The purpose of this series is to allow booting an OP-TEE image from SPL, by corectly configuring the TrustZone (TZC) memory regions.
Although TZC400 is a generic silicon logic that could apply to other mach- families, support is currently restricted to stm32mp. I have neither a feasible way nor interest in validating this for other chips. It's fairly trivial to move the code from mach- to arch/, should another use case arise.
The configuration of the memory regions is devicetree-driven, so there isn't much to hardcode, However the delineation between OP-TEE secure memory and shared memory is not given in the devicetree. This is the one thing that has to be hardcoded.
Although a variable CONFIG_OPTEE_TZDRAM_SIZE exists which advertises to do exactly the above, it is not suitable. This variable is used in u-boot proper, and is dependent on lib/optee being enabled. CONFIG_SPL_OPTEE, used herein, is independent of lib/optee. Thus, CONFIG_OPTEE_TZDRAM_SIZE is not guaranteed to exist
Changes since v1: - Removed "Weak functions are stupid" comment - Addressed blank line complaints from checkpatch
Alexandru Gagniuc (5): spl: mmc: Support OP-TEE payloads in Falcon mode spl: Introduce spl_board_prepare_for_optee() hook arm: stm32mp: Implement support for TZC 400 controller stm32mp1: spl: Configure TrustZone controller for OP-TEE ARM: dts: stm32mp: Add OP-TEE reserved memory to SPL dtb
arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi | 3 + arch/arm/mach-stm32mp/Makefile | 1 + arch/arm/mach-stm32mp/include/mach/tzc.h | 33 ++++++ arch/arm/mach-stm32mp/spl.c | 84 ++++++++++++++ arch/arm/mach-stm32mp/tzc400.c | 133 +++++++++++++++++++++++ common/spl/spl.c | 5 + common/spl/spl_mmc.c | 6 +- include/spl.h | 14 +++ 8 files changed, 277 insertions(+), 2 deletions(-) create mode 100644 arch/arm/mach-stm32mp/include/mach/tzc.h create mode 100644 arch/arm/mach-stm32mp/tzc400.c