VAXServer 3100 firmware requests unsupported ModeSense page 37 (0x25)

[kkaempf]

Info

• Which version of Pi are you using: 3
• Which github revision of software: HEAD of develop
• Which board version: 2.3B
• Which computer is the PiSCSI connected to: DEC VAXServer 3100 (KA41E V1.0)
• Which OS you are using (output of 'lsb_release -a'): Debian 11 (bullseye)

Describe the issue

DEC's firmware, when scanning for SCSI devices, requests page 37 (0x25) via ModeSense6, which is unsupported.
The SCSI disk is not recognized as a result.

Since it works in simh I should be able to figure out how to fix it 🤞🏻

[kkaempf]

using sgmode (from scsirastools) I was able to capture the following:

open /dev/sda with flags=0x800
    inquiry cdb: [12 00 00 00 24 00]
      duration=4 ms
    mode sense(6) cdb: [1a 00 25 00 fc 00]
      duration=4 ms
    mode sense(6): pass-through requested 252 bytes (data-in), got 37 bytes
    mode sense(6): response:
24 00 00 08 00 06 40 c0  00 00 02 00 a5 17 01 00
00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
00 00 00 00 00
    DEC       RZ24     (C) DEC  211B   peripheral_type: disk [0x0]
Mode parameter header from MODE SENSE(6):
 00     24 00 00 08                                         $...
  Mode data length=37, medium type=0x00, WP=0, CAPPID=0, DpoFua=0, longlba=0
  Block descriptor length=8
> Direct access device block descriptors:
   Density code=0x0
 00     00 06 40 c0 00 00 02 00                             ..@.....

>> page_code: 0x25, page_control: current
 00     a5 17 01 00 00 00 00 00  00 00 00 00 00 00 00 00    ................
 10     00 00 00 00 00 00 00 00  00                         .........