diff --git a/common/aboot.c b/common/aboot.c
index 2775254c742e..5f5fb6b62bfa 100644
--- a/common/aboot.c
+++ b/common/aboot.c
@@ -257,9 +257,9 @@ static void sparse_put_data_buffer(sparse_buffer_t *buffer)
 	free(buffer);
 }
 
-void write_sparse_image(block_dev_desc_t *dev_desc,
-		disk_partition_t *info, const char *part_name,
-		void *data, unsigned sz)
+int write_sparse_image(block_dev_desc_t *dev_desc,
+		       disk_partition_t *info, const char *part_name,
+		       void *data, unsigned sz)
 {
 	lbaint_t start;
 	lbaint_t blkcnt;
@@ -273,8 +273,8 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 
 	sparse_header = sparse_parse_header(&data);
 	if (!sparse_header) {
-		fastboot_fail("sparse header issue\n");
-		return;
+		printf("sparse header issue\n");
+		return -EINVAL;
 	}
 
 	/*
@@ -285,8 +285,7 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 	if (offset) {
 		printf("%s: Sparse image block size issue [%u]\n",
 		       __func__, sparse_header->blk_sz);
-		fastboot_fail("sparse image block size issue");
-		return;
+		return -EINVAL;
 	}
 
 	puts("Flashing Sparse Image\n");
@@ -296,8 +295,8 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 	for (chunk = 0; chunk < sparse_header->total_chunks; chunk++) {
 		chunk_header = sparse_parse_chunk(sparse_header, &data);
 		if (!chunk_header) {
-			fastboot_fail("Unknown chunk type");
-			return;
+			printf("Unknown chunk type");
+			return -EINVAL;
 		}
 
 		/*
@@ -321,8 +320,7 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 		    (info->start + info->size)) {
 			printf("%s: Request would exceed partition size!\n",
 			       __func__);
-			fastboot_fail("Request would exceed partition size!");
-			return;
+			return -EINVAL;
 		}
 
 		for (i = 0; i < buffer->repeat; i++) {
@@ -337,8 +335,7 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 			if (buffer_blks != buffer_blk_cnt) {
 				printf("%s: Write %d failed " LBAFU "\n",
 				       __func__, i, buffer_blks);
-				fastboot_fail("flash write failure");
-				return;
+				return -EIO;
 			}
 
 			total_blocks += buffer_blk_cnt;
@@ -351,9 +348,10 @@ void write_sparse_image(block_dev_desc_t *dev_desc,
 	      total_blocks, skipped, sparse_header->total_blks);
 	printf("........ wrote %d blocks to '%s'\n", total_blocks, part_name);
 
-	if (total_blocks != sparse_header->total_blks)
-		fastboot_fail("sparse image write failure");
+	if (total_blocks != sparse_header->total_blks) {
+		printf("sparse image write failure\n");
+		return -EIO;
+	}
 
-	fastboot_okay("");
-	return;
+	return 0;
 }
diff --git a/common/fb_mmc.c b/common/fb_mmc.c
index 0c48cf929f8f..b31a9fb929c5 100644
--- a/common/fb_mmc.c
+++ b/common/fb_mmc.c
@@ -6,6 +6,7 @@
 
 #include <config.h>
 #include <common.h>
+#include <fastboot.h>
 #include <fb_mmc.h>
 #include <part.h>
 #include <aboot.h>
@@ -16,23 +17,8 @@
 #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
 #endif
 
-/* The 64 defined bytes plus the '\0' */
-#define RESPONSE_LEN	(64 + 1)
-
 static char *response_str;
 
