rd(4) HP-IB disks emulated by the HPDrive emulator

FYI,

Today I've just tried the "HPdrive" HP-IB device emulator
 https://www.hp9845.net/9845/projects/hpdrive/
with National Instruments PCI-GPIB (TNT5004) board on
NetBSD/hp300 9.1 and hp425t, and it's recognized properly
and just works!

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NetBSD 9.1 (GENERIC) #0: Sun Oct 18 19:24:30 UTC 2020
	[email protected]:/usr/src/sys/arch/hp300/compile/GENERIC
HP 9000/425t (25MHz MC68040 CPU+MMU+FPU, 4k on-chip physical I/D caches)
total memory = 49140 KB
avail memory = 43532 KB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
mainbus0 (root)
intio0 at mainbus0
rtc0 at intio0 addr 0x420000
frodo0 at intio0 addr 0x41c000 ipl 5
dnkbd0 at frodo0 offset 0x0: no keyboard
com1 at frodo0 offset 0x40: ns8250 or ns16450, no fifo
com2 at frodo0 offset 0x60: ns8250 or ns16450, no fifo
hil0 at intio0 addr 0x428000 ipl 1
nhpib1 at intio0 addr 0x478000 ipl 3: internal HP-IB
hpibbus1 at nhpib1
rd0 at hpibbus1 slave 0 punit 0: 7937H
rd0: 698 cylinders, 13 heads, 1116102 blocks, 512 bytes/block

 [snip]

RAIDframe: can't get disk size for dev rd0 (22)
boot device: rd0
root on rd0a dumps on rd0b
root file system type: ffs
kern.module.path=/stand/hp300/9.1/modules
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See also:
 https://twitter.com/tsutsuii/status/1347613977124114432
 https://twitter.com/tsutsuii/status/1347634194558586882

Note newfs(8) and fsck(8) etc. in NetBSD 9.1 have a bug that
causes SIGSEGV on accessing disks without DIOCGDISKINFO ioctl
(including rd(4)), while it has already been fixed in -current:
 http://www.nerv.org/netbsd/?q=id:20190928T180319Z

I'll send a pullup request for this soon.

Have fun,
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Izumi Tsutsui