diff options
| author | Vikas Manocha <[email protected]> | 2016-04-04 16:49:02 -0700 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2016-04-11 20:48:23 -0400 |
| commit | 9082517a85930740f59966fcf13293c38792afe8 (patch) | |
| tree | d8ad6f8b0c3b1d64edadd7291938f80019447f22 | |
| parent | 3ba1352b97999546610cc9b8708281b60d660e48 (diff) | |
stm32: stm32_flash: add memory barrier during flash write
After writing data to flash space, next instruction is checking if flash
controller is busy writing to the flash memory. Memory barrier is required here
to avoid transaction re-ordering for data write and busy status check.
Signed-off-by: Vikas Manocha <[email protected]>
| -rw-r--r-- | drivers/mtd/stm32_flash.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mtd/stm32_flash.c b/drivers/mtd/stm32_flash.c index 71f48543a39..e16b6cd674f 100644 --- a/drivers/mtd/stm32_flash.c +++ b/drivers/mtd/stm32_flash.c @@ -137,6 +137,10 @@ int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt) /* To make things simple use byte writes only */ for (i = 0; i < cnt; i++) { *(uchar *)(addr + i) = src[i]; + /* avoid re-ordering flash data write and busy status + * check as flash memory space attributes are generally Normal + */ + mb(); while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY) ; } |