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 <vikas.mano...@st.com>
---
drivers/mtd/stm32_flash.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mtd/stm32_flash.c b/drivers/mtd/stm32_flash.c
index 71f4854..e16b6cd 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)
;
}
--
1.9.1
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