diff --git a/ports/arm/platforms/dm36x/dm36x-io.h b/ports/arm/platforms/dm36x/dm36x-io.h
index 6419efa..afdb553 100644
--- a/ports/arm/platforms/dm36x/dm36x-io.h
+++ b/ports/arm/platforms/dm36x/dm36x-io.h
@@ -521,6 +521,10 @@
 #define DM36X_SD_MMCRSP67   0x44
 #define DM36X_SD_MMCDRSP    0x48
 #define DM36X_SD_MMCCIDX    0X50
+#define DM36X_SD_SDIOCTL    0X64
+#define DM36X_SD_SDIOST0    0X68
+#define DM36X_SD_SDIOIEN    0X6C
+#define DM36X_SD_SDIOIST    0X70
 #define DM36X_SD_MMCFIFOCTL 0x74