I
Error Messages
The error messages issued by the KA681/KA691/KA692/KA694 firmware fall
into three categories: halt code messages, VMB error messages, and console
messages.
I.1 Machine Check Register Dump
Some error conditions, such as machine check, generate an error summary
register dump preceding the error message. For example, examining a
nonexistent memory location results in the following display.
>>>ex /p/l 7fffff0
! Examine non-existent memory.
MESR=801FF000
MEAR=11FFFFF9
MMCDSR=01111000
MOAMR=00000000
CESR=00000000
CMCDSR=0000C108
CSEAR1=00000000
CSEAR2=00000000
CIOEAR1=010FC000 CIOEAR2=000002C0
CNEAR=00000000
ICSR=00000001
PCSTS=FFFFF800
PCADR=FFFFFFF8
TBSTS=C00000E0
TBADR=00000000
NESTS=00000000
NEOADR=E014066C
NEOCMD=8000F005
NEICMD=00000000
NEDATHI=00000000 NEDATLO=00000000
CEFSTS=0000022A
CEFADR=07FFFFF0
BCETSTS=00000000 BCETIDX=00000000
BCETAG=00000000
BCEDSTS=00000700
BCEDIDX=00000008 BCEDECC=00000000
CBTCR=00004000
DSER=00000000
QBEAR=0000000F
DEAR=00000000
IPCR0=0000
ECR=000000CA
?7D MACHINE CHECK
80060000 00000000 20047ECC 20047EBD 20047EB9 B0110080
>>>
I.2 Halt Code Messages
Except on power-up, which is not treated as an error condition, the following
halt messages are issued by the firmware whenever the processor halts
(Table I–1).
For example, if the processor encounters a HALT instruction while in kernel
mode, the processor halts and the firmware displays the following before
entering console I/O mode.
Error Messages I–1
