bootcount: flush after storing the bootcounter

If the bootcounter address is in a cached memory,
a flush of dcache must occur after updateing the bootcounter.

Issue found on i.MX6 where bootcounter is put into the internal
(cached) IRAM.

Signed-off-by: Stefano Babic <sbabic@denx.de>

diff --git a/drivers/bootcount/bootcount.c b/drivers/bootcount/bootcount.c
index e00d81c..a3162c9 100644 (file)
--- a/drivers/bootcount/bootcount.c
+++ b/drivers/bootcount/bootcount.c
@@ -18,6 +18,9 @@ __weak void bootcount_store(ulong a)
        raw_bootcount_store(reg, a);
        raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD */
+       flush_dcache_range(CONFIG_SYS_BOOTCOUNT_ADDR,
+                               CONFIG_SYS_BOOTCOUNT_ADDR +
+                               CONFIG_SYS_CACHELINE_SIZE);
 }
 
 __weak ulong bootcount_load(void)