From 4e8c461f4667c7e3799fafc2c1f22bca5d7506bb Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benpicco@googlemail.com>
Date: Wed, 28 Oct 2020 23:34:31 +0100
Subject: [PATCH] cpu/sam0_common: flashpage: invalidate cache on _lock()

---
 cpu/sam0_common/periph/flashpage.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cpu/sam0_common/periph/flashpage.c b/cpu/sam0_common/periph/flashpage.c
index 2590d97adc..814415ee05 100644
--- a/cpu/sam0_common/periph/flashpage.c
+++ b/cpu/sam0_common/periph/flashpage.c
@@ -84,6 +84,11 @@ static void _lock(void)
 #else
     PAC1->WPSET.reg = PAC1_WPROT_DEFAULT_VAL;
 #endif
+
+    /* cached flash contents may have changed - invalidate cache */
+#ifdef CMCC
+    CMCC->MAINT0.bit.INVALL = 1;
+#endif
 }
 
 static void _cmd_clear_page_buffer(void)