diff --git a/src/include/superio/conf_mode.h b/src/include/superio/conf_mode.h
index b93b889a96..c49cae7e5a 100644
--- a/src/include/superio/conf_mode.h
+++ b/src/include/superio/conf_mode.h
@@ -27,8 +27,11 @@
 void pnp_enter_conf_mode_55(device_t dev);
 void pnp_enter_conf_mode_8787(device_t dev);
 void pnp_exit_conf_mode_aa(device_t dev);
+void pnp_enter_conf_mode_870155aa(device_t dev);
+void pnp_exit_conf_mode_0202(device_t dev);
 
 extern const struct pnp_mode_ops pnp_conf_mode_55_aa;
 extern const struct pnp_mode_ops pnp_conf_mode_8787_aa;
+extern const struct pnp_mode_ops pnp_conf_mode_870155_aa;
 
-#endif
+#endif /* DEVICE_PNP_CONF_MODE_H */
diff --git a/src/superio/common/conf_mode.c b/src/superio/common/conf_mode.c
index 40583ffc49..f3e6277b22 100644
--- a/src/superio/common/conf_mode.c
+++ b/src/superio/common/conf_mode.c
@@ -39,6 +39,25 @@ void pnp_exit_conf_mode_aa(device_t dev)
 	outb(0xaa, dev->path.pnp.port);
 }
 
+void pnp_enter_conf_mode_870155aa(device_t dev)
+{
+	outb(0x87, dev->path.pnp.port);
+	outb(0x01, dev->path.pnp.port);
+	outb(0x55, dev->path.pnp.port);
+
+	if (dev->path.pnp.port == 0x4e)
+		outb(0xaa, dev->path.pnp.port);
+	else
+		outb(0x55, dev->path.pnp.port);
+}
+
+void pnp_exit_conf_mode_0202(device_t dev)
+{
+	outb(0x02, dev->path.pnp.port);
+	outb(0x02, dev->path.pnp.port + 1);
+}
+
+
 const struct pnp_mode_ops pnp_conf_mode_55_aa = {
 	.enter_conf_mode = pnp_enter_conf_mode_55,
 	.exit_conf_mode  = pnp_exit_conf_mode_aa,
@@ -48,3 +67,8 @@ const struct pnp_mode_ops pnp_conf_mode_8787_aa = {
 	.enter_conf_mode = pnp_enter_conf_mode_8787,
 	.exit_conf_mode  = pnp_exit_conf_mode_aa,
 };
+
+const struct pnp_mode_ops pnp_conf_mode_870155_aa = {
+	.enter_conf_mode = pnp_enter_conf_mode_870155aa,
+	.exit_conf_mode  = pnp_exit_conf_mode_0202,
+};