diff --git a/board/renesas/lager/lager.c b/board/renesas/lager/lager.c
index cdd5b32..ad5289a 100644
--- a/board/renesas/lager/lager.c
+++ b/board/renesas/lager/lager.c
@@ -254,6 +254,12 @@
 	return 0;
 }
 
+void arch_preboot_os(void)
+{
+	/* Disable TMU0 */
+	mstp_setbits_le32(MSTPSR1, SMSTPCR1, TMU0_MSTP125);
+}
+
 DECLARE_GLOBAL_DATA_PTR;
 int board_init(void)
 {