1QEMU SBSA Target 2================ 3 4Trusted Firmware-A (TF-A) implements the EL3 firmware layer for QEMU SBSA 5Armv8-A. While running Qemu from command line, we need to supply two Flash 6images. First Secure BootRom is supplied by -pflash argument. This Flash image 7is made by EDK2 build system by composing BL1 and FIP. Second parameter for Qemu 8is responsible for Non-secure rom which also given with -pflash argument and 9contains of UEFI and EFI variables (also made by EDK2 build system). Semihosting 10is not used 11 12When QEMU starts all CPUs are released simultaneously, BL1 selects a 13primary CPU to handle the boot and the secondaries are placed in a polling 14loop to be released by normal world via PSCI. 15 16BL2 edits the FDT, generated by QEMU at run-time to add a node describing PSCI 17and also enable methods for the CPUs. 18 19Current limitations: 20 21- Only cold boot is supported 22- No instructions for how to load a BL32 (Secure Payload) 23 24To build TF-A: 25 26:: 27 28 git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git tfa 29 cd tfa 30 export CROSS_COMPILE=aarch64-linux-gnu- 31 make PLAT=qemu_sbsa all fip 32 33Images will be placed at build/qemu_sbsa/release (bl1.bin and fip.bin). 34Need to copy them into top directory for EDK2 compilation. 35 36:: 37 38 cp build/qemu_sbsa/release/bl1.bin ../ 39 cp build/qemu_sbsa/release/fip.bin ../ 40 41Those images cannot be used by itself (no semihosing support). Flash images are built by 42EDK2 build system, refer to edk2-platform repo for full build instructions. 43 44:: 45 46 git clone https://github.com/tianocore/edk2-platforms.git 47 Platform/Qemu/SbsaQemu/Readme.md 48 49