Pass barebox-detected bootsource to Linux to make it availible to
Linux userspace. That information is passed as full path to the node
corresponding to the bootsource and is placed under /chosen/bootsource
and it can be read under Linux in
/sys/firmware/devicetree/base/chosen/bootsource
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
common/oftree.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)
diff --git a/common/oftree.c b/common/oftree.c
index 8a2ede4c6..5ab6bf089 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -11,6 +11,7 @@
#include <getopt.h>
#include <init.h>
#include <boot.h>
+#include <bootsource.h>
#include <i2c/i2c.h>
#define MAX_LEVEL 32 /* how deeply nested we will go */
@@ -114,6 +115,47 @@ void of_print_cmdline(struct device_node *root)
printf("commandline: %s\n", cmdline);
}
+static int of_fixup_bootargs_bootsource(struct device_node *root,
+ struct device_node *chosen)
+{
+ char *alias_name = bootsource_get_alias_name();
+ struct device_node *bootsource;
+ struct device_node *aliasnp;
+ struct property *p;
+ int ret;
+
+ if (!alias_name)
+ return 0;
+
+ bootsource = of_find_node_by_alias(root, alias_name);
+ /*
+ * If kerenel DTB doesn't have the appropriate alias set up,
+ * give up and exit early. No error is reported.
+ */
+ if (!bootsource) {
+ ret = 0;
+ goto exit;
+ }
+
+ aliasnp = of_find_node_by_path_from(root, "/aliases");
+ if (!aliasnp) {
+ ret = -ENOENT;
+ goto exit;
+ }
+
+ p = of_find_property(aliasnp, alias_name, NULL);
+ if (!p) {
+ ret = -ENOENT;
+ goto exit;
+ }
+
+ ret = of_set_property(chosen, "bootsource", of_property_get_value(p),
+ p->length, true);
+exit:
+ free(alias_name);
+ return ret;
+}
+
static int of_fixup_bootargs(struct device_node *root, void *unused)
{
struct device_node *node;
@@ -131,8 +173,10 @@ static int of_fixup_bootargs(struct device_node *root, void *unused)
of_property_write_string(node, "barebox-version", release_string);
err = of_property_write_string(node, "bootargs", str);
+ if (err)
+ return err;
- return err;
+ return of_fixup_bootargs_bootsource(root, node);
}
static int of_register_bootargs_fixup(void)
--
2.17.0
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