diff -urN linux-2.2.18p25/drivers/scsi/megaraid.c linux-2.2.18p25+megaraidfix/drivers/scsi/megaraid.c
--- linux-2.2.18p25/drivers/scsi/megaraid.c	Fri Dec  8 16:10:27 2000
+++ linux-2.2.18p25+megaraidfix/drivers/scsi/megaraid.c	Fri Dec  8 16:12:07 2000
@@ -1908,10 +1908,14 @@
 
     pciIdx++;
 
-    if (flag & BOARD_QUARTZ)
+    if (flag & BOARD_QUARTZ) {
+       megaBase &= PCI_BASE_ADDRESS_MEM_MASK;
        megaBase = (long) ioremap (megaBase, 128);
-    else
+    }
+    else {
+       megaBase &= PCI_BASE_ADDRESS_MEM_MASK;
        megaBase += 0x10;
+    }
 
     /* Initialize SCSI Host structure */
     host = scsi_register (pHostTmpl, sizeof (mega_host_config));