Boot Block Initialization Code Checkpoints; Table 68. Boot Block Initialization Code Checkpoints - Intel SE7520BD2 Technical Product Specification

Error Reporting and Handling
Diagnostic LED Decoder
Checkpoint
G=Green, R=Red, A=Amber
MSB
AC A G
B1 R OFF
00 OFF OFF
5.4.5

Boot Block Initialization Code Checkpoints

The boot block initialization code sets up the chipset, memory and other components before
system memory is available. The following table describes the type of checkpoints that may
occur during the boot block initialization portion of the BIOS.

Table 68. Boot block Initialization Code Checkpoints

Diagnostic LED Decoder
Checkpoint
G=Green, R=Red, A=Amber
MSB
Before D1
D1 R R
D0 R R
D2 R R
D3 R R
D4 R A
D5 R A
D6 R A
D7 R A
D8 A R
D9 A R
DA A R
130
Intel® Server Board SE7520BD2 Technical Product Specification
LSB
R OFF End of POST initialization of