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-rw-r--r--hw/isa/vt82c686.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 2bd10d9101..766584cabd 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -26,6 +26,7 @@
 #include "hw/acpi/acpi.h"
 #include "hw/i2c/pm_smbus.h"
 #include "qapi/error.h"
+#include "qemu/log.h"
 #include "qemu/module.h"
 #include "qemu/range.h"
 #include "qemu/timer.h"
@@ -279,6 +280,8 @@ static void superio_cfg_write(void *opaque, hwaddr addr, uint64_t data,
         return;
     /* case 0xe6 ... 0xe8: Should set base port of parallel and serial */
     default:
+        qemu_log_mask(LOG_UNIMP,
+                      "via_superio_cfg: unimplemented register 0x%x\n", idx);
         break;
     }
     sc->regs[idx] = data & 0xff;