diff --git a/common/fb_mmc.c b/common/fb_mmc.c
index 4fdafabe53..e083daa0e4 100755
--- a/common/fb_mmc.c
+++ b/common/fb_mmc.c
@@ -459,3 +459,19 @@ void fb_mmc_erase(const char *cmd, char *response)
 	       blks_size * info.blksz, cmd);
 	fastboot_okay("", response);
 }
+
+lbaint_t fb_mmc_get_erase_grp_size(void)
+{
+	lbaint_t grp_size;
+
+	struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
+
+	if (!mmc) {
+		pr_err("invalid mmc device");
+		return -1;
+	}
+
+	grp_size = mmc->erase_grp_size << 9;
+
+	return  grp_size;
+}
diff --git a/include/fb_mmc.h b/include/fb_mmc.h
index 402ba9b1b4..8df6593686 100644
--- a/include/fb_mmc.h
+++ b/include/fb_mmc.h
@@ -4,6 +4,12 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
+#ifndef _FB_MMC_H_
+#define _FB_MMC_H_
 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 			unsigned int download_bytes, char *response);
 void fb_mmc_erase(const char *cmd, char *response);
+
+lbaint_t fb_mmc_get_erase_grp_size(void);
+
+#endif