diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 5786dd3..97ed1fa 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -546,6 +546,13 @@
    PLAT_PARTITION_MAX_ENTRIES := 12
    $(eval $(call add_define,PLAT_PARTITION_MAX_ENTRIES))
 
+-  **PLAT_PARTITION_BLOCK_SIZE**
+   The size of partition block. It could be either 512 bytes or 4096 bytes.
+   The default value is 512.
+   `For example, define the build flag in platform.mk`_:
+   PLAT_PARTITION_BLOCK_SIZE := 4096
+   $(eval $(call add_define,PLAT_PARTITION_BLOCK_SIZE))
+
 The following constant is optional. It should be defined to override the default
 behaviour of the ``assert()`` function (for example, to save memory).
 
diff --git a/drivers/partition/gpt.c b/drivers/partition/gpt.c
index 4577f06..1b804de 100644
--- a/drivers/partition/gpt.c
+++ b/drivers/partition/gpt.c
@@ -52,9 +52,10 @@
 	if (result != 0) {
 		return result;
 	}
-	entry->start = (uint64_t)gpt_entry->first_lba * PARTITION_BLOCK_SIZE;
+	entry->start = (uint64_t)gpt_entry->first_lba *
+		       PLAT_PARTITION_BLOCK_SIZE;
 	entry->length = (uint64_t)(gpt_entry->last_lba -
 				   gpt_entry->first_lba + 1) *
-			PARTITION_BLOCK_SIZE;
+			PLAT_PARTITION_BLOCK_SIZE;
 	return 0;
 }
diff --git a/drivers/partition/partition.c b/drivers/partition/partition.c
index 7fdbf53..68133ea 100644
--- a/drivers/partition/partition.c
+++ b/drivers/partition/partition.c
@@ -15,7 +15,7 @@
 #include <drivers/partition/mbr.h>
 #include <plat/common/platform.h>
 
-static uint8_t mbr_sector[PARTITION_BLOCK_SIZE];
+static uint8_t mbr_sector[PLAT_PARTITION_BLOCK_SIZE];
 static partition_entry_list_t list;
 
 #if LOG_LEVEL >= LOG_LEVEL_VERBOSE
@@ -57,15 +57,15 @@
 		return result;
 	}
 	result = io_read(image_handle, (uintptr_t)&mbr_sector,
-			 PARTITION_BLOCK_SIZE, &bytes_read);
+			 PLAT_PARTITION_BLOCK_SIZE, &bytes_read);
 	if (result != 0) {
 		WARN("Failed to read data (%i)\n", result);
 		return result;
 	}
 
 	/* Check MBR boot signature. */
-	if ((mbr_sector[PARTITION_BLOCK_SIZE - 2] != MBR_SIGNATURE_FIRST) ||
-	    (mbr_sector[PARTITION_BLOCK_SIZE - 1] != MBR_SIGNATURE_SECOND)) {
+	if ((mbr_sector[LEGACY_PARTITION_BLOCK_SIZE - 2] != MBR_SIGNATURE_FIRST) ||
+	    (mbr_sector[LEGACY_PARTITION_BLOCK_SIZE - 1] != MBR_SIGNATURE_SECOND)) {
 		return -ENOENT;
 	}
 	offset = (uintptr_t)&mbr_sector + MBR_PRIMARY_ENTRY_OFFSET;
@@ -120,15 +120,15 @@
 		return result;
 	}
 	result = io_read(image_handle, (uintptr_t)&mbr_sector,
-			 PARTITION_BLOCK_SIZE, &bytes_read);
+			 PLAT_PARTITION_BLOCK_SIZE, &bytes_read);
 	if (result != 0) {
 		WARN("Failed to read data (%i)\n", result);
 		return result;
 	}
 
 	/* Check MBR boot signature. */
-	if ((mbr_sector[PARTITION_BLOCK_SIZE - 2] != MBR_SIGNATURE_FIRST) ||
-	    (mbr_sector[PARTITION_BLOCK_SIZE - 1] != MBR_SIGNATURE_SECOND)) {
+	if ((mbr_sector[LEGACY_PARTITION_BLOCK_SIZE - 2] != MBR_SIGNATURE_FIRST) ||
+	    (mbr_sector[LEGACY_PARTITION_BLOCK_SIZE - 1] != MBR_SIGNATURE_SECOND)) {
 		return -ENOENT;
 	}
 	offset = (uintptr_t)&mbr_sector +
diff --git a/include/drivers/partition/gpt.h b/include/drivers/partition/gpt.h
index 3ae160f..d923e95 100644
--- a/include/drivers/partition/gpt.h
+++ b/include/drivers/partition/gpt.h
@@ -10,9 +10,9 @@
 #include <drivers/partition/partition.h>
 
 #define PARTITION_TYPE_GPT		0xee
-#define GPT_HEADER_OFFSET		PARTITION_BLOCK_SIZE
+#define GPT_HEADER_OFFSET		PLAT_PARTITION_BLOCK_SIZE
 #define GPT_ENTRY_OFFSET		(GPT_HEADER_OFFSET +		\
-					 PARTITION_BLOCK_SIZE)
+					 PLAT_PARTITION_BLOCK_SIZE)
 #define GUID_LEN			16
 
 #define GPT_SIGNATURE			"EFI PART"
diff --git a/include/drivers/partition/partition.h b/include/drivers/partition/partition.h
index d94c782..5f64833 100644
--- a/include/drivers/partition/partition.h
+++ b/include/drivers/partition/partition.h
@@ -17,7 +17,15 @@
 
 CASSERT(PLAT_PARTITION_MAX_ENTRIES <= 128, assert_plat_partition_max_entries);
 
-#define PARTITION_BLOCK_SIZE		512
+#if !PLAT_PARTITION_BLOCK_SIZE
+# define PLAT_PARTITION_BLOCK_SIZE	512
+#endif /* PLAT_PARTITION_BLOCK_SIZE */
+
+CASSERT((PLAT_PARTITION_BLOCK_SIZE == 512) ||
+	(PLAT_PARTITION_BLOCK_SIZE == 4096),
+	assert_plat_partition_block_size);
+
+#define LEGACY_PARTITION_BLOCK_SIZE	512
 
 #define EFI_NAMELEN			36