Index: bus_dma.c
===================================================================
RCS file: /cvs/src/sys/arch/landisk/landisk/bus_dma.c,v
retrieving revision 1.12
diff -u -p -r1.12 bus_dma.c
--- bus_dma.c	16 Nov 2014 12:30:57 -0000	1.12
+++ bus_dma.c	22 Jan 2015 00:32:12 -0000
@@ -379,20 +379,42 @@ _bus_dmamap_load_mbuf(bus_dma_tag_t t, b
 			continue;
 
 		vaddr = (vaddr_t)(m->m_data);
-		paddr = (paddr_t)(SH3_P1SEG_TO_PHYS(vaddr));
-		size = m->m_len;
+		if ((vaddr >= SH3_P1SEG_BASE) &&
+		    (vaddr + m->m_len <= SH3_P2SEG_END)) {
+			paddr = SH3_P1SEG_TO_PHYS(vaddr);
+			size = m->m_len;
+		} else {
+			vaddr_t next, end;
+
+			end = vaddr + m->m_len;
+			for (next = (vaddr + PAGE_SIZE) & ~PAGE_MASK;
+			    next < end; next += PAGE_SIZE) {
+				pmap_extract(pmap_kernel(), vaddr, &paddr);
+				error = _bus_dmamap_load_paddr(t, map,
+				    paddr, vaddr, next - vaddr,
+				    &seg, &lastaddr, first);
+				if (error != 0)
+					return (error);
+
+				first = 0;
+				vaddr = next;
+			}
+
+			pmap_extract(pmap_kernel(), vaddr, &paddr);
+			size = end - vaddr;
+		}
+
 		error = _bus_dmamap_load_paddr(t, map, paddr, vaddr, size,
 		    &seg, &lastaddr, first);
-		first = 0;
-	}
+		if (error != 0)
+			return (error);
 
-	if (error == 0) {
-		map->dm_nsegs = seg + 1;
-		map->dm_mapsize = m0->m_pkthdr.len;
-		return (0);
+		first = 0;
 	}
 
-	return (error);
+	map->dm_nsegs = seg + 1;
+	map->dm_mapsize = m0->m_pkthdr.len;
+	return (0);
 }
 
 /*