7.45. Texas Instruments K3low

Trusted Firmware-A (TF-A) implements the EL3 firmware layer for Texas Instruments K3low SoCs. The first generation of K3 architecture based devices used a Cortex R5 processor as a primary boot loader. But the K3low SoC architecture removed the R5 processor and the MPU A53 acts as the primary bootloader. Due to the small static memory foot print on the k3low devices, a two stage boot load architecture is used. In the first stage BL1 boot loader configures and initializes the DDR4/LPDDR4 subsystem and resets back to the ROMCode for second stage booting of BL31 etc.

7.45.1. Boot Flow

TF-A BL1 --> TF-A BL31 --> BL32(OP-TEE) --> TF-A BL31 --> BL33(U-Boot) --> Linux
                                                    \
                                                Optional direct to Linux boot
                                                        \
                                                        --> BL33(Linux)

7.45.2. Build Instructions

TF-A:

make CROSS_COMPILE=aarch64-none-linux-gnu- ARCH=aarch64 PLAT=k3low TARGET_BOARD=am62lx-evm

For bl1 only binary builds:

make CROSS_COMPILE=aarch64-none-linux-gnu- ARCH=aarch64 PLAT=k3low TARGET_BOARD=am62lx-evm am62l_bl1

OP-TEE:

make ARCH=arm CROSS_COMPILE64=aarch64-none-linux-gnu- PLATFORM=k3 CFG_ARM64_core=y all

A53 U-Boot:

make ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- am62l_evm_defconfig
make ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- BL1=<path> BL31=<path> TEE=<path> BINMAN_INDIRS=<path>

7.45.3. Deploy Images

cp tiboot3.bin tispl.bin u-boot.img /sdcard/boot/