This is quick fix for boot.

diff -Nru linux-2.5.64-ac3/drivers/ide/ide-probe.c linux-2.5.64-ac3-quick-fix/drivers/ide/ide-probe.c
--- linux-2.5.64-ac3/drivers/ide/ide-probe.c	2003-03-08 12:29:29.000000000 +0900
+++ linux-2.5.64-ac3-quick-fix/drivers/ide/ide-probe.c	2003-03-10 21:25:30.000000000 +0900
@@ -1392,7 +1392,8 @@
 			if (!hwif->present)
 				continue;
 			for (unit = 0; unit < MAX_DRIVES; ++unit)
-				ata_attach(&hwif->drives[unit]);
+				if (hwif->drives[unit].present)
+					ata_attach(&hwif->drives[unit]);
 		}
 	}
 	if (!ide_probe)
diff -Nru linux-2.5.64-ac3/drivers/ide/ide.c linux-2.5.64-ac3-quick-fix/drivers/ide/ide.c
--- linux-2.5.64-ac3/drivers/ide/ide.c	2003-03-08 12:29:29.000000000 +0900
+++ linux-2.5.64-ac3-quick-fix/drivers/ide/ide.c	2003-03-10 21:29:00.000000000 +0900
@@ -2377,7 +2377,8 @@
 	while (!list_empty(&list)) {
 		ide_drive_t *drive = list_entry(list.next, ide_drive_t, list);
 		list_del_init(&drive->list);
-		ata_attach(drive);
+		if (drive->present)
+			ata_attach(drive);
 	}
 	driver->gen_driver.name = (char *) driver->name;
 	driver->gen_driver.bus = &ide_bus_type;