--- src/sys/platform/pc32/i386/busdma_machdep.c	2007/06/03 11:47:10	1.19
+++ src/sys/platform/pc32/i386/busdma_machdep.c	2007/06/03 13:02:24	1.20
@@ -525,7 +525,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_
 			/*
 			 * Limit to the boundary and maximum segment size
 			 */
-			if ((nextpaddr ^ sg->ds_addr) & bmask) {
+			if (((nextpaddr - 1) ^ sg->ds_addr) & bmask) {
 				tmpsize = dmat->boundary -
 					  (sg->ds_addr & ~bmask);
 				if (tmpsize > dmat->maxsegsz)