diff --git a/arch/arm/src/lpc214x/lpc214x_usbdev.c b/arch/arm/src/lpc214x/lpc214x_usbdev.c
index 639b7b9149..4347180e1a 100644
--- a/arch/arm/src/lpc214x/lpc214x_usbdev.c
+++ b/arch/arm/src/lpc214x/lpc214x_usbdev.c
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * arch/arm/src/lpc214x/lpc214x_usbdev.c
  *
- *   Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2010 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/arch/arm/src/sam3u/sam3u_dmac.c b/arch/arm/src/sam3u/sam3u_dmac.c
index 489d81bc18..510ac7e8a3 100755
--- a/arch/arm/src/sam3u/sam3u_dmac.c
+++ b/arch/arm/src/sam3u/sam3u_dmac.c
@@ -69,6 +69,12 @@
 
 #ifdef CONFIG_SAM3U_DMA
 
+/* If AT90SAM3U support is enabled, then OS DMA support should also be enabled */
+
+#ifndef CONFIG_ARCH_DMA
+#  warning "ATSAM3U DMA enabled but CONFIG_ARCH_DMA disabled"
+#endif
+
 /* Check the number of link list descriptors to allocate */
 
 #ifndef CONFIG_SAM3U_NLLDESC