1 files changed, 8 insertions, 0 deletions
diff --git a/sim/bfin/dv-bfin_cec.c b/sim/bfin/dv-bfin_cec.c
index 186edcb..8ce0d2c 100644
--- a/sim/bfin/dv-bfin_cec.c
+++ b/sim/bfin/dv-bfin_cec.c
@@ -82,6 +82,10 @@ bfin_cec_io_write_buffer (struct hw *me, const void *source,
   bu32 mmr_off;
   bu32 value;
 
+  /* Invalid access mode is higher priority than missing register.  */
+  if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
+    return 0;
+
   value = dv_load_4 (source);
   mmr_off = addr - cec->base;
 
@@ -118,6 +122,10 @@ bfin_cec_io_read_buffer (struct hw *me, void *dest,
   bu32 mmr_off;
   bu32 *valuep;
 
+  /* Invalid access mode is higher priority than missing register.  */
+  if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
+    return 0;
+
   mmr_off = addr - cec->base;
   valuep = (void *)((unsigned long)cec + mmr_base() + mmr_off);