Index: kernel/genarch/src/drivers/bcm2835/mbox.c
===================================================================
--- kernel/genarch/src/drivers/bcm2835/mbox.c	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ kernel/genarch/src/drivers/bcm2835/mbox.c	(revision 6bf5b8cd8ea2cab6203e1dd42e25d90fd7628fa6)
@@ -93,5 +93,5 @@
 
 	fb_mbox = (void *) km_map(BCM2835_MBOX0_ADDR, sizeof(bcm2835_mbox_t),
-	    PAGE_NOT_CACHEABLE);
+	    KM_NATURAL_ALIGNMENT, PAGE_NOT_CACHEABLE);
 
 	fb_desc->width = 640;