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https://github.com/AsahiLinux/u-boot
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doc: Move distro boot doc to rST
Move this over to the new rST format. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Artem Lapkin <email2tema@gmail.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Simon Glass
Tom Rini
parent
81a2f8d34b
commit
37c5195dfc
2 changed files with 79 additions and 97 deletions
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@ -1,9 +1,4 @@
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SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2014 Red Hat Inc.
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* Copyright (c) 2014-2015, NVIDIA CORPORATION. All rights reserved.
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* Copyright (C) 2015 K. Merker <merker@debian.org>
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*/
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.. SPDX-License-Identifier: GPL-2.0+
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Generic Distro Configuration Concept
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====================================
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@ -73,9 +68,8 @@ Boot Configuration Files
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The standard format for boot configuration files is that of extlinux.conf, as
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handled by U-Boot's "syslinux" (disk) or "pxe boot" (network). This is roughly
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as specified at:
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as specified at BootLoaderSpec_:
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http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/
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... with the exceptions that the BootLoaderSpec document:
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@ -87,73 +81,70 @@ http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/
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* Does not document the fdtdir option, which automatically selects the DTB to
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pass to the kernel.
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One example extlinux.conf generated by the Fedora installer is:
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One example extlinux.conf generated by the Fedora installer is::
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------------------------------------------------------------
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# extlinux.conf generated by anaconda
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# extlinux.conf generated by anaconda
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ui menu.c32
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ui menu.c32
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menu autoboot Welcome to Fedora. Automatic boot in # second{,s}. Press a key for options.
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menu title Fedora Boot Options.
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menu hidden
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menu autoboot Welcome to Fedora. Automatic boot in # second{,s}. Press a key for options.
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menu title Fedora Boot Options.
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menu hidden
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timeout 50
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#totaltimeout 9000
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timeout 50
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#totaltimeout 9000
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default Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae) 22 (Rawhide)
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default Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae) 22 (Rawhide)
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label Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl) 22 (Rawhide)
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kernel /boot/vmlinuz-3.17.0-0.rc4.git2.1.fc22.armv7hl
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8 LANG=en_US.UTF-8 drm.debug=0xf
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fdtdir /boot/dtb-3.17.0-0.rc4.git2.1.fc22.armv7hl
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initrd /boot/initramfs-3.17.0-0.rc4.git2.1.fc22.armv7hl.img
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label Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl) 22 (Rawhide)
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kernel /boot/vmlinuz-3.17.0-0.rc4.git2.1.fc22.armv7hl
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8 LANG=en_US.UTF-8 drm.debug=0xf
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fdtdir /boot/dtb-3.17.0-0.rc4.git2.1.fc22.armv7hl
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initrd /boot/initramfs-3.17.0-0.rc4.git2.1.fc22.armv7hl.img
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label Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae) 22 (Rawhide)
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kernel /boot/vmlinuz-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8 LANG=en_US.UTF-8 drm.debug=0xf
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fdtdir /boot/dtb-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae
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initrd /boot/initramfs-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae.img
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label Fedora (3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae) 22 (Rawhide)
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kernel /boot/vmlinuz-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8 LANG=en_US.UTF-8 drm.debug=0xf
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fdtdir /boot/dtb-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae
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initrd /boot/initramfs-3.17.0-0.rc4.git2.1.fc22.armv7hl+lpae.img
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label Fedora-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc (0-rescue-8f6ba7b039524e0eb957d2c9203f04bc)
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kernel /boot/vmlinuz-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc
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initrd /boot/initramfs-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc.img
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8
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fdtdir /boot/dtb-3.16.0-0.rc6.git1.1.fc22.armv7hl+lpae
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------------------------------------------------------------
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label Fedora-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc (0-rescue-8f6ba7b039524e0eb957d2c9203f04bc)
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kernel /boot/vmlinuz-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc
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initrd /boot/initramfs-0-rescue-8f6ba7b039524e0eb957d2c9203f04bc.img
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append ro root=UUID=8eac677f-8ea8-4270-8479-d5ddbb797450 console=ttyS0,115200n8
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fdtdir /boot/dtb-3.16.0-0.rc6.git1.1.fc22.armv7hl+lpae
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Another hand-crafted network boot configuration file is:
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------------------------------------------------------------
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TIMEOUT 100
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Another hand-crafted network boot configuration file is::
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MENU TITLE TFTP boot options
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TIMEOUT 100
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LABEL jetson-tk1-emmc
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MENU LABEL ../zImage root on Jetson TK1 eMMC
