Alpha 1000A Installation Manual download pdf (Page 27)

AlphaServer 1000/1000A CPU Upgrade Guide 5–1

Downgrading Your System

This chapter explains how to downgrade your system from an 5/xxx system to a 4/xxx

system.

The downgrade procedure is only used if you have not been successful in implementing

the upgrade or if you wish to return to a previous configuration.

Procedure

The procedure for downgrading the system to a 4/xxx system follows the procedure

detailed in Chapter 3, only steps 3 and 5 are revised to remove the performance-enhanced

CPU (5/xxx) and replace it with the 4/xxx CPU. The 4/xxx firmware is also restored.

Note: Before beginning the downgrade procedure, make sure the systems ECC memory is

installed. The ECC memory, which is not used by 5/xxx systems, is required for 4/xxx

systems.

When downgrading to the 4/xxx CPU and firmware, follow the steps in Chapter 3, only

steps 3 and 5 are revised as outlined below:

In step 3, remove the performance-enhanced CPU and install the 4/xxx CPU. Set the J1

jumper on the 4/xxx CPU to the fail-safe loader setting (bank 7).

In step 5, install the appropriate 4/xxx console firmware into the floppy drive: AxpServ

1000A 4/xxx (AK-QYTAA-CA) for AlphaServer 1000A systems; AxpServ 1000 4/xxx

(AK-QYTB-CA) for AlphaServer 1000 systems.

When you enter the update command through the loadable firmware update utility, the

utility will note that the update revision number is less than the current revision of the

console firmware. Enter Y to “update” the firmware with the old version (4/xxx) of the

console firmware.

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Alpha 1000A Installation Manual Page 27