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.. SPDX-License-Identifier: GPL-2.0+: QFW Bootmeth ============ `QEMU <hhttps://www.qemu.org/>`_ is a system emulator which is able to boot Operating Systems. QEMU provides specific support for booting an OS image provided on the QEMU command line. When invoked on a bootdev for UCLASS_QFW, this bootmeth reads the kernel provided by the QEMU `-kernel` argument, the initial ramdisk provided by `-initrd` and the boot arguments (command line) provided by `-append` into memory ready for booting. When the bootflow is booted, the bootmeth tries the `booti` option first, then falls back to the `bootz` option, then `zboot`. U-Boot's 'control' devicetree is passed through to the kernel on non-x86 devices. This works without needing `CONFIG_CMDLINE` enabled. The `bootflow read` command is supported, so it is possible to read the files and then check the kernel command-line before using `bootflow boot` to boot. The compatible string "u-boot,qfw-bootmeth" is used for the driver. It is present if `CONFIG_QFW` is enabled. |