添加oem解析相关 注释

pib/src/iot_oem.c

@@ -107,6 +107,42 @@ uint32_t iot_oem_read_mtd(uint8_t *buf, uint32_t size, uint32_t offset)
     return ret;
 }
 
+
+
+// 抓取额外的差分oem数据
+uint32_t iot_oem_read_mtd_ext(uint8_t *buff,size_t buff_size)
+{
+    int fd;
+    int ret;
+    int offset;
+    int status;
+    int fw_prtition=PART_NUM_FW1;
+    do {
+        fd = dev_open(fw_prtition, 0);
+        if (fd < 0) {
+            fd = 0;
+            break;
+        }
+        status = dev_seek(fd, offset, DEV_SEEK_SET);
+        if (status < 0) {
+            break;
+        }
+        status = dev_read(fd, buff, buff_size);
+        if (status < 0) {
+            break;
+        }
+        ret = ERR_OK;
+    } while(0);
+    if (fd) {
+        dev_close(fd);
+    }
+    return ret;
+
+}
+
+
+
+
 static uint32_t iot_oem_write_mtd(uint8_t *buf, uint32_t size, uint32_t offset)
 {
     uint32_t ret = ERR_FAIL;
@@ -230,6 +266,7 @@ uint32_t iot_oem_get_cfg_ext(iot_oem_obj_t** oem_obj)
 #endif
 
     if (gbl_oemcfg.ready != 1) {
+        // 这里只是读取基础oem配置 没有读取差分配置
         ret = iot_oem_read_mtd((uint8_t*)&gbl_oemcfg.oemcfg, sizeof(iot_oem_cfg_t),
             IOT_OEM_SECTION_START_ADDR);