fdt: Check for a token to skip auto-hash validation

Allow the itb file to declare to u-boot that its hash should not be
checked automatically on bootm or iminfo.  This allows an image to
either be checked automatically or to include a script which may
check it otherwise (such as after part of the itb has been relocated
to RAM by the script).

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

common/image.c

@@ -2496,6 +2496,36 @@ int fit_image_hash_get_value(const void *fit, int noffset, uint8_t **value,
 	return 0;
 }
 
+#ifndef USE_HOSTCC
+/**
+ * fit_image_hash_get_ignore - get hash ignore flag
+ * @fit: pointer to the FIT format image header
+ * @noffset: hash node offset
+ * @ignore: pointer to an int, will hold hash ignore flag
+ *
+ * fit_image_hash_get_ignore() finds hash ignore property in a given hash node.
+ * If the property is found and non-zero, the hash algorithm is not verified by
+ * u-boot automatically.
+ *
+ * returns:
+ *     0, on ignore not found
+ *     value, on ignore found
+ */
+int fit_image_hash_get_ignore(const void *fit, int noffset, int *ignore)
+{
+	int len;
+	int *value;
+
+	value = (int *)fdt_getprop(fit, noffset, FIT_IGNORE_PROP, &len);
+	if (value == NULL || len != sizeof(int))
+		*ignore = 0;
+	else
+		*ignore = *value;
+
+	return 0;
+}
+#endif
+
 /**
  * fit_set_timestamp - set node timestamp property
  * @fit: pointer to the FIT format image header
@@ -2759,6 +2789,9 @@ int fit_image_check_hashes(const void *fit, int image_noffset)
 	char		*algo;
 	uint8_t		*fit_value;
 	int		fit_value_len;
+#ifndef USE_HOSTCC
+	int		ignore;
+#endif
 	uint8_t		value[FIT_MAX_HASH_LEN];
 	int		value_len;
 	int		noffset;
@@ -2795,6 +2828,14 @@ int fit_image_check_hashes(const void *fit, int image_noffset)
 			}
 			printf("%s", algo);
 
+#ifndef USE_HOSTCC
+			fit_image_hash_get_ignore(fit, noffset, &ignore);
+			if (ignore) {
+				printf("-skipped ");
+				continue;
+			}
+#endif
+
 			if (fit_image_hash_get_value(fit, noffset, &fit_value,
 							&fit_value_len)) {
 				err_msg = " error!\nCan't get hash value "

include/image.h

@@ -511,6 +511,7 @@ static inline int image_check_target_arch(const image_header_t *hdr)
 #define FIT_HASH_NODENAME	"hash"
 #define FIT_ALGO_PROP		"algo"
 #define FIT_VALUE_PROP		"value"
+#define FIT_IGNORE_PROP		"uboot-ignore"
 
 /* image node */
 #define FIT_DATA_PROP		"data"
@@ -595,6 +596,9 @@ int fit_image_get_data(const void *fit, int noffset,
 int fit_image_hash_get_algo(const void *fit, int noffset, char **algo);
 int fit_image_hash_get_value(const void *fit, int noffset, uint8_t **value,
 				int *value_len);
+#ifndef USE_HOSTCC
+int fit_image_hash_get_ignore(const void *fit, int noffset, int *ignore);
+#endif
 
 int fit_set_timestamp(void *fit, int noffset, time_t timestamp);
 int fit_set_hashes(void *fit);