fix on stm32l4 to clear flash mass erase flags on CR

diff --git a/src/stlink-common.c b/src/stlink-common.c
index 4ad28eef376397014130be2ae0562be4cac9f342..f2888d10b4a1ad1b072d83e96e39b7a6915dd66d 100644 (file)
--- a/src/stlink-common.c
+++ b/src/stlink-common.c
@@ -435,6 +435,8 @@ static inline void write_flash_cr_bker_pnb(stlink_t *sl, uint32_t n) {
     uint32_t x = read_flash_cr(sl);
     x &=~ STM32L4_FLASH_CR_OPBITS;
     x &=~ STM32L4_FLASH_CR_PAGEMASK;
+    x &= ~(1<<STM32L4_FLASH_CR_MER1);
+    x &= ~(1<<STM32L4_FLASH_CR_MER2);
     x |= (n << STM32L4_FLASH_CR_PNB);
     x |= (1lu << STM32L4_FLASH_CR_PER);
 #if DEBUG_FLASH