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System Initialization and Acceptance Testing (Normal Operation)
4.2 Power-On Self-Tests (POST)
Table 4–2 LED Codes
LED
Value
Actions
F
Initial state on power-up, no code has executed
E
Entered ROM space, some instructions have executed
D
Waiting for power to stabilize (POK)
C
SSC RAM, SSC registers, and ROM checksum tests
B
O-bit memory, interval timer, and virtual mode tests
A
FPA tests
9
Backup cache, primary cache, and memory tests
8
NMC, NCA, memory, and I/O interaction tests
7
CQBIC (Q22–bus) tests
6
Console loopback tests
5
SHAC DSSI subsystem tests
4
SGEC Ethernet subsystem tests
3
"Console I/O" mode
2
Control passed to VMB
1
Control passed to secondary bootstrap
0
"Program I/O" mode, control passed to operating system
4–6 System Initialization and Acceptance Testing (Normal Operation)