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arm: stm32f4: fix a bug when a random sector gets erased

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Old sector number is not being cleared from FLASH_CR register. For example
when first erased sector was 001 and then you want to erase sector 010,
sector 011 gets erased instead.
This patch clears old sector number from FLASH_CR register before a new
one is written.

Signed-off-by: Vadzim Dambrouski <pftbest@gmail.com>
This commit is contained in:
Vadzim Dambrouski 2015-10-23 21:14:07 +03:00 committed by Albert ARIBAUD
parent 4cd3246f2a
commit 43fb0e3926
2 changed files with 4 additions and 0 deletions
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3
arch/arm/cpu/armv7m/stm32f4/flash.c
View file

@ -97,6 +97,9 @@ int flash_erase(flash_info_t *info, int first, int last)
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
/* clear old sector number before writing a new one */
clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SNB_MASK);
if (bank == 0) {
setbits_le32(&STM32_FLASH->cr,
(i << STM32_FLASH_CR_SNB_OFFSET));

1
arch/arm/include/asm/arch-stm32f4/stm32.h
View file

@ -104,6 +104,7 @@ struct stm32_flash_regs {
#define STM32_FLASH_CR_STRT (1 << 16)
#define STM32_FLASH_CR_LOCK (1 << 31)
#define STM32_FLASH_CR_SNB_OFFSET 3
#define STM32_FLASH_CR_SNB_MASK (15 << STM32_FLASH_CR_SNB_OFFSET)
enum clock {
CLOCK_CORE,