What is "module 1095:646" and "pci option table"?

From: Gernot Salzer <salzer_at_logic.tuwien.ac.at>
Date: Fri, 04 Apr 97 14:23:48 +0200

Dear sys admins,

at boot time I get the following message on the console:
   Module 1095:646 not in pci option table, can't configure it.
Has anyone a clue what this means?

It doesn't look like a severe error since the machine runs fine.

Thanks for any hint,
   Gernot Salzer

P.S.: Here are the first boot messages (by vmunix) as logged in
      /var/adm/messages (the module message appears as the ninth line)

Alpha boot: available memory from 0x828000 to 0x7f16000
Digital UNIX V4.0A (Rev. 464); Thu Apr 3 14:00:49 MET DST 1997
physical memory = 128.00 megabytes.
available memory = 119.29 megabytes.
using 482 buffers containing 3.76 megabytes of memory
Digital AlphaPC 164 500 MHz system
Firmware revision: 4.5
Digital UNIX PALcode version 1.21
Module 1095:646 not in pci option table, can't configure it
pci0 at nexus
trio0 at pci0 slot 6
trio0: S3 Trio64 (SVGA) - Plug N' Play - 2.0 Mb
tu0: DECchip 21040-AA: Revision: 2.3
tu0 at pci0 slot 7
tu0: DEC TULIP Ethernet Interface, hardware address: 00-C0-95-EC-B7-60
tu0: console mode: selecting 10Base5 (AUI) port
Received on Fri Apr 04 1997 - 14:49:55 NZST

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