From a7f23635a40951fd968115d94ed3e51250604c1c Mon Sep 17 00:00:00 2001
From: Deepika <deepika.bhavnani@arm.com>
Date: Tue, 27 Jun 2017 14:00:44 -0500
Subject: [PATCH] Added pre-erase command to boost multiple write block
 performance

---
 features/filesystem/sd/SDBlockDevice.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/features/filesystem/sd/SDBlockDevice.cpp b/features/filesystem/sd/SDBlockDevice.cpp
index 34bf08f0e1..a162875ee1 100644
--- a/features/filesystem/sd/SDBlockDevice.cpp
+++ b/features/filesystem/sd/SDBlockDevice.cpp
@@ -410,6 +410,8 @@ int SDBlockDevice::program(const void *b, bd_addr_t addr, bd_size_t size)
          */
         status = _cmd(CMD13_SEND_STATUS, 0);
     } else {
+        // Pre-erase setting prior to multiple block write operation
+        _cmd(ACMD23_SET_WR_BLK_ERASE_COUNT, blockCnt, 1);
         // Multiple block write command
         if (BD_ERROR_OK != (status = _cmd(CMD25_WRITE_MULTIPLE_BLOCK, addr))) {
             _lock.unlock();