diff options
| author | Simon Glass <[email protected]> | 2023-09-14 10:55:55 -0600 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2023-09-19 11:36:26 -0400 |
| commit | 3b58de4d0b6bde8f8dab0fa0c0dc417e57b6c804 (patch) | |
| tree | be5d9cdd4a91bfd82aac6ee890f8f30165932fd2 /doc/develop | |
| parent | 064a57d019781906e32ccaa16ce122e254dc6533 (diff) | |
Mark DISTRO_DEFAULTS as deprecated
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 <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Diffstat (limited to 'doc/develop')
| -rw-r--r-- | doc/develop/bootstd.rst | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/doc/develop/bootstd.rst b/doc/develop/bootstd.rst index e8b90752f08..6172dc906bd 100644 --- a/doc/develop/bootstd.rst +++ b/doc/develop/bootstd.rst @@ -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/[email protected]/ |