1*4def07d5SDan HandleyTrusted Firmware-A for QEMU virt Armv8-A 2*4def07d5SDan Handley======================================== 36f625747SDouglas Raillard 4*4def07d5SDan HandleyTrusted Firmware-A (TF-A) implements the EL3 firmware layer for QEMU virt 5*4def07d5SDan HandleyArmv8-A. BL1 is used as the BootROM, supplied with the -bios argument. 66f625747SDouglas RaillardWhen QEMU starts all CPUs are released simultaneously, BL1 selects a 76f625747SDouglas Raillardprimary CPU to handle the boot and the secondaries are placed in a polling 86f625747SDouglas Raillardloop to be released by normal world via PSCI. 96f625747SDouglas Raillard 106f625747SDouglas RaillardBL2 edits the Flattened Device Tree, FDT, generated by QEMU at run-time to 116f625747SDouglas Raillardadd a node describing PSCI and also enable methods for the CPUs. 126f625747SDouglas Raillard 13*4def07d5SDan HandleyAn ARM64 defconfig v4.5 Linux kernel is known to boot, FDT doesn't need to be 146f625747SDouglas Raillardprovided as it's generated by QEMU. 156f625747SDouglas Raillard 166f625747SDouglas RaillardCurrent limitations: 176f625747SDouglas Raillard 186f625747SDouglas Raillard- Only cold boot is supported 196f625747SDouglas Raillard- No build instructions for QEMU\_EFI.fd and rootfs-arm64.cpio.gz 206f625747SDouglas Raillard- No instructions for how to load a BL32 (Secure Payload) 216f625747SDouglas Raillard 226f625747SDouglas Raillard``QEMU_EFI.fd`` can be dowloaded from 236f625747SDouglas Raillardhttp://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-KERNEL-AARCH64/RELEASE_GCC49/QEMU_EFI.fd 246f625747SDouglas Raillard 256f625747SDouglas RaillardBoot binaries, except BL1, are primarily loaded via semi-hosting so all 266f625747SDouglas Raillardbinaries has to reside in the same directory as QEMU is started from. This 276f625747SDouglas Raillardis conveniently achieved with symlinks the local names as: 286f625747SDouglas Raillard 296f625747SDouglas Raillard- ``bl2.bin`` -> BL2 306f625747SDouglas Raillard- ``bl31.bin`` -> BL31 316f625747SDouglas Raillard- ``bl33.bin`` -> BL33 (``QEMU_EFI.fd``) 326f625747SDouglas Raillard- ``Image`` -> linux/Image 336f625747SDouglas Raillard 346f625747SDouglas RaillardTo build: 356f625747SDouglas Raillard 366f625747SDouglas Raillard:: 376f625747SDouglas Raillard 386f625747SDouglas Raillard make CROSS_COMPILE=aarch64-none-elf- PLAT=qemu 396f625747SDouglas Raillard 406f625747SDouglas RaillardTo start (QEMU v2.6.0): 416f625747SDouglas Raillard 426f625747SDouglas Raillard:: 436f625747SDouglas Raillard 446f625747SDouglas Raillard qemu-system-aarch64 -nographic -machine virt,secure=on -cpu cortex-a57 \ 456f625747SDouglas Raillard -kernel Image \ 466f625747SDouglas Raillard -append console=ttyAMA0,38400 keep_bootcon root=/dev/vda2 \ 476f625747SDouglas Raillard -initrd rootfs-arm64.cpio.gz -smp 2 -m 1024 -bios bl1.bin \ 486f625747SDouglas Raillard -d unimp -semihosting-config enable,target=native 49