3.9. ARM Trusted Firmware-AΒΆ
Overview
Trusted Firmware-A (TF-A) provides a reference implementation of secure world software for Armv7-A and Armv8-A, including a Secure Monitor executing at Exception Level 3 (EL3).
ATF is used as the initial start code on ARMv8-A cores for all K3 platforms. After setting up the initial core state and applying any needed errata fixes it sets up itself as the EL3 monitor handler. After this is installs the secure world software (OP-TEE) and passes execution on to either the Linux kernel or U-Boot in the non-secure world.
Getting the ATF Source Code
$ git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
Getting Security Dev Tool
$ git clone git://git.ti.com/security-development-tools/core-secdev-k3.git -b master
$ export TI_SECURE_DEV_PKG=`pwd`/core-secdev-k3
Building ATF
on GP
$ make CROSS_COMPILE=aarch64-linux-gnu- PLAT=k3 TARGET_BOARD=generic SPD=opteed
on HS
$ make CROSS_COMPILE=aarch64-linux-gnu- PLAT=k3 TARGET_BOARD=generic SPD=opteed
${TI_SECURE_DEV_PKG}/scripts/secure-binary-image.sh ./build/k3/generic/release/bl31.bin ./build/k3/generic/release/bl31.bin.signed
Default load locations
| ATF image | 0x70000000 |
| OP-TEE image | 0x9e800000 |
| U-Boot/Linux kernel image | 0x80080000 |
| DTB | 0x82000000 |
These can be changed from the defaults if needed in:
plat/ti/k3/board/generic/board.mk