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Check
Diagnostic LED decoder
point
G=Green, R=Red, O=Orange
A8
O
Off
A9
O
Off
AA
O
Off
AB
O
Off
AC
O
G
B1
R
Off
00
Off
Off
61-70
-
-
Bootblock initialization code checkpoints
The Bootblock initialization code sets up the chipset, memory, and other components
before system memory is available. The following table provides the diagnostic LED code
for these checkpoints and describes the type of checkpoints that may occur during the
bootblock initialization:
Check
Diagnostic LED decoder
point
G=Green, R=Red, O=Orange
Before
R
R
D1h
D1
R
R
D0
R
R
D2
R
R
D3
R
R
D4
R
O
Description
R
Off
Prepare CPU for operating system boot, including final MTRR
values.
R
G
Wait for user input at config display, if needed.
O
Off
Uninstall POST INT1Ch vector and INT09h vector. De-initializes
the ADM module.
O
G
Prepare BBS in Int 19 boot.
R
Off
End of POST initialization of chipset registers.
R
O
Save system context for ACPI.
Off
Off
Pass control to OS Loader (typically INT19h).
-
-
OEM POST Error. This range is reserved for chipset vendors and
system manufacturers. The error associated with this value may
be different from one platform to the next.
Description
Off
O
Early chipset initialization is done. Early super I/O initialization
is done, including RTC and keyboard controller, NMI is disabled.
Off
O
Perform keyboard controller BAT test. Check if waking up from
power management suspend state. Save power-on CPUID value
in scratch CMOS.
Off
R
Go to flat mode with 4 GB limit and GA20 enabled. Verify the
bootblock checksum.
G
R
Disable CACHE before memory detection. Execute full memory
sizing module. Verify that flat mode is enabled.
G
O
If memory sizing module not executed, start memory refresh and
do memory sizing in Bootblock code. Do additional chipset
initialization. Re-enable CACHE. Verify that flat mode is enabled.
Off
R
Test base 512 KB memory. Adjust policies and cache first 8 MB.
Set stack
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Troubleshooting
