From: Stefano Babic <sbabic@denx.de>
Date: Thu, 22 Feb 2018 11:30:41 +0000 (+0100)
Subject: bootcount: flush after storing the bootcounter
X-Git-Tag: v2018.09-rc1~63^2~50
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=1947c2d2a08fb07330d15fc30416969afbe61bbc;p=oweals%2Fu-boot.git

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 e00d81c934..a3162c97ed 100644
--- 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)