Index: libzyutil-1.0/flash.c
===================================================================
--- libzyutil-1.0.orig/flash.c	2016-08-17 15:24:30.277089115 +0800
+++ libzyutil-1.0/flash.c	2016-08-18 10:35:48.189894481 +0800
@@ -115,6 +115,27 @@
 	return ret;
 }
 
+unsigned int zyUtilMtdDevGetSize(char *devName)
+{
+	int devFd = -1;
+	struct mtd_info_user mtd;
+
+	/* Open MTD device */
+	if((devFd = zyUtilOpen(devName, O_SYNC | O_RDWR)) == -1) {
+		printf("Cannot open MTD device!\n");
+		return ZCFG_INTERNAL_ERROR;
+	}
+
+	/* get some info about the flash device */
+	if(ioctl(devFd, MEMGETINFO, &mtd) < 0) {
+        printf("This doesn't seem to be a valid MTD flash device!\n");
+		close(devFd);
+		return ZCFG_INTERNAL_ERROR;
+	}
+	close(devFd);
+	return mtd.size;
+}
+
 zcfgRet_t zyUtilWriteBufToFlash(char *devName, void *buf, uint32_t buf_size)
 {
 	int devFd = -1, i = 0;
Index: libzyutil-1.0/zyutil.h
===================================================================
--- libzyutil-1.0.orig/zyutil.h	2016-08-17 15:24:30.457089115 +0800
+++ libzyutil-1.0/zyutil.h	2016-08-17 20:26:22.348742224 +0800
@@ -24,6 +24,7 @@
 
 /*Flash*/
 zcfgRet_t zyUtilMtdDevGetByName(char *mtdname, char *mtddev);
+unsigned int zyUtilMtdDevGetSize(char *devName);
 zcfgRet_t zyUtilWriteBufToFlash(char *devName, void *buf, uint32_t buf_size);
 int zyUtilReadBufFromFlash(char *devName, void *buf, uint32_t buf_size);
 #if 1 //#ifdef ZYXEL_WWAN