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flash: pre-check flash unlock for stm32f2x 

add checking of the current flash lock status before performing the unlock sequence (which would fail in an unlocked state)

Change-Id: I693294c9cd2f59e69cb5bf3338120052fd680b1e
Signed-off-by: Bruno FLEURETTE <bruno.fleurette@gmail.com>
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/363
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Tested-by: jenkins
Reviewed-by: Mathias Küster <kesmtp@freenet.de>
__archive__
Bruno FLEURETTE 2012-01-10 16:21:00 +01:00 committed by Spencer Oliver
parent 06d1580ff7
commit 32d3063cf5
1 changed files with 11 additions and 1 deletions
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12
src/flash/nor/stm32f2x.c
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@ -234,8 +234,18 @@ static int stm32x_unlock_reg(struct target *target)
{
uint32_t ctrl;
/* first check if not already unlocked
* otherwise writing on STM32_FLASH_KEYR will fail
*/
int retval = target_read_u32(target, STM32_FLASH_CR, &ctrl);
if (retval != ERROR_OK)
return retval;
if ((ctrl & FLASH_LOCK) == 0)
return ERROR_OK;
/* unlock flash registers */
int retval = target_write_u32(target, STM32_FLASH_KEYR, KEY1);
retval = target_write_u32(target, STM32_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;