31. Rockchip SoCs
Trusted Firmware-A supports a number of Rockchip ARM SoCs from both AARCH32 and AARCH64 fields.
This includes right now: - px30: Quad-Core Cortex-A53 - rk3288: Quad-Core Cortex-A17 (past A12) - rk3328: Quad-Core Cortex-A53 - rk3368: Octa-Core Cortex-A53 - rk3399: Hexa-Core Cortex-A53/A72
31.1. Boot Sequence
- For AARCH32:
Bootrom –> BL1/BL2 –> BL32 –> BL33 –> Linux kernel
- For AARCH64:
Bootrom –> BL1/BL2 –> BL31 –> BL33 –> Linux kernel
BL1/2 and BL33 can currently be supplied from either: - Coreboot + Depthcharge - U-Boot - either separately as TPL+SPL or only SPL
31.2. How to build
Rockchip SoCs expect TF-A’s BL31 (AARCH64) or BL32 (AARCH32) to get integrated with other boot software like U-Boot or Coreboot, so only these images need to get build from the TF-A repository.
For AARCH64 architectures the build command looks like
make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl32
while AARCH32 needs a slightly different command
make ARCH=aarch32 CROSS_COMPILE=arm-linux-gnueabihf- PLAT=rk3288 AARCH32_SP=sp_min bl32
Both need replacing the PLAT argument with the platform from above you want to build for and the CROSS_COMPILE argument with you cross- compilation toolchain.
31.3. How to deploy
Both upstream U-Boot and Coreboot projects contain instructions on where to put the built images during their respective build process. So after successfully building TF-A just follow their build instructions to continue.