Merge pull request #118 from Icenowy/spl-sematic-versioning

FEL: introduce semantic versioning for SPL header

fel.c

@@ -947,8 +947,13 @@ void aw_fel_process_spl_and_uboot(feldev_handle *dev, const char *filename)
  * the result is "true".
  */
 #define SPL_SIGNATURE			"SPL" /* marks "sunxi" header */
-#define SPL_MIN_VERSION			1 /* minimum required version */
-#define SPL_MAX_VERSION			2 /* maximum supported version */
+#define SPL_MAJOR_BITS			3
+#define SPL_MINOR_BITS			5
+#define SPL_VERSION(maj, min)		\
+	((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
+	((min) & ((1U << SPL_MINOR_BITS) - 1)))
+#define SPL_MIN_VERSION			SPL_VERSION(0, 1)
+#define SPL_MAX_VERSION			SPL_VERSION(0, 31)
 bool have_sunxi_spl(feldev_handle *dev, uint32_t spl_addr)
 {
 	uint8_t spl_signature[4];