修改 ah fw 在fw img 之后读取附加的oem数据

inc/pib/iot_oem.h

@@ -48,6 +48,11 @@ extern "C" {
 
 #define IOT_OEM_SECTION_SEC_ADDR        (3072)
 
+#define IOT_OEM_EXT_SECTION_OFFSET(fw_size) \
+    (((fw_size+31)&(~0x1f))+IOT_OEM_SECTION_START_ADDR)
+
+#define IOT_OEM_EXT_MAGIC_STR           "_oem_ext"
+
 #define IOT_OEM_DUMMY_LEN               106
 /* use simple pair passcode for security check */
 #define IOT_OEM_SEC_TYPE_PASSCODE       1
@@ -219,6 +224,14 @@ extern const uint8_t g_iot_sec_root_sm2_pub_v1[IOT_SEC_ROOT_SM2_PUB_LEN];
  */
 uint32_t iot_oem_read_mtd(uint8_t *buf, uint32_t size, uint32_t offset);
 
+/**
+ * @brief iot_oem_read_mtd_ext() - read oem ext data from flash fw section.
+ * @param buf: pointer to receive oem data.
+ * @param size: length to receive oem data.
+ * @retval 0 success; others fail.
+ */
+uint32_t iot_oem_read_mtd_ext(uint8_t *buf, uint32_t size);
+
 /**
  * @brief iot_oem_init - init oem function.
  *                       warning, iot_oem_init should be called after pib load