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.. SPDX-License-Identifier: GPL-2.0+: PXE Bootmeth ============ PXE (Preboot eXecution-Environment) provides a way to boot an operating system over a network interface. The PXE bootmeth supports PXELINUX and allows U-Boot to provide a menu of possible Operating Systems from which the user can choose. U-Boot includes a parser for the `extlinux.conf` file described `here <https://uapi-group.org/specifications/specs/boot_loader_specification>`_. It consists primarily of a list of named operating systems along with the kernel, initial ramdisk and other settings. The file is retrieved from a network server using the TFTP protocol. When invoked on a bootdev, this bootmeth searches for the file and creates a bootflow if found. See `PXELINUX <https://wiki.syslinux.org/wiki/index.php?title=PXELINUX>`_ for a full description of the search procedure. 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-pxe" is used for the driver. It is present if `CONFIG_BOOTMETH_EXTLINUX_PXE` is enabled. |