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Table 8–2 Post Codes
Source
AlphaBIOS 98
Fail-safe
booter
8.5 Fail-Safe Booter
The fail-safe booter provides an emergency recovery mechanism when the primary
firmware image contained in flash memory has been corrupted. When flash memory
has been corrupted, and no image can be loaded safely from the flash, you can run
the fail-safe booter and boot another image from a diskette that is capable of repro-
gramming the flash.
Starting the Fail-Safe Booter
You can start the fail-safe booter in one of two ways:
•
If the primary firmware image is unavailable when the system is powered on or
reset, the fail-safe booter runs automatically. When the fail-safe booter runs, the
system emits a series of beeps through the speaker as beep code 1-2-3; that is,
one beep and a pause, followed by two beeps and a pause, followed by three
beeps. After the diskette activity light flashes, insert the AlphaPC 164LX
AlphaBIOS Firmware diskette. The fail-safe booter will load and run
AlphaBIOS from this diskette. Proceed to Section 7.1.3 and follow the procedure
for updating your flash ROM.
Post Code
(hex)
Description
17
System ROM loaded to memory
18
Icache flush code written to memory
19
CPU errors cleared; jump to system code
20
ISA bus reset
3F
Fatal error. Second code identifies source of error:
05 = No memory found
06 = Checksum error detected when image was read back from
memory
Firmware has control
97
Buses initialized
95
Video console opened
51
FATAL - returned from boot menu selection
50
FATAL - firmware fatal error
42
Firmware drivers have been started
00
Firmware has been initialized
BF
Fail-safe booter startup
Fail-Safe Booter
(Sheet 2 of 2)
Troubleshooting
8–3
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