Vax V-041HS Service Manual download pdf (Page 151)

4.8 <REFERENCE>(XRP) Self-Test Results: XGPR

When a <REFERENCE>(XRP) failure occurs during power-

up and the failing test number cannot be found in the

module LEDs and RBDs cannot be run, you can examine

the XGPR register. The failing test number is left

in the upper byte of the XGPR register of the failing

<REFERENCE>(XRP) processor or of the boot processor if

a memory or DWMBB module fails.

Example 4–3: XGPR Register After Power-Up Test Failure

>>> E/P/L 2190000C ! Examine the longword at physical address

! 2190000C, the address of the XGPR

2190000C 30xxxxxx ! register of the <REFERENCE>(XRP) processor in slot 2.

! The result indicates that test 30 of the

! <REFERENCE>(XRP) self-test failed. See Table 4-4

! to interpret the data returned.

>>> E/P/L 2188000C ! Examine the XGPR register of the <REFERENCE>(XRP)

! processor in slot 1. Derivation of the

! address is explained below.

2188000C 49xxxxxx ! CPU/memory interaction test 12 failed.

>>> E/P/L 2188000C ! Examine the XGPR register of the boot

! processor, which is in slot 1.

2188000C A0xxxxxx ! Disregard bit <31> (which indicates a

! DWMBB test failure); the failing test

! number is 20.

When a failure occurs in power-up test, you can examine the XGPR

the <REFERENCE>(XRP) processor that failed self-test or CPU/memory

interaction test, or of the boot processor if DWMBB test failed, contains the

failing test number. If all power-up tests pass, the XGPR register contains

other data and should be ignored.

To examine the XGPR register, ﬁrst see Table 4–3 to determine the base

address (BB) of the <REFERENCE>(XRP) processor’s node. Then calculate

the address of the XGPR register by adding 0C (hex) to the base address.

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Vax V-041HS Service Manual Page 151