-void fastboot_fail(const char *s)
-{
-	strncpy(response_str, "FAIL\0", 5);
-	strncat(response_str, s, RESPONSE_LEN - 4 - 1);
-}
-
-void fastboot_okay(const char *s)
-{
-	strncpy(response_str, "OKAY\0", 5);
-	strncat(response_str, s, RESPONSE_LEN - 4 - 1);
-}
-
 static int get_partition_info_efi_by_name_or_alias(block_dev_desc_t *dev_desc,
 		const char *name, disk_partition_t *info)
 {
@@ -68,7 +54,7 @@ static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
 
 	if (blkcnt > info->size) {
 		error("too large for partition: '%s'\n", part_name);
-		fastboot_fail("too large for partition");
+		fastboot_fail(response_str, "too large for partition");
 		return;
 	}
 
@@ -78,13 +64,13 @@ static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
 				     buffer);
 	if (blks != blkcnt) {
 		error("failed writing to device %d\n", dev_desc->dev);
-		fastboot_fail("failed writing to device");
+		fastboot_fail(response_str, "failed writing to device");
 		return;
 	}
 
 	printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 	       part_name);
-	fastboot_okay("");
+	fastboot_okay(response_str, "");
 }
 
 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
@@ -99,7 +85,7 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 		error("invalid mmc device\n");
-		fastboot_fail("invalid mmc device");
+		fastboot_fail(response_str, "invalid mmc device");
 		return;
 	}
 
@@ -109,20 +95,21 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 		if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 			printf("%s: invalid GPT - refusing to write to flash\n",
 			       __func__);
-			fastboot_fail("invalid GPT partition");
+			fastboot_fail(response_str, "invalid GPT partition");
 			return;
 		}
 		if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 			printf("%s: writing GPT partitions failed\n", __func__);
-			fastboot_fail("writing GPT partitions failed");
+			fastboot_fail(response_str,
+				      "writing GPT partitions failed");
 			return;
 		}
 		printf("........ success\n");
-		fastboot_okay("");
+		fastboot_okay(response_str, "");
 		return;
 	} else if (get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
 		error("cannot find partition: '%s'\n", cmd);
-		fastboot_fail("cannot find partition");
+		fastboot_fail(response_str, "cannot find partition");
 		return;
 	}
 
@@ -132,6 +119,8 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 	else
 		write_raw_image(dev_desc, &info, cmd, download_buffer,
 				download_bytes);
+
+	fastboot_okay(response_str, "");
 }
 
 void fb_mmc_erase(const char *cmd, char *response)
@@ -144,7 +133,7 @@ void fb_mmc_erase(const char *cmd, char *response)
 
 	if (mmc == NULL) {
 		error("invalid mmc device");
-		fastboot_fail("invalid mmc device");
+		fastboot_fail(response_str, "invalid mmc device");
 		return;
 	}
 
@@ -154,14 +143,14 @@ void fb_mmc_erase(const char *cmd, char *response)
 	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 		error("invalid mmc device");
-		fastboot_fail("invalid mmc device");
+		fastboot_fail(response_str, "invalid mmc device");
 		return;
 	}
 
 	ret = get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 	if (ret) {
 		error("cannot find partition: '%s'", cmd);
-		fastboot_fail("cannot find partition");
+		fastboot_fail(response_str, "cannot find partition");
 		return;
 	}
 
@@ -180,11 +169,11 @@ void fb_mmc_erase(const char *cmd, char *response)
 	blks = dev_desc->block_erase(dev_desc->dev, blks_start, blks_size);
 	if (blks != blks_size) {
 		error("failed erasing from device %d", dev_desc->dev);
-		fastboot_fail("failed erasing from device");
+		fastboot_fail(response_str, "failed erasing from device");
 		return;
 	}
 
 	printf("........ erased " LBAFU " bytes from '%s'\n",
 	       blks_size * info.blksz, cmd);
-	fastboot_okay("");
+	fastboot_okay(response_str, "");
 }
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index ca01a018b5d1..5703decfd360 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -13,6 +13,7 @@
 #include <config.h>
 #include <common.h>
 #include <errno.h>
+#include <fastboot.h>
 #include <malloc.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
@@ -34,9 +35,6 @@
 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
 
