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24dba2b39f
The platform port documents are not very standardised right now and they don't integrate properly into the document tree so: 1) Make sure each port has a proper name and title (incl. owner) 2) Correct use of headings, subheadings, etc in each port 3) Resolve any naming conflicts between documents Change-Id: I4c2da6f57172b7f2af3512e766ae9ce3b840b50f Signed-off-by: Paul Beesley <paul.beesley@arm.com>
48 lines
1.7 KiB
ReStructuredText
48 lines
1.7 KiB
ReStructuredText
QEMU virt Armv8-A
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=================
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Trusted Firmware-A (TF-A) 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 defconfig v4.5 Linux kernel is known to boot, FDT 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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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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