This commit adds the support to overwrite and/or adapt blspec config
files by the following global variables:
- global.blspec.fixup.devicetree
- global.blspec.fixup.initrd
- global.blspec.fixup.options
- global.blspec.fixup.linux
- global.blspec.fixup.devicetree-overlay.
Overwriting blspec-config's shouldn't be the normal case but there are
cases where this support is needed. One use-case can be a special
handling during update. E.g. the normal boot-flow don't need the initrd
but the update-flow uses it because the update system is on the initrd.
Another use-case could be a dynamic devicetree-overlay handling. E.g.
the board code dynamically checks which periphery boards are connected
and adds the required overlays dynamically.
A warning is printed if a already set option is overwritten to identify
unintended wrong boot behaviour early.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
common/blspec.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/common/blspec.c b/common/blspec.c
index a07343f427..b527731a27 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -210,12 +210,21 @@ err_out:
*/
const char *blspec_entry_var_get(struct blspec_entry *entry, const char *name)
{
+ const char *match, *fixup;
const char *str;
int ret;
ret = of_property_read_string(entry->node, name, &str);
- return ret ? NULL : str;
+ /* Check user specific overrides */
+ match = basprintf("global.blspec.fixup.%s", name);
+ fixup = getenv_nonempty(match);
+ free((void *)match);
+
+ if (!ret && fixup)
+ pr_warn("Overwrite %s blspec entry by fixup\n", name);
+
+ return fixup ? fixup : (ret ? NULL : str);
}
static void blspec_entry_free(struct bootentry *be)
--
2.20.1
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