-/* The 64 defined bytes plus \0 */
-#define RESPONSE_LEN	(64 + 1)
-
 #define EP_BUFFER_SIZE			4096
 
 struct f_fastboot {
@@ -125,6 +123,19 @@ static struct usb_gadget_strings *fastboot_strings[] = {
 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
 static int strcmp_l1(const char *s1, const char *s2);
 
+
+void fastboot_fail(char *response, const char *reason)
+{
+	strncpy(response, "FAIL\0", 5);
+	strncat(response, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
+}
+
+void fastboot_okay(char *response, const char *reason)
+{
+	strncpy(response, "OKAY\0", 5);
+	strncat(response, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
+}
+
 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	int status = req->status;
@@ -358,7 +369,7 @@ static int strcmp_l1(const char *s1, const char *s2)
 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
-	char response[RESPONSE_LEN];
+	char response[FASTBOOT_RESPONSE_LEN];
 	const char *s;
 	size_t chars_left;
 
@@ -415,7 +426,7 @@ static unsigned int rx_bytes_expected(unsigned int maxpacket)
 #define BYTES_PER_DOT	0x20000
 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 {
-	char response[RESPONSE_LEN];
+	char response[FASTBOOT_RESPONSE_LEN];
 	unsigned int transfer_size = download_size - download_bytes;
 	const unsigned char *buffer = req->buf;
 	unsigned int buffer_size = req->actual;
@@ -472,7 +483,7 @@ static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 static void cb_download(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
-	char response[RESPONSE_LEN];
+	char response[FASTBOOT_RESPONSE_LEN];
 	unsigned int max;
 
 	strsep(&cmd, ":");
@@ -533,7 +544,7 @@ static void cb_continue(struct usb_ep *ep, struct usb_request *req)
 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
-	char response[RESPONSE_LEN];
+	char response[FASTBOOT_RESPONSE_LEN];
 
 	strsep(&cmd, ":");
 	if (!cmd) {
@@ -577,7 +588,7 @@ static void cb_oem(struct usb_ep *ep, struct usb_request *req)
 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
-	char response[RESPONSE_LEN];
+	char response[FASTBOOT_RESPONSE_LEN];
 
 	strsep(&cmd, ":");
 	if (!cmd) {
diff --git a/include/aboot.h b/include/aboot.h
index 30e4d36df8ba..18ff07a5dc23 100644
--- a/include/aboot.h
+++ b/include/aboot.h
@@ -9,9 +9,6 @@
 
 #define ROUNDUP(x, y)	(((x) + ((y) - 1)) & ~((y) - 1))
 
-void fastboot_fail(const char *s);
-void fastboot_okay(const char *s);
-
 static inline int is_sparse_image(void *buf)
 {
 	sparse_header_t *s_header = (sparse_header_t *)buf;
@@ -23,6 +20,6 @@ static inline int is_sparse_image(void *buf)
 	return 0;
 }
 
-void write_sparse_image(block_dev_desc_t *dev_desc,
-		disk_partition_t *info, const char *part_name,
-		void *data, unsigned sz);
+int write_sparse_image(block_dev_desc_t *dev_desc,
+		       disk_partition_t *info, const char *part_name,
+		       void *data, unsigned sz);
diff --git a/include/fastboot.h b/include/fastboot.h
new file mode 100644
index 000000000000..db826d20bfef
--- /dev/null
+++ b/include/fastboot.h
@@ -0,0 +1,22 @@
+/*
+ * (C) Copyright 2008 - 2009
+ * Windriver, <www.windriver.com>
+ * Tom Rix <Tom.Rix@windriver.com>
+ *
+ * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *
+ * Copyright 2014 Linaro, Ltd.
+ * Rob Herring <robh@kernel.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _FASTBOOT_H_
+#define _FASTBOOT_H_
+
+/* The 64 defined bytes plus \0 */
+#define FASTBOOT_RESPONSE_LEN	(64 + 1)
+
+void fastboot_fail(char *response, const char *reason);
+void fastboot_okay(char *response, const char *reason);
+
+#endif /* _FASTBOOT_H_ */
