AlphaServer GS60/140 and 8200/8400 Release Notes 3
System Configuration Cautions
KFE70 Standard I/O Module
The network, keyboard, and mouse connections on the KFE70 standard I/O module are not
supported.
For graphics systems requiring keyboard and mouse support, the KFE72 can be used.
Handling of PAL Mode Halts
If the system halts with either a double-error halt or a machine check while in PAL mode, you
can get information on the halt condition.
Two AlphaServer 8200/8400 halt conditions require special consideration:
• Double-error halt, halt code 06
• Machine check while in PAL mode halt, halt code 07
A double-error halt occurs when a subsequent machine check occurs while a machine check is in
progress. A machine check while in PAL mode halt occurs when a CPU experiences a machine
check while executing in PAL mode. Following either of these events, continued system operation
is not possible. And since the hardware error state cannot be collected through normal
mechanisms, there may be no related system error log entry or operating system memory dump file.
As a result of this, the minimum hardware error state necessary to isolate the failure to its root
cause is captured by console and PAL firmware and stored in the CPU module’s nonvolatile
EEPROM (flashrom) halt area. Subsequently, during the diagnosis of a PAL mode halt, a show
eeprom halt SRM console command should be entered to retrieve this information. (This
command should be performed on each CPU module).
The AlphaServer 8200/8400 SRM console provides a nonvolatile area in each processor module’s
EEPROM for the storage of halt frames. A halt frame is built upon the occurrence of a CPU
double-error halt or machine check while in PAL mode halt. For console versions V4.8-6 and
earlier, the EEPROM halt area provides space for the storage of four frames per CPU; the first
four PAL mode halt events are saved. Once four frames have been saved, it will be necessary to
reinitialize the EEPROM halt area to enable the storage of subsequent events. This may be
accomplished through the console clear eeprom halt command. Due to halt frame enhancements,
console versions V4.9-20 and later provide space for the storage of only two frames per CPU; the
first two occurrences are saved. The halt frame is timestamped with the contents of the CPU
Watch Chip TOY Clock registers. On OpenVMS systems, the TOY Clock Year Register contains
the year, in hex, since 1900 while, on Tru64 UNIX systems, this register contains the year since
1952. Additionally, it should be realized that since the primary CPU is used to maintain the system
time, the watch chip registers on secondary CPU modules may not contain the accurate time of
year. Therefore, the timestamp contained within the halt frame for a secondary CPU should NOT
be used to determine the time of occurrence.
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