Machine Check 620 Error - Compaq AlphaServer GS60E Service Manual

4.5.2

Machine Check 620 Error

Machine check 620 errors are nearly always soft errors; that is, they do
not cause the system to crash. Correctable write data errors (CWDE)
on CSR writes are the exception.
Example 4-6 shows a sample machine check 620 error. In this case, all nodes on
the TLSB are presented in the error log entry. The steps in Table 4-4 isolate
the error and the FRU most likely responsible.
Table 4–4 Parsing a Sample 620 Error (Example 4-6)
–
This line identifies the error log entry as a machine check 620 error.
—
The parse tree for machine check 620 errors starts with the DC_STAT
register. The next branch on the parse tree is C_STAT.
DSTREAM_MEM_ERR is set.
˜
The TLBER register is next in the parse tree. CORRECTABLE READ
DATA ERROR is set.
™
The TLBER register on the memory module is next in the parse tree.
CORRECTABLE READ DATA ERROR is set.
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The error log identifies the SIMM where the error occurred as J22. UNIX
lists each occurrence of a corrected read data error. Before replacing the
SIMM, you would probably want to examine other 620 entries to see if the
error on SIMM J22 was repeated.
Example 4-6 Sample Machine Check 620 Error Log Entry
**** T3.1 ****** ENTRY
Logging OS
System Architecture
Event sequence number
Timestamp of occurrence
Host name
System type register
Number of CPUs (mpnum)
CPU logging event (mperr) x00000002
1 ***********************
2. Digital UNIX
2. Alpha
2.
15-JUN-1999 20:05:32
warp5
x0000000C AlphaServer 8x00
x00000004
DECevent Error Log 4-17