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-rw-r--r--src/platforms/stm32/usbdfu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/platforms/stm32/usbdfu.c b/src/platforms/stm32/usbdfu.c
index 55318ec..212b88e 100644
--- a/src/platforms/stm32/usbdfu.c
+++ b/src/platforms/stm32/usbdfu.c
@@ -408,7 +408,10 @@ int main(void)
}
#if defined (STM32F4)
- /* don' touch option bits for now */
+ if ((FLASH_OPTCR & 0x10000) != 0) {
+ flash_program_option_bytes(FLASH_OPTCR & ~0x10000);
+ flash_lock_option_bytes();
+ }
#else
if ((FLASH_WRPR & 0x03) != 0x00) {
flash_unlock();