From db5f6790feaacc9b9ed1b74bd780b22f57744e4d Mon Sep 17 00:00:00 2001
From: Chris <chris@chrissnow.co.uk>
Date: Mon, 26 Jun 2017 23:08:54 +0100
Subject: [PATCH] clear additional flags on erase to prevent errors

---
 targets/TARGET_STM/TARGET_STM32L1/flash_api.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/targets/TARGET_STM/TARGET_STM32L1/flash_api.c b/targets/TARGET_STM/TARGET_STM32L1/flash_api.c
index 68927d5651..755770d2f3 100644
--- a/targets/TARGET_STM/TARGET_STM32L1/flash_api.c
+++ b/targets/TARGET_STM/TARGET_STM32L1/flash_api.c
@@ -50,9 +50,7 @@ int32_t flash_erase_sector(flash_t *obj, uint32_t address)
         return -1;
     }
 
-    /* Clear OPTVERR bit set on virgin samples */
-    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
-
+	__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_PGAERR | FLASH_FLAG_WRPERR);
     /* MBED HAL erases 1 sector at a time */
     /* Fill EraseInit structure*/
     EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;