[PATCH 03/19] boot: Allow FIT to fall back from best-match option

[Simon Glass]

When the best-match feature fails to find something, use the provided
config name as a fallback. The allows SPL to select a suitable config
when best-match is enabled.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 boot/image-fit.c | 19 ++++++++++---------
 include/image.h  |  4 +++-
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/boot/image-fit.c b/boot/image-fit.c
index 7d56f0b5e6e..439ff51edf6 100644
--- a/boot/image-fit.c
+++ b/boot/image-fit.c
@@ -1729,13 +1729,13 @@ int fit_conf_find_compat(const void *fit, const void *fdt)
 	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
 	if (confs_noffset < 0 || images_noffset < 0) {
 		debug("Can't find configurations or images nodes.\n");
-		return -1;
+		return -EINVAL;
 	}
 
 	fdt_compat = fdt_getprop(fdt, 0, "compatible", &fdt_compat_len);
 	if (!fdt_compat) {
 		debug("Fdt for comparison has no \"compatible\" property.\n");
-		return -1;
+		return -ENXIO;
 	}
 
 	/*
@@ -1812,7 +1812,7 @@ int fit_conf_find_compat(const void *fit, const void *fdt)
 	}
 	if (!best_match_offset) {
 		debug("No match found.\n");
-		return -1;
+		return -ENOENT;
 	}
 
 	return best_match_offset;
@@ -2095,17 +2095,18 @@ int fit_image_load(struct bootm_headers *images, ulong addr,
 		 * fit_conf_get_node() will try to find default config node
 		 */
 		bootstage_mark(bootstage_id + BOOTSTAGE_SUB_NO_UNIT_NAME);
-		if (IS_ENABLED(CONFIG_FIT_BEST_MATCH) && !fit_uname_config) {
-			cfg_noffset = fit_conf_find_compat(fit, gd_fdt_blob());
-		} else {
-			cfg_noffset = fit_conf_get_node(fit, fit_uname_config);
-		}
-		if (cfg_noffset < 0) {
+		ret = -ENXIO;
+		if (IS_ENABLED(CONFIG_FIT_BEST_MATCH) && !fit_uname_config)
+			ret = fit_conf_find_compat(fit, gd_fdt_blob());
+		if (ret < 0 && ret != -EINVAL)
+			ret = fit_conf_get_node(fit, fit_uname_config);
+		if (ret < 0) {
 			puts("Could not find configuration node\n");
 			bootstage_error(bootstage_id +
 					BOOTSTAGE_SUB_NO_UNIT_NAME);
 			return -ENOENT;
 		}
+		cfg_noffset = ret;
 
 		fit_base_uname_config = fdt_get_name(fit, cfg_noffset, NULL);
 		printf("   Using '%s' configuration\n", fit_base_uname_config);
diff --git a/include/image.h b/include/image.h
index dbf8d0e7ba9..92128180e0f 100644
--- a/include/image.h
+++ b/include/image.h
@@ -1423,7 +1423,9 @@ int fit_check_format(const void *fit, ulong size);
  * copied into the configuration node in the FIT image. This is required to
  * match configurations with compressed FDTs.
  *
- * Returns: offset to the configuration to use if one was found, -1 otherwise
+ * Returns: offset to the configuration to use if one was found, -EINVAL if
+ * there a /configurations or /images node is missing, -ENOENT if no match was
+ * found, -ENXIO if the FDT node has no compatible string
  */
 int fit_conf_find_compat(const void *fit, const void *fdt);
 
-- 
2.34.1