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Cisco Aironet 1260 Series

Field Notice: FN - 63537 - AP3500/AP1260 - Boot Issues - Upgrade Required

Field Notice: FN - 63537 - AP3500/AP1260 - Boot Issues - Upgrade Required

Revised September 25, 2012


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Date Comment
1.2
25-SEP-2012
Updated Workaround/Solution section.
1.1
13-SEP-2012
Updated Workaround/Solution section.
1.0
06-AUG-2012
Initial Public Release

Products Affected

Products Affected Version ID
AIR-AP126n    V01 
AIR-LAP126n    V01 
AIR-LAP126n-x-K9  V01 
AIR-CAP35nn    V01 

Problem Description

Calibration between DRAM and processor on AIR-CAP350x and AIR-LAP126x results in Access Points (APs) failing to boot properly. One symptom includes a white LED and no console output.

Background

The root cause is the DDR memory calibration process that was performed on the Access Points (APs) at the time of manufacture. The fix recalibrates the existing memory hardware, so it will operate more reliably.

Problem Symptoms

  • The Access Point (AP) may be unable to boot. When power is applied, the LED shows as white and no console output is seen. 
  • The AP may reboot randomly with:
System returned to ROM by watchdog timer expired
Last reset from watchdog timer expired
  • The AP may crash with a message in crashinfo similar to one of the following:
Unexpected exception to CPUvector 700, PC = 0x5F784 ,
LR= 0x1A5524           

Traceback= 0x5F784 0x1A5524 0x1A56F0 0x177AE4 0x276F88
0x1A5A70
Unexpected exception to CPUvector 200, PC = 0x237CB0 ,
LR = 0x237C94

Traceback= 0x237CB0 0x237D18 0x1F2824 0x51CC30 0x51B898
0x508E5C 0x511794
0x511B7C 0x503B44 0x51C49C 0x51CB30 0x526378 0x530184
0x52FD0C 0x5DA6AC 0x584C4C
reset_interrupt_level: reverse reset level current level
4 new level 1174028828
%Software-forced reload
Unexpected exception to CPUvector 700, PC = 0x1A19C8 ,
LR = 0x1A1918

Traceback= 0x1A19C8 0x1A1918 0x5DEB84 0x5DEEA4 0x5DEF54
0x5DF0CC 0x1A5A70 

The value of Traceback may be changed from time to time.

Workaround/Solution

The fix for this issue is now publicly available. Go to www.cisco.com to obtain Access Point (AP) IOS code version: 15.2(2)JA or later and/or WLC software version: 7.0.235.3 (or later 7.0 release), 7.2.111.3 (or later 7.2 release) or 7.3.101.0 (or later 7.3 release).

As of June 2012, new AP3500 and AP1260 products with version ID (VID) V02 are free of this issue. Refer to How to Identify Hardware Levels below for instructions on how to view the version and deviation of in-service products.

For more information, see the following article: Calibration fix for 1260, 3500 series APs (CSCtu24972, CSCty68030)

How To Identify Hardware Levels

This problem may affect any 1260 and 3500 series Access Point (AP) for which all of the following conditions are true:

  • Version ID (VID) is V01 (verify via visual inspection or via the AP command show inventory).
  • Bootloader has not been upgraded (verify via the AP command show version | include BOOTLDR; the upgrade is required if the output displays "Version 12.4(23c)JA"). 

In the AP CLI, use the show inventory command; for example:

AP#show inventory
  NAME: "AP3500", DESCR: "Cisco Aironet 3500 Series (IEEE 
  802.11n) Access Point"
  PID: AIR-CAP3502E-A-K9 , VID: V01, SN: FTXnnnnnnnn

This image shows how to identify the VID via visual inspection:

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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