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Mark DISTRO_DEFAULTS as deprecated

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Standard boot has been in place for a while now. Quite a few problems
have been found and fixed. It seems like a good time to mark the
script-based approach as deprecated and encourage people to use standard
boot.

Update the DISTRO_DEFAULTS Kconfig to encourage people to move to
standard boot, which is able to boot Linux distributions automatically.

Add a short migration guide to make this easier.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Simon Glass 2023-09-14 10:55:55 -06:00 committed by Tom Rini
parent 064a57d019
commit 3b58de4d0b
2 changed files with 28 additions and 1 deletions
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6
boot/Kconfig
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@ -784,7 +784,7 @@ config SYS_BOOT_RAMDISK_HIGH
endmenu # Boot images
config DISTRO_DEFAULTS
bool "Select defaults suitable for booting general purpose Linux distributions"
bool "(deprecated) Script-based booting of Linux distributions"
select BOOT_DEFAULTS
select AUTO_COMPLETE
select CMDLINE_EDITING
@ -792,6 +792,10 @@ config DISTRO_DEFAULTS
select HUSH_PARSER
select SYS_LONGHELP
help
Note: These scripts have been replaced by Standard Boot. Do not use
them on new boards. See 'Migrating from distro_boot' at
doc/develop/bootstd.rst
Select this to enable various options and commands which are suitable
for building u-boot for booting general purpose Linux distributions.

23
doc/develop/bootstd.rst
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@ -464,6 +464,28 @@ ready File was loaded and is ready for use. In this state the bootflow is
======= =======================================================================
Migrating from distro_boot
--------------------------
To migrate from distro_boot:
#. Update your board header files to remove the BOOTENV and BOOT_TARGET_xxx
defines. Standard boot finds available boot devices automatically.
#. Remove the "boot_targets" variable unless you need it. Standard boot uses a
default order from fastest to slowest, which generally matches the order used
by boards.
#. Make sure that CONFIG_BOOTSTD_DEFAULTS is enabled by your board, so it can
boot common Linux distributions.
An example patch is at migrate_patch_.
If you are using custom boot scripts for your board, consider creating your
own bootmeth to hold the logic. There are various examples at
`boot/bootmeth_...`.
Theory of operation
-------------------
@ -775,3 +797,4 @@ Other ideas:
.. _BootLoaderSpec: http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/
.. _distro_boot: https://github.com/u-boot/u-boot/blob/master/boot/distro.c
.. _bootflow_h: https://github.com/u-boot/u-boot/blob/master/include/bootflow.h
.. _migrate_patch: https://patchwork.ozlabs.org/project/uboot/patch/20230727215433.578830-2-sjg@chromium.org/