Intel SR1640TH Service Guide - Page 89

Pre-EFI Initialization PEI Core, Driver Execution Environment DXE Core, DXE Drivers

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Table 10. Diagnostic LED POST Code Decoder Diagnostic LED Decoder Checkpoint O = On, X = Off Description Upper Nibble Lower Nibble MSB LSB 8h 4h 2h 1h 8h 4h 2h 1h LED 0xD4 #7 #6 #5 #4 O O X O 0xD5 O O X O 0xD6 O O X O 0xDF O O X O Pre-EFI Initialization (PEI) Core 0xE0h O O O X 0xE1h O O O X 0xE2h O O O X 0xE3h O O O X Driver Execution Environment (DXE) Core 0xE4h O O O X 0xE5h O O O X 0xE6h O DXE Drivers 0xE7 O 0xE8 O 0xE9 O 0xEA O O O X O O X O O X O O X O O X #3 #2 #1 #0 X O X X Attempt flash update boot mode X O X O Transfer control to EFI boot X O O X Trying to boot device selection O O O O Reserved for boot device selection O X X X Entered Pre-EFI Initialization phase (PEI) X X X O Started dispatching early initialization modules (PEIM) X X O X Initial memory found, configured, and installed correctly X X O O Transfer control to the DXE Core O X X X Entered EFI driver execution phase (DXE) O X X O Started dispatching drivers O X O X Started connecting drivers X O O O Waiting for user input O X X X Checking password O X X O Entering BIOS setup O X O X Flash Update Intel® Server System SR1640TH Service Guide 73

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Intel
®
Server System SR1640TH Service Guide
73
0xD4
O
O
X
O
X
O
X
X
Attempt flash update boot
mode
0xD5
O
O
X
O
X
O
X
O
Transfer control to EFI
boot
0xD6
O
O
X
O
X
O
O
X
Trying to boot device
selection
0xDF
O
O
X
O
O
O
O
O
Reserved for boot device
selection
Pre-EFI Initialization (PEI) Core
0xE0h
O
O
O
X
O
X
X
X
Entered Pre-EFI
Initialization phase (PEI)
0xE1h
O
O
O
X
X
X
X
O
Started dispatching early
initialization modules
(PEIM)
0xE2h
O
O
O
X
X
X
O
X
Initial memory found,
configured, and installed
correctly
0xE3h
O
O
O
X
X
X
O
O
Transfer control to the
DXE Core
Driver Execution Environment (DXE) Core
0xE4h
O
O
O
X
O
X
X
X
Entered EFI driver
execution phase (DXE)
0xE5h
O
O
O
X
O
X
X
O
Started dispatching
drivers
0xE6h
O
O
O
X
O
X
O
X
Started connecting drivers
DXE Drivers
0xE7
O
O
O
X
X
O
O
O
Waiting for user input
0xE8
O
O
O
X
O
X
X
X
Checking password
0xE9
O
O
O
X
O
X
X
O
Entering BIOS setup
0xEA
O
O
O
X
O
X
O
X
Flash Update
Table 10. Diagnostic LED POST Code Decoder
Diagnostic LED Decoder
Checkpoint
O = On, X = Off
Description
Upper Nibble
Lower Nibble
MSB
LSB
8h
4h
2h
1h
8h
4h
2h
1h
LED
#7
#6
#5
#4
#3
#2
#1
#0