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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:
AB O Off O G Prepare BBS in Int 19 boot.
AC O G R Off End of POST initialization of chipset registers.
B1 R Off R O Save system context for ACPI.
00 Off Off Off Off Pass control to OS Loader (typically INT19h).
61-70 - - - - 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.
Check
point Diagnostic LED decoder
G=Green, R=Red, O=Orange Description
Before
D1h R R Off O Early chipset initialization is done. Early super I/O initialization
is done, including RTC and keyboard controller, NMI is disabled.
D1 R R Off O Perform keyboard controller BAT test. Check if waking up from
power management suspend state. Save power-on CPUID value
in scratch CMOS.
D0 R R Off R Go to flat mode with 4 GB limit and GA20 enabled. Verify the
bootblock checksum.
D2 R R G R Disable CACHE before memory detection. Execute full memory
sizing module. Verify that flat mode is enabled.
D3 R R 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.
D4 R O Off R Test base 512 KB memory. Adjust policies and cache first 8 MB.
Set stack
D5 R O Off O Bootblock code is copied from ROM to lower system memory and
control is given to it. BIOS now executes out of RAM.
Check
point Diagnostic LED decoder
G=Green, R=Red, O=Orange Description