]. The challenge is on how to handle the load and entry addresses where the op-tee image should be loaded to. Different SoC families and architectures have different RAM base addresses. Further the final addresses can vary from board to board (e.g. depending on populated RAM size). This approach follows the TI k3 kconfig solution. To be able to define a sensible default for the new config option, put it in the imx8m kconfig. For other imx families, the RAM start addresses are different and thus finding a common sensible default is not possible. I do not have a working Nano board so I was not able to test imx8mn.
I included usage for PHYTEC boards for examples (with documentation).
[1] https://patchwork.ozlabs.org/project/uboot/patch/20230622173006.3921891-1-th... [2] https://patchwork.ozlabs.org/project/uboot/patch/ZeHDVr-Bzm935-5N@mecka.net/
--- Changes in v2 (from RFC): - Use kconfig instead of trying pure dt approach. - Add load addresses in defconfigs instead of <board>-u-boot dts.
--- Yannic Moog (6): arm: imx8m: add OP-TEE node phycore-imx8mp_defconfig: add optee load address imx8mm-phygate-tauri-l_defconfig: add optee load address phycore-imx8mm_defconfig: add optee load address doc: phytec: imx8mp: add OP-TEE documentation doc: phytec: imx8mm: add OP-TEE integration instructions
arch/arm/dts/imx8mm-u-boot.dtsi | 17 ++++++++++++++++- arch/arm/dts/imx8mn-u-boot.dtsi | 17 ++++++++++++++++- arch/arm/dts/imx8mp-u-boot.dtsi | 17 ++++++++++++++++- arch/arm/mach-imx/imx8m/Kconfig | 8 ++++++++ configs/imx8mm-phygate-tauri-l_defconfig | 1 + configs/phycore-imx8mm_defconfig | 1 + configs/phycore-imx8mp_defconfig | 1 + doc/board/phytec/imx8mm-phygate-tauri-l.rst | 26 +++++++++++++++++++++++++- doc/board/phytec/phycore-imx8mm.rst | 25 ++++++++++++++++++++++++- doc/board/phytec/phycore-imx8mp.rst | 26 +++++++++++++++++++++++++- 10 files changed, 133 insertions(+), 6 deletions(-) --- base-commit: d88bcd6d247a2b5d1683e393d8c9dc0259cd29f0 change-id: 20240903-phytec_imx8m_optee-8674ef012a36
Best regards,