Merge tag 'efi-2024-10-rc1-3' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2024-10-rc1-3

Documentation:

* Move out-of-tree building info to HTML
* Enable ReadTheDocs addon management
* Remove FIT documentation that is elsewhere
* Update table of contents for FIT images
* Add description for more boot methods

UEFI:

* Correct finding distro device-path for media devices
* Fix typo in EFI_RT_VOLATILE_STORE description

Other:

* MAINTAINERS: Rename BOOTDEVICE

1 files changed, 29 insertions, 0 deletions

diff --git a/doc/develop/bootstd/extlinux.rst b/doc/develop/bootstd/extlinux.rst
new file mode 100644
index 00000000000..bf27dc57aaa
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+++ b/doc/develop/bootstd/extlinux.rst
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+.. SPDX-License-Identifier: GPL-2.0+:
+
+Extlinux Bootmeth
+=================
+
+`Extlinux <https://uapi-group.org/specifications/specs/boot_loader_specification>`_
+(sometimes called syslinux) allows U-Boot to provide a menu of available
+operating systems from which the user can choose.
+
+U-Boot includes a parser for the `extlinux.conf` file. It consists primarily of
+a list of named operating systems along with the kernel, initial ramdisk and
+other settings. The file is stored in the `extlinux/` subdirectory, possibly
+under the `boot/` subdirectory. This list of prefixes (``{"/", "/boot"}`` by
+default) can be selected with the `filename-prefixes` property in the bootstd
+device.
+
+Note that the :doc:`pxelinux` uses the same file format, but in a
+network context.
+
+When invoked on a bootdev, this bootmeth searches for the file and creates a
+bootflow if found.
+
+When the bootflow is booted, the bootmeth calls ``pxe_setup_ctx()`` to set up
+the context, then ``pxe_process()`` to process the file. Depending on the
+contents, this may boot an operating system or provide a list of options to
+the user, perhaps with a timeout.
+
+The compatible string "u-boot,extlinux" is used for the driver. It is present
+if `CONFIG_BOOTMETH_EXTLINUX` is enabled.