diff --git a/drivers/st/io/io_mmc.c b/drivers/st/io/io_mmc.c
index 0ed7154..2bf88e6 100644
--- a/drivers/st/io/io_mmc.c
+++ b/drivers/st/io/io_mmc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -29,6 +29,7 @@
 static io_type_t device_type_mmc(void);
 
 static signed long long seek_offset;
+static size_t (*_read_blocks)(int lba, uintptr_t buf, size_t size);
 
 static const io_dev_connector_t mmc_dev_connector = {
 	.dev_open = mmc_dev_open
@@ -60,9 +61,15 @@
 /* Open a connection to the mmc device */
 static int mmc_dev_open(const uintptr_t init_params, io_dev_info_t **dev_info)
 {
+	struct io_mmc_dev_spec *device_spec =
+		(struct io_mmc_dev_spec *)init_params;
+
 	assert(dev_info != NULL);
 	*dev_info = (io_dev_info_t *)&mmc_dev_info;
 
+	_read_blocks = !device_spec->use_boot_part ?
+		mmc_read_blocks : mmc_boot_part_read_blocks;
+
 	return 0;
 }
 
@@ -100,8 +107,8 @@
 	uint8_t retries;
 
 	for (retries = 0U; retries < 3U; retries++) {
-		*length_read = mmc_read_blocks(seek_offset / MMC_BLOCK_SIZE,
-					       buffer, length);
+		*length_read = _read_blocks(seek_offset / MMC_BLOCK_SIZE,
+					    buffer, length);
 
 		if (*length_read == length) {
 			return 0;