Kernel does not boot with NetBSD-9.3/sgimips installation CD on Indigo2

[<iwama%t3.rim.or.jp@localhost>]

Dear NetBSD/sgimips users

I am unable to boot the NetBSD-9.3 installer on my Indigo2. When booting
from the installation CD, the kernel fails to boot.

>> hinv
                   System: IP22
                Processor: 250 Mhz R4400, with FPU
     Primary I-cache size: 16 Kbytes
     Primary D-cache size: 16 Kbytes
     Secondary cache size: 2048 Kbytes
              Memory size: 128 Mbytes
                 Graphics: High-AA Impact
               SCSI CDROM: scsi(0)cdrom(3)
                SCSI Disk: scsi(1)disk(1)
                SCSI Disk: scsi(1)disk(2)
                    Audio: Iris Audio Processor: version A2 revision 1.1.0
>> version
PROM Monitor SGI Version 5.3 Rev E IP22 Sep 21, 1995 (BE)
>> boot -f scsi(0)cdrom(3)partition(8)ip2xboot

NetBSD/sgimips 9.3 Bootstrap, Revision 1.5 (Thu Aug  4 15:30:37 UTC 2022)

devopen: scsi(0)cdrom(3)partition(0) type scsi file ip2x
6845776+112432=0x6a30d8
[   1.0000000] phys segment: 0xe000 @ 0x8002000
[   1.0000000] adding 0xe000 @ 0x8002000 to freelist 0
[   1.0000000] phys segment: 0x730000 @ 0x8010000
[   1.0000000] adding 0x58000 @ 0x8010000 to freelist 0
[   1.0000000] adding 0x3c000 @ 0x8704000 to freelist 0
[   1.0000000] phys segment: 0x7800000 @ 0x8800000
[   1.0000000] adding 0x7800000 @ 0x8800000 to freelist 0
[   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
2004, 2005,
[   1.0000000]     2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
2015, 2016, 2017,
[   1.0000000]     2018, 2019, 2020, 2021, 2022
[   1.0000000]     The NetBSD Foundation, Inc.  All rights reserved.
[   1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
[   1.0000000]     The Regents of the University of California.  All rights
reserved.

[   1.0000000] NetBSD 9.3 (INSTALL32_IP2x) #0: Thu Aug  4 15:30:37 UTC 2022
[   1.0000000]
mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/sgimips/compile/INSTALL32_IP2x
[   1.0000000] total memory = 128 MB
[   1.0000000] (768 KB reserved for ARCS)
[   1.0000000] avail memory = 118 MB
[   1.0000000] mainbus0 (root): SGI-IP22 [SGI, 6909b2c8], 1 processor
[   1.0000000] cpu0 at mainbus0: MIPS R4400 CPU (0x460) Rev. 6.0 with MIPS
R4010 FPC Rev. 0.0
[   1.0000000] cpu0: 48 TLB entries, 16MB max page size
[   1.0000000] cpu0: 16KB/16B direct-mapped L1 instruction cache
[   1.0000000] cpu0: 16KB/16B direct-mapped write-back L1 data cache
[   1.0000000] cpu0: 2048KB/128B direct-mapped write-back L2 unified cache
[   1.0000000] int0 at mainbus0 addr 0x1fbd9880

The address in the last line is for Indy, not for Indigo2. My understanding
is that device ioc0 that sets the variable "mach_subtype" should be probed
before device int0 and some other devices that use the variable
"mach_subtype".

Did I forget to set device ioc0 to be preferentially probed?

Best Regards,
-- 
Yoshihiko Iwama