+ Call prom_scsiid() to found out what the host SCSI ID should

be instead of hardcoding values.
 + Print the host SCSI ID in siiattach().

XXX - probably should do the same to the ASC driver??  The manuals for
the 5000 series machines don't mention the scsiidN env variable, but it
is present on all the models I've looked at...

sys/arch/pmax/dev/sii.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: sii.c,v 1.35 1999/04/24 08:01:08 simonb Exp $	*/
+/*	$NetBSD: sii.c,v 1.36 1999/06/08 23:41:59 simonb Exp $	*/
 
 /*-
  * Copyright (c) 1992, 1993
@@ -71,6 +71,7 @@
 #include <pmax/dev/siivar.h>		/* softc and prototypes */
 
 #include <pmax/pmax/pmaxtype.h>		/* Definition of DS_PMAX */
+#include <pmax/pmax/machdep.h>		/* prom_scsiid prototype */
 
 /* Machine-indepedent back-end attach entry point */
 void	siiattach __P((struct siisoftc *sc));
@@ -219,6 +220,7 @@ siiattach(sc)
 #ifdef USE_NEW_SCSI
 	/* XXX probe SCSI bus and attach slave devices */
 #endif
+	printf(": target %d", sc->sc_regs->id & SII_IDMSK);
 }
 
 
@@ -302,12 +304,9 @@ sii_Reset(sc, reset)
 	 */
 	regs->csr = SII_HPM;
 	/*
-	 * Set host adapter ID (6 for PMIN/PMAX, 7 for everything else)
+	 * Set host adapter ID (from PROM sciiidN variable).
 	 */
-	if (systype == DS_PMAX)
-		regs->id = SII_ID_IO | 6;
-	else
-		regs->id = SII_ID_IO | 7;
+	regs->id = SII_ID_IO | prom_scsiid(sc->sc_dev.dv_unit);
 	/*
 	 * Enable SII to drive the SCSI bus.
 	 */