[c-nsp] IOS version conflict with NPE200 after upgrading to 12.3(21)

[Andreas S. Kerber]

We've upgraded one our routers from 12.3(19) to 12.3(21). Since that, "show version"
says that this IOS is not supported on NPE200. Has anybody seen this before? 
There's no other visible impact due to this IOS update.

kempten13>sh ver
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-IS-M), Version 12.3(21), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by cisco Systems, Inc.
Compiled Mon 06-Nov-06 16:25 by ccai
Image text-base: 0x60008AF4, data-base: 0x61D42000

ROM: System Bootstrap, Version 11.1(13)CA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(5)T,  RELEASE SOFTWARE (fc1)

kempten13 uptime is 19 hours, 52 minutes
System returned to ROM by reload at 14:32:12 UTC Wed Jan 24 2007
System image file is "slot0:c7200-is-mz.123-21.bin"
Last reload reason: Reload command


cisco 7204 (NPE200) processor (revision B) with 114688K/16384K bytes of memory.
Processor board ID 16075510
R5000 CPU at 200MHz, Implementation 35, Rev 2.1, 512KB L2 Cache
4 slot midplane, Version 1.0

Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.

--------------------------------------------------------------
This Version of Cisco IOS Software is not supported on NPE200.
Please select a version of Cisco IOS software compatible with
this processor from http://www.cisco.com.
--------------------------------------------------------------

Number of Fast PAs = 2
Number of Fast+Medium PAs = 2
Total number of PA bandwidth points consumed = 400
Please refer to the following document "Cisco 7200 Series Port Adaptor
Hardware Configuration Guidelines" on Cisco.com <http://www.cisco.com>
for c7200 bandwidth points oversubscription and usage guidelines.

2 FastEthernet/IEEE 802.3 interface(s)
125K bytes of non-volatile configuration memory.
4096K bytes of packet SRAM memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102

kempten13>