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authorRasmus Villemoes <rasmus.villemoes@prevas.dk>2021-04-21 11:06:54 +0200
committerTom Rini <trini@konsulko.com>2021-05-04 11:50:50 -0400
commit95fd9772011f29fad2c40fbc3060b5dac042152c (patch)
treee06d8d10b7e5cd0b011372786ae918067b982d3e /include/env_default.h
parent1cbfed8d3e9254d7e2a9466498ef867f7cb3f4cd (diff)
downloadu-boot-95fd9772011f29fad2c40fbc3060b5dac042152c.tar.gz
env: allow environment to be amended from control dtb
It can be useful to use the same U-Boot binary for multiple purposes, say the normal one, one for developers that allow breaking into the U-Boot shell, and one for use during bootstrapping which runs a special-purpose bootcmd. Or one can have several board variants that can share almost all boot logic, but just needs a few tweaks in the variables used by the boot script. To that end, allow the control dtb to contain a /config/enviroment node (or whatever one puts in fdt_env_path variable), whose property/value pairs are used to update the run-time environment after it has been loaded from its persistent location. The indirection via fdt_env_path is for maximum flexibility - for example, should the user wish (or board logic dictate) that the values in the DTB should no longer be applied, one simply needs to delete the fdt_env_path variable; that can even be done automatically by including a fdt_env_path = ""; property in the DTB node. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Diffstat (limited to 'include/env_default.h')
-rw-r--r--include/env_default.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/env_default.h b/include/env_default.h
index ea31a8eddf..1ddd64ba8f 100644
--- a/include/env_default.h
+++ b/include/env_default.h
@@ -103,6 +103,9 @@ const uchar default_environment[] = {
#ifdef CONFIG_SYS_SOC
"soc=" CONFIG_SYS_SOC "\0"
#endif
+#ifdef CONFIG_ENV_IMPORT_FDT
+ "env_fdt_path=" CONFIG_ENV_FDT_PATH "\0"
+#endif
#endif
#if defined(CONFIG_BOOTCOUNT_BOOTLIMIT) && (CONFIG_BOOTCOUNT_BOOTLIMIT > 0)
"bootlimit=" __stringify(CONFIG_BOOTCOUNT_BOOTLIMIT)"\0"