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| author | Jens Wiklander <jens.wiklander@linaro.org> | 2015-12-07 14:37:10 +0100 |
|---|---|---|
| committer | Jens Wiklander <jens.wiklander@linaro.org> | 2016-06-09 11:23:28 +0200 |
| commit | 419e0d262be23fe3da6e4498ed8b0e2712410d14 (patch) | |
| tree | 31f1656a9846047b34a080c2a189b4dcf53da616 /docs | |
| parent | ae43c9493d2c6a2a878f3cee0c240c69fe88f130 (diff) | |
Add support for QEMU virt ARMv8-A target
This patch adds support for the QEMU virt ARMv8-A target.
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/plat/qemu.md | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/docs/plat/qemu.md b/docs/plat/qemu.md new file mode 100644 index 00000000..5e6bcbce --- /dev/null +++ b/docs/plat/qemu.md @@ -0,0 +1,44 @@ +ARM Trusted Firmware for QEMU virt ARMv8-A +========================================== + +ARM Trusted Firmware implements the EL3 firmware layer for QEMU virt +ARMv8-A. BL1 is used as the BootROM, supplied with the -bios argument. +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 Flattened Device Tree, FDT, generated by QEMU at run-time to +add a node describing PSCI and also enable methods for the CPUs. + +An ARM64 defonfig v4.5 Linux kernel is known to boot, FTD doesn't need to be +provided as it's generated by QEMU. + +Current limitations: +* Only cold boot is supported +* No build instructions for QEMU_EFI.fd and rootfs-arm64.cpio.gz +* No instructions for how to load a BL32 (Secure Payload) + +`QEMU_EFI.fd` can be dowloaded from +http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-KERNEL-AARCH64/RELEASE_GCC49/QEMU_EFI.fd + +Boot binaries, except BL1, are primarily loaded via semi-hosting so all +binaries has to reside in the same directory as QEMU is started from. This +is conveniently achieved with symlinks the local names as: +* `bl2.bin` -> BL2 +* `bl31.bin` -> BL31 +* `bl33.bin` -> BL33 (`QEMU_EFI.fd`) +* `Image` -> linux/Image + +To build: +``` +make CROSS_COMPILE=aarch64-none-elf- PLAT=qemu +``` + +To start (QEMU v2.6.0): +``` +qemu-system-aarch64 -nographic -machine virt,secure=on -cpu cortex-a57 \ + -kernel Image \ + -append console=ttyAMA0,38400 keep_bootcon root=/dev/vda2 \ + -initrd rootfs-arm64.cpio.gz -smp 2 -m 1024 -bios bl1.bin \ + -d unimp -semihosting-config enable,target=native +``` |