Re: VAXstation 3100/30 KA420 SCSI DMA problem on netboot (and fix)

[Ken Wellsch <kwellsch%tampabay.rr.com@localhost>]

On Sun, Feb 18, 2024 at 03:39:18AM +0900, Izumi Tsutsui wrote:
> mcguire@ wrote:
> 
> > On 2/17/24 04:19, Anders Magnusson wrote:
> > > About the /m76, no idea.  We leave it for now until someone with that 
> > > hardware can test if it is needed.
> > 
> >    If anyone is stuck on this, I can try to dig out one of my M76 
> > machines and get it running.  Let me know.
> 
> Ok, if you can try netboot (via mopd(8) etc.) on your M76,
>  http://www.netbsd.org/docs/network/netboot/intro.vax.html
> could you try to boot the following debug kernel to check a
> region around KA420_STC_MODE?

Unfortunately the ethernet media switch is broken on my M76.  I am sure
Dave is much better set to carry on both disk and ethernet boots.  I will
see what I can do to fix the switch if I can.

So, for what it is worth, this is a disk boot (an install CD image I built
with your patch, served from a SCSI emulator card):

>>> boot DKA500

	...

[   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
[   1.0000000]     2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
[   1.0000000]     2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023,
[   1.0000000]     2024
[   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 10.0_RC4 (GENERIC) #1: Sun Feb 18 08:51:17 EST 2024
[   1.0000000] 	netbsd@z440d:/home/netbsd/obj.vax/sys/arch/vax/compile/GENERIC
[   1.0000000] VAXstation 3100/m76

	...

[   1.0000000] si0 at vsbus0 csr 0x200c0080 vec 770 ipl 17 maskbit 1
[   1.0000000] Dumping KA420_SCD region
[   1.0000000] 0x200C00A0: 00 08 00 00 FF FF FF FF FF FF FF FF FF FF FF FF
[   1.0000000] 0x200C00B0: 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF
[   1.0000000] 0x200C00C0: 00 00 00 00 01 00 00 00 FF FF FF FF FF FF FF FF
[   1.0000000] 0x200C00D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
[   1.0000000] 0x200C00E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
[   1.0000000] 0x200C00F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
[   1.0000000] si0: NCR5380, SCSI ID 6
[   1.0000000] scsibus0 at si0: 8 targets, 8 luns per target