-#define CPC700_PMM0_LOCAL 0xff400000
-#define CPC700_PMM0_MASK_ATTR 0xff400004
-#define CPC700_PMM0_PCI_LOW 0xff400008
-#define CPC700_PMM0_PCI_HIGH 0xff40000c
+/* CPU -> PCI memory window 0 */
+#define CPC700_PMM0_LOCAL 0xff400000 /* CPU physical addr */
+#define CPC700_PMM0_MASK_ATTR 0xff400004 /* size and attrs */
+#define CPC700_PMM0_PCI_LOW 0xff400008 /* PCI addr, low word */
+#define CPC700_PMM0_PCI_HIGH 0xff40000c /* PCI addr, high wd */
+/* CPU -> PCI memory window 1 */