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author | Rasmus Villemoes <rasmus.villemoes@prevas.dk> | 2021-04-21 11:06:54 +0200 |
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committer | Tom Rini <trini@konsulko.com> | 2021-05-04 11:50:50 -0400 |
commit | 95fd9772011f29fad2c40fbc3060b5dac042152c (patch) | |
tree | e06d8d10b7e5cd0b011372786ae918067b982d3e /env/common.c | |
parent | 1cbfed8d3e9254d7e2a9466498ef867f7cb3f4cd (diff) | |
download | u-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 'env/common.c')
-rw-r--r-- | env/common.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/env/common.c b/env/common.c index 49bbb05eec..81e9e0b2aa 100644 --- a/env/common.c +++ b/env/common.c @@ -20,6 +20,7 @@ #include <errno.h> #include <malloc.h> #include <u-boot/crc.h> +#include <dm/ofnode.h> DECLARE_GLOBAL_DATA_PTR; @@ -334,3 +335,32 @@ int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf, return found; } #endif + +#ifdef CONFIG_ENV_IMPORT_FDT +void env_import_fdt(void) +{ + const char *path; + struct ofprop prop; + ofnode node; + int res; + + path = env_get("env_fdt_path"); + if (!path || !path[0]) + return; + + node = ofnode_path(path); + if (!ofnode_valid(node)) { + printf("Warning: device tree node '%s' not found\n", path); + return; + } + + for (res = ofnode_get_first_property(node, &prop); + !res; + res = ofnode_get_next_property(&prop)) { + const char *name, *val; + + val = ofnode_get_property_by_prop(&prop, &name, NULL); + env_set(name, val); + } +} +#endif |