20. QEMU SBSA Target¶
Trusted Firmware-A (TF-A) implements the EL3 firmware layer for QEMU SBSA Armv8-A. While running Qemu from command line, we need to supply two Flash images. First Secure BootRom is supplied by -pflash argument. This Flash image is made by EDK2 build system by composing BL1 and FIP. Second parameter for Qemu is responsible for Non-secure rom which also given with -pflash argument and contains of UEFI and EFI variables (also made by EDK2 build system). Semihosting is not used
When QEMU starts all CPUs are released simultaneously, BL1 selects a primary CPU to handle the boot and the secondaries are placed in a polling loop to be released by normal world via PSCI.
BL2 edits the FDT, generated by QEMU at run-time to add a node describing PSCI and also enable methods for the CPUs.
Only cold boot is supported
No instructions for how to load a BL32 (Secure Payload)
To build TF-A:
git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git tfa cd tfa export CROSS_COMPILE=aarch64-linux-gnu- make PLAT=qemu_sbsa all fip
Images will be placed at build/qemu_sbsa/release (bl1.bin and fip.bin). Need to copy them into top directory for EDK2 compilation.
cp build/qemu_sbsa/release/bl1.bin ../ cp build/qemu_sbsa/release/fip.bin ../
Those images cannot be used by itself (no semihosing support). Flash images are built by EDK2 build system, refer to edk2-platform repo for full build instructions.
git clone https://github.com/tianocore/edk2-platforms.git Platform/Qemu/SbsaQemu/Readme.md