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| author | Simon Glass <sjg@chromium.org> | 2024-07-17 09:30:56 +0100 |
|---|---|---|
| committer | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2024-07-19 13:54:54 +0200 |
| commit | 70a4982d4fd83d18cd1951b2be9f3e7538b8c499 (patch) | |
| tree | 186bbc130bc4c7cdde7c448c53ceda8e2aad43e5 /doc | |
| parent | 64a1446bd09ec58ab259c9ec2b3160ac604b734f (diff) | |
| download | u-boot-70a4982d4fd83d18cd1951b2be9f3e7538b8c499.zip u-boot-70a4982d4fd83d18cd1951b2be9f3e7538b8c499.tar.gz u-boot-70a4982d4fd83d18cd1951b2be9f3e7538b8c499.tar.bz2 | |
doc: Add a description for bootmeth_qfw
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>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/develop/bootstd/index.rst | 1 | ||||
| -rw-r--r-- | doc/develop/bootstd/overview.rst | 1 | ||||
| -rw-r--r-- | doc/develop/bootstd/qfw.rst | 20 |
3 files changed, 22 insertions, 0 deletions
diff --git a/doc/develop/bootstd/index.rst b/doc/develop/bootstd/index.rst index 5052afe..f8fce72 100644 --- a/doc/develop/bootstd/index.rst +++ b/doc/develop/bootstd/index.rst @@ -9,3 +9,4 @@ Standard Boot overview extlinux pxelinux + qfw diff --git a/doc/develop/bootstd/overview.rst b/doc/develop/bootstd/overview.rst index 6afa1c2..ef87896 100644 --- a/doc/develop/bootstd/overview.rst +++ b/doc/develop/bootstd/overview.rst @@ -423,6 +423,7 @@ Bootmeth drivers are provided for booting from various media: - VBE - EFI boot using boot manager - Android bootflow (boot image v4) + - :doc:`QFW <qfw>`: QEMU firmware interface Each driver is controlled by a Kconfig option. If no bootmeth driver is selected by a compatible string in the devicetree, all available bootmeth diff --git a/doc/develop/bootstd/qfw.rst b/doc/develop/bootstd/qfw.rst new file mode 100644 index 0000000..70086ad --- /dev/null +++ b/doc/develop/bootstd/qfw.rst @@ -0,0 +1,20 @@ +.. 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` command first, then +falls back to the `bootz` command. U-Boot's 'control' devicetree is passed +through to the kernel. + +The compatible string "u-boot,qfw-bootmeth" is used for the driver. It is +present if `CONFIG_QFW` is enabled. |