Error Logs 4-11
4.3
Error Log Examples and Analysis
The following sections provide examples and analysis of error logs.
4.3.1
MCHK 670 CPU-Detected Failure
The error log in Example 4–1 shows the following:
²
CPU1 logged the error in a system with two CPUs.
³
During a D-ref fill, the External Interface Status Register logged an
uncorrectable EEC error. (When a CPU chip does not find data it needs to
perform a task in any of its caches, it requests data from off the chip to fill
its D-caches. It performs a “D-ref fill.”) Bit<30> is clear, indicating that
the source of the error is the B-cache.
´
Neither IOD CAP Error Register saw an error.
The error was detected by a CPU and the data was not on the system bus.
Otherwise, the IODs would have seen the error. Therefore, CPU1 is broken.
NOTE: The error log example has been edited to decrease its size; registers of
interest are in bold type. The “MC” bus is the system bus.
Refer to Table 4-9 for information on decoding commands, and refer to Table 4-10
for information on node IDs.
