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flash/nor/stm32f1x: fix options reading from locked chip 

In commit cea40152f8 option bytes
reading was changed to direct access to option bytes area.
While there are no problems with stm32f0xx and stm32f3xx chips,
option block (0x1ffff800..0x1ffff80F) is unreadable from locked
stm32f10x chips.
As a result, stm32f1x unlock command writes dirty values to user
options, user data and write protection bits.

Option bytes reading reverted from direct access to option bytes area
to reading currently loaded bytes from  FLASH_OBR/FLASH_WRPR registers.

Tested on stm32f100, stm32f103, stm32f107 as well as on stm32f030 and
stm32f303.

Change-Id: Iad476351ffdaca5ace12e02272dacea7f3d08f52
Signed-off-by: Oleksandr Redchuk <real@real.kiev.ua>
Reviewed-on: http://openocd.zylin.com/4940
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Oleksandr Redchuk 2019-02-23 23:03:13 +02:00 committed by Tomas Vanek
parent 223c28f9b9
commit 7f5caa24e3
1 changed files with 6 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/flash/nor/stm32f1x.c
View File

@ -229,34 +229,20 @@ static int stm32x_read_options(struct flash_bank *bank)
uint32_t option_bytes;
int retval;
/* read user and read protection option bytes */
retval = target_read_u32(target, STM32_OB_RDP, &option_bytes);
/* read user and read protection option bytes, user data option bytes */
retval = target_read_u32(target, STM32_FLASH_OBR_B0, &option_bytes);
if (retval != ERROR_OK)
return retval;
stm32x_info->option_bytes.rdp = option_bytes & 0xFF;
stm32x_info->option_bytes.user = (option_bytes >> 16) & 0xFF;
/* read user data option bytes */
retval = target_read_u32(target, STM32_OB_DATA0, &option_bytes);
if (retval != ERROR_OK)
return retval;
stm32x_info->option_bytes.data = ((option_bytes >> 8) & 0xFF00) | (option_bytes & 0xFF);
stm32x_info->option_bytes.rdp = (option_bytes & (1 << OPT_READOUT)) ? 0 : stm32x_info->default_rdp;
stm32x_info->option_bytes.user = (option_bytes >> stm32x_info->option_offset >> 2) & 0xff;
stm32x_info->option_bytes.data = (option_bytes >> stm32x_info->user_data_offset) & 0xffff;
/* read write protection option bytes */
retval = target_read_u32(target, STM32_OB_WRP0, &option_bytes);
retval = target_read_u32(target, STM32_FLASH_WRPR_B0, &stm32x_info->option_bytes.protection);
if (retval != ERROR_OK)
return retval;
stm32x_info->option_bytes.protection = ((option_bytes >> 8) & 0xFF00) | (option_bytes & 0xFF);
retval = target_read_u32(target, STM32_OB_WRP2, &option_bytes);
if (retval != ERROR_OK)
return retval;
stm32x_info->option_bytes.protection |= (((option_bytes >> 8) & 0xFF00) | (option_bytes & 0xFF)) << 16;
return ERROR_OK;
}