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authorSascha Hauer <s.hauer@pengutronix.de>2014-03-21 08:43:00 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2014-03-24 07:58:33 +0100
commit6979118edef2b57c3bb6f401b58a03ab6bb5a54e (patch)
tree0a0986ccdf06bd43cc7e733343d1b372b4107b7b /common/blspec.c
parent09b884bdec3dd4cb4bac8a6f6e777eedf33c82f3 (diff)
downloadbarebox-6979118edef2b57c3bb6f401b58a03ab6bb5a54e.tar.gz
blspec: Check if an entry is compatible with the current machine
When a bootspec entry has the 'devicetree' property specified, check if the tree is compatible with the currently running machine, otherwise ignore the entry. This makes it possible to have entries for multiple machines on an SD card and pick a suitable one. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/blspec.c')
-rw-r--r--common/blspec.c81
1 files changed, 79 insertions, 2 deletions
diff --git a/common/blspec.c b/common/blspec.c
index 9b4b096..f165b77 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -235,6 +235,78 @@ out:
}
/*
+ * entry_is_of_compatible - check if a bootspec entry is compatible with
+ * the current machine.
+ *
+ * returns true is the entry is compatible, false otherwise
+ */
+static bool entry_is_of_compatible(struct blspec_entry *entry)
+{
+ const char *devicetree;
+ const char *abspath;
+ size_t size;
+ void *fdt = NULL;
+ int ret;
+ struct device_node *root = NULL, *barebox_root;
+ const char *compat;
+ char *filename;
+
+ /* If we don't have a root node every entry is compatible */
+ barebox_root = of_get_root_node();
+ if (!barebox_root)
+ return true;
+
+ ret = of_property_read_string(barebox_root, "compatible", &compat);
+ if (ret)
+ return false;
+
+ if (entry->rootpath)
+ abspath = entry->rootpath;
+ else
+ abspath = "";
+
+ /* If the entry doesn't specifiy a devicetree we are compatible */
+ devicetree = blspec_entry_var_get(entry, "devicetree");
+ if (!devicetree)
+ return true;
+
+ if (!strcmp(devicetree, "none"))
+ return true;
+
+ filename = asprintf("%s/%s", abspath, devicetree);
+
+ fdt = read_file(filename, &size);
+ if (!fdt) {
+ ret = false;
+ goto out;
+ }
+
+ root = of_unflatten_dtb(NULL, fdt);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ goto out;
+ }
+
+ if (of_device_is_compatible(root, compat)) {
+ ret = true;
+ goto out;
+ }
+
+ pr_info("ignoring entry with incompatible devicetree \"%s\"\n",
+ (char *)of_get_property(root, "compatible", &size));
+
+ ret = false;
+
+out:
+ if (root)
+ of_delete_node(root);
+ free(filename);
+ free(fdt);
+
+ return ret;
+}
+
+/*
* blspec_scan_directory - scan over a directory
*
* Given a root path collects all blspec entries found under /blspec/entries/.
@@ -313,12 +385,17 @@ int blspec_scan_directory(struct blspec *blspec, const char *root)
continue;
}
- found++;
-
entry->rootpath = xstrdup(root);
entry->configpath = configname;
entry->cdev = get_cdev_by_mountpath(root);
+ if (!entry_is_of_compatible(entry)) {
+ blspec_entry_free(entry);
+ continue;
+ }
+
+ found++;
+
name = asprintf("%s/%s", dirname, d->d_name);
if (entry_default && !strcmp(name, entry_default))
entry->boot_default = true;