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=80a5a8e9-c744-491a-93c1-4f4194fd690b
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MENU TITLE TFTP boot options
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LABEL venice2-emmc
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MENU LABEL ../zImage root on Venice2 eMMC
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=5f71e06f-be08-48ed-b1ef-ee4800cc860f
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LABEL jetson-tk1-emmc
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MENU LABEL ../zImage root on Jetson TK1 eMMC
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=80a5a8e9-c744-491a-93c1-4f4194fd690b
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LABEL sdcard
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MENU LABEL ../zImage, root on 2GB sdcard
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=b2f82cda-2535-4779-b467-094a210fbae7
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LABEL venice2-emmc
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MENU LABEL ../zImage root on Venice2 eMMC
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=5f71e06f-be08-48ed-b1ef-ee4800cc860f
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LABEL fedora-installer-fk
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MENU LABEL Fedora installer w/ Fedora kernel
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LINUX fedora-installer/vmlinuz
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INITRD fedora-installer/initrd.img.orig
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FDTDIR fedora-installer/dtb
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APPEND loglevel=8 ip=dhcp inst.repo=http://10.0.0.2/mirrors/fedora/linux/development/rawhide/armhfp/os/ rd.shell cma=64M
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------------------------------------------------------------
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LABEL sdcard
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MENU LABEL ../zImage, root on 2GB sdcard
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LINUX ../zImage
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FDTDIR ../
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APPEND console=ttyS0,115200n8 console=tty1 loglevel=8 rootwait rw earlyprintk root=PARTUUID=b2f82cda-2535-4779-b467-094a210fbae7
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LABEL fedora-installer-fk
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MENU LABEL Fedora installer w/ Fedora kernel
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LINUX fedora-installer/vmlinuz
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INITRD fedora-installer/initrd.img.orig
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FDTDIR fedora-installer/dtb
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APPEND loglevel=8 ip=dhcp inst.repo=http://10.0.0.2/mirrors/fedora/linux/development/rawhide/armhfp/os/ rd.shell cma=64M
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U-Boot Implementation
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=====================
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@ -166,13 +157,11 @@ a line with "CONFIG_DISTRO_DEFAULTS=y". If you want to enable this
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from Kconfig itself, for e.g. all boards using a specific SoC then
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add a "imply DISTRO_DEFAULTS" to your SoC CONFIG option.
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In your board configuration file, include the following:
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In your board configuration file, include the following::
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------------------------------------------------------------
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#ifndef CONFIG_SPL_BUILD
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#include <config_distro_bootcmd.h>
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#endif
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------------------------------------------------------------
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#ifndef CONFIG_SPL_BUILD
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#include <config_distro_bootcmd.h>
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#endif
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The first of those headers primarily enables a core set of U-Boot features,
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such as support for MBR and GPT partitions, ext* and FAT filesystems, booting
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@ -205,7 +194,6 @@ CONFIG_EXTRA_ENV_SETTINGS in the board's U-Boot configuration file, so that
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the user doesn't have to configure them.
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fdt_addr:
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Mandatory for any system that provides the DTB in HW (e.g. ROM) and wishes
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to pass that DTB to Linux, rather than loading a DTB from the boot
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filesystem. Prohibited for any other system.
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@ -214,7 +202,6 @@ fdt_addr:
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address.
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fdt_addr_r:
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Mandatory. The location in RAM where the DTB will be loaded or copied to when
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processing the fdtdir/devicetreedir or fdt/devicetree options in
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extlinux.conf.
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@ -225,7 +212,6 @@ fdt_addr_r:
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A size of 1MB for the FDT/DTB seems reasonable.
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fdtfile:
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Mandatory. the name of the DTB file for the specific board for instance
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the espressobin v5 board the value is "marvell/armada-3720-espressobin.dtb"
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while on a clearfog pro it is "armada-388-clearfog-pro.dtb" in the case of
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@ -236,16 +222,14 @@ fdtfile:
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SoC vendor directories.
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ramdisk_addr_r:
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Mandatory. The location in RAM where the initial ramdisk will be loaded to
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when processing the initrd option in extlinux.conf.
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It is recommended that this location be highest in RAM out of fdt_addr_,
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It is recommended that this location be highest in RAM out of fdt_addr_r,
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kernel_addr_r, and ramdisk_addr_r, so that the RAM disk can vary in size
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and use any available RAM.
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kernel_addr_r:
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Mandatory. The location in RAM where the kernel will be loaded to when
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processing the kernel option in the extlinux.conf.
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@ -270,14 +254,12 @@ kernel_comp_size:
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size has to at least the size of loaded image for decompression to succeed.
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pxefile_addr_r:
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Mandatory. The location in RAM where extlinux.conf will be loaded to prior
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to processing.
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A size of 1MB for extlinux.conf is more than adequate.
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scriptaddr:
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Mandatory, if the boot script is boot.scr rather than extlinux.conf. The
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location in RAM where boot.scr will be loaded to prior to execution.
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@ -292,24 +274,22 @@ MEM_LAYOUT_ENV_SETTINGS in include/configs/tegra124-common.h.
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Boot Target Configuration
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-------------------------
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<config_distro_bootcmd.h> defines $bootcmd and many helper command variables
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that automatically search attached disks for boot configuration files and
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execute them. Boards must provide configure <config_distro_bootcmd.h> so that
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it supports the correct set of possible boot device types. To provide this
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The `config_distro_bootcmd.h` file defines $bootcmd and many helper command
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variables that automatically search attached disks for boot configuration files
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and execute them. Boards must provide configure <config_distro_bootcmd.h> so
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that it supports the correct set of possible boot device types. To provide this
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configuration, simply define macro BOOT_TARGET_DEVICES prior to including
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<config_distro_bootcmd.h>. For example:
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<config_distro_bootcmd.h>. For example::
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------------------------------------------------------------
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#ifndef CONFIG_SPL_BUILD
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#define BOOT_TARGET_DEVICES(func) \
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func(MMC, mmc, 1) \
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func(MMC, mmc, 0) \
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func(USB, usb, 0) \
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func(PXE, pxe, na) \
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func(DHCP, dhcp, na)
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#include <config_distro_bootcmd.h>
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#endif
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------------------------------------------------------------
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#ifndef CONFIG_SPL_BUILD
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#define BOOT_TARGET_DEVICES(func) \
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func(MMC, mmc, 1) \
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func(MMC, mmc, 0) \
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func(USB, usb, 0) \
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func(PXE, pxe, na) \
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func(DHCP, dhcp, na)
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#include <config_distro_bootcmd.h>
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#endif
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Each entry in the macro defines a single boot device (e.g. a specific eMMC
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device or SD card) or type of boot device (e.g. USB disk). The parameters to
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@ -328,7 +308,6 @@ up by <config_distro_bootcmd.h>. After this, various environment variables may
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be altered to influence the boot process:
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boot_targets:
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The list of boot locations searched.
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Example: mmc0, mmc1, usb, pxe
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@ -336,7 +315,6 @@ boot_targets:
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Entries may be removed or re-ordered in this list to affect the boot order.
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boot_prefixes:
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For disk-based booting, the list of directories within a partition that are
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searched for boot configuration files (extlinux.conf, boot.scr).
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@ -346,7 +324,6 @@ boot_prefixes:
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directories which are searched.
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boot_scripts:
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The name of U-Boot style boot.scr files that $bootcmd searches for.
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Example: boot.scr.uimg boot.scr
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@ -358,17 +335,14 @@ boot_scripts:
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filenames which are supported.
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scan_dev_for_extlinux:
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If you want to disable extlinux.conf on all disks, set the value to something
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innocuous, e.g. setenv scan_dev_for_extlinux true.
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scan_dev_for_scripts:
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If you want to disable boot.scr on all disks, set the value to something
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innocuous, e.g. setenv scan_dev_for_scripts true.
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boot_net_usb_start:
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If you want to prevent USB enumeration by distro boot commands which execute
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network operations, set the value to something innocuous, e.g. setenv
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boot_net_usb_start true. This would be useful if you know your Ethernet
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@ -376,7 +350,6 @@ boot_net_usb_start:
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avoiding unnecessary actions.
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boot_net_pci_enum:
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If you want to prevent PCI enumeration by distro boot commands which execute
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network operations, set the value to something innocuous, e.g. setenv
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boot_net_pci_enum true. This would be useful if you know your Ethernet
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@ -412,10 +385,12 @@ Examples:
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The list of possible targets consists of:
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- network targets
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* dhcp
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* pxe
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- storage targets (to which a device number must be appended)
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* mmc
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* sata
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* scsi
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@ -428,3 +403,9 @@ of the boot environment and are not guaranteed to exist or work in the same
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way in future u-boot versions. In particular the <device type>_boot
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variables (e.g. mmc_boot, usb_boot) are a strictly internal implementation
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detail and must not be used as a public interface.
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.. _BootLoaderSpec: http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/
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.. sectionauthor:: (C) Copyright 2014 Red Hat Inc.
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.. sectionauthor:: Copyright (c) 2014-2015, NVIDIA CORPORATION. All rights reserved.
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.. sectionauthor:: Copyright (C) 2015 K. Merker <merker@debian.org>
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@ -14,6 +14,7 @@ Implementation
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commands
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config_binding
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devicetree/index
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distro
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driver-model/index
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global_data
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logging
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