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70a4982d4f
Add documentation for the qfw bootmeth. Fix up the compatible string to drop the 'extlinux' part, which is not relevant to this bootmeth. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
21 lines
789 B
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21 lines
789 B
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.. SPDX-License-Identifier: GPL-2.0+:
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QFW Bootmeth
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============
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`QEMU <hhttps://www.qemu.org/>`_ is a system emulator which is able to boot
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Operating Systems. QEMU provides specific support for booting an OS image
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provided on the QEMU command line.
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When invoked on a bootdev for UCLASS_QFW, this bootmeth reads the kernel
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provided by the QEMU `-kernel` argument, the initial ramdisk provided by
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`-initrd` and the boot arguments (command line) provided by `-append` into
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memory ready for booting.
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When the bootflow is booted, the bootmeth tries the `booti` command first, then
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falls back to the `bootz` command. U-Boot's 'control' devicetree is passed
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through to the kernel.
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The compatible string "u-boot,qfw-bootmeth" is used for the driver. It is
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present if `CONFIG_QFW` is enabled.
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