diff options
Diffstat (limited to 'docs/plat/qemu.rst')
| -rw-r--r-- | docs/plat/qemu.rst | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/docs/plat/qemu.rst b/docs/plat/qemu.rst index 4ebe64b85..88196bc93 100644 --- a/docs/plat/qemu.rst +++ b/docs/plat/qemu.rst @@ -10,7 +10,11 @@ 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 defconfig v4.5 Linux kernel is known to boot, FDT doesn't need to be +If ``ARM_LINUX_KERNEL_AS_BL33`` is set to 1 then this FDT will be passed to BL33 +via register x0, as expected by a Linux kernel. This allows a Linux kernel image +to be booted directly as BL33 rather than using a bootloader. + +An ARM64 defconfig v5.5 Linux kernel is known to boot, FDT doesn't need to be provided as it's generated by QEMU. Current limitations: @@ -20,7 +24,7 @@ Current limitations: - 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 +http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/latest/QEMU-KERNEL-AARCH64/RELEASE_GCC5/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 @@ -29,7 +33,7 @@ is conveniently achieved with symlinks the local names as: - ``bl2.bin`` -> BL2 - ``bl31.bin`` -> BL31 - ``bl33.bin`` -> BL33 (``QEMU_EFI.fd``) -- ``Image`` -> linux/Image +- ``Image`` -> linux/arch/arm64/boot/Image To build: @@ -37,12 +41,12 @@ To build: make CROSS_COMPILE=aarch64-none-elf- PLAT=qemu -To start (QEMU v2.6.0): +To start (QEMU v4.1.0): .. code:: shell qemu-system-aarch64 -nographic -machine virt,secure=on -cpu cortex-a57 \ -kernel Image \ - -append console=ttyAMA0,38400 keep_bootcon root=/dev/vda2 \ + -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 |