Appendix C Power-Up Tests, LED Patterns

APPENDIX C: Power-Up Tests

Appendix C: Power-Up Tests

When you power up the server, it goes through the power-up diagnostics. These diagnostics first blink the LEDs to indicate that the processor can execute firmware correctly and that you can individually address the LEDs.

It then tests RAM, the serial channels, and the Ethernet controller. After this, it checksums the NVR (non-volatile RAM) to verify that the saved data, including its Ethernet address, has not been corrupted. If the checksum test fails, the EPS sets the Ethernet address to 00-00-00-00-00-00 (which is a known invalid address) and resets other server parameters to factory-default values, and calculates a new checksum.

After the EPS completes power-up diagnostics, it will attempt to boot.

If the installed Ethernet address is not valid, as in the case above, the server will enter the boot monitor.

C.1 Connections and Termination

To successfully complete power-up diagnostics, you must have a valid network connection. If you are using the AUI port, you must connect it to a properly terminated transceiver or an AUI cable connected to a thickwire tap.. If you are using 10BASE-T, you must connect the port to a 10BASE-T hub or another host. A faulty transceiver or improperly terminated Ethernet may interfere with the server’s power-up diagnostics. At power-up time, the server does not care if there are any devices connected to the serial or parallel ports; however, if it detects errors, it will attempt to report the problem to a device connected to the serial port.

C.2 LED Patterns

As power-up tests progress, the EPS will output testing status to the LEDs in the following sequence (although they may change too quickly to observer when the tests pass). If a pattern is continuous, then the diagnostics have detected an error during that test. When the EPS detects an error, it writes the error code to the LEDs and then attempts to write a failure message out of port 1 at 9600 baud, 8 bits, no parity, to notify the user. Depending on the nature of the error, this may not be possible. In each of the situations described below, the four LEDs are shown in Table C-1 as being on (•) or off (-).

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