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https://github.com/ARM-software/arm-trusted-firmware.git
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419e0d262b
This patch adds support for the QEMU virt ARMv8-A target. Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
44 lines
1.7 KiB
Markdown
44 lines
1.7 KiB
Markdown
ARM Trusted Firmware for QEMU virt ARMv8-A
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==========================================
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ARM Trusted Firmware implements the EL3 firmware layer for QEMU virt
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ARMv8-A. BL1 is used as the BootROM, supplied with the -bios argument.
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When QEMU starts all CPUs are released simultaneously, BL1 selects a
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primary CPU to handle the boot and the secondaries are placed in a polling
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loop to be released by normal world via PSCI.
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BL2 edits the Flattened Device Tree, FDT, generated by QEMU at run-time to
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add a node describing PSCI and also enable methods for the CPUs.
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An ARM64 defonfig v4.5 Linux kernel is known to boot, FTD doesn't need to be
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provided as it's generated by QEMU.
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Current limitations:
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* Only cold boot is supported
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* No build instructions for QEMU_EFI.fd and rootfs-arm64.cpio.gz
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* No instructions for how to load a BL32 (Secure Payload)
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`QEMU_EFI.fd` can be dowloaded from
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http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-KERNEL-AARCH64/RELEASE_GCC49/QEMU_EFI.fd
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Boot binaries, except BL1, are primarily loaded via semi-hosting so all
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binaries has to reside in the same directory as QEMU is started from. This
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is conveniently achieved with symlinks the local names as:
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* `bl2.bin` -> BL2
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* `bl31.bin` -> BL31
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* `bl33.bin` -> BL33 (`QEMU_EFI.fd`)
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* `Image` -> linux/Image
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To build:
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```
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make CROSS_COMPILE=aarch64-none-elf- PLAT=qemu
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```
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To start (QEMU v2.6.0):
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```
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qemu-system-aarch64 -nographic -machine virt,secure=on -cpu cortex-a57 \
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-kernel Image \
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-append console=ttyAMA0,38400 keep_bootcon root=/dev/vda2 \
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-initrd rootfs-arm64.cpio.gz -smp 2 -m 1024 -bios bl1.bin \
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-d unimp -semihosting-config enable,target=native
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```
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