Index: head/sys/dev/fb/fbd.c
===================================================================
--- head/sys/dev/fb/fbd.c
+++ head/sys/dev/fb/fbd.c
@@ -178,6 +178,8 @@
 			*paddr = vtophys((uint8_t *)info->fb_vbase + offset);
 		else
 			*paddr = info->fb_pbase + offset;
+		if (info->fb_flags & FB_FLAG_MEMATTR)
+			*memattr = info->fb_memattr;
 		return (0);
 	}
 	return (EINVAL);
Index: head/sys/sys/fbio.h
===================================================================
--- head/sys/sys/fbio.h
+++ head/sys/sys/fbio.h
@@ -142,6 +142,8 @@
 	uint32_t	fb_flags;
 #define	FB_FLAG_NOMMAP		1	/* mmap unsupported. */
 #define	FB_FLAG_NOWRITE		2	/* disable writes for the time being */
+#define	FB_FLAG_MEMATTR		4	/* override memattr for mmap */
+	vm_memattr_t	fb_memattr;
 	int		fb_stride;
 	int		fb_bpp;		/* bits per pixel */
 	uint32_t	fb_cmap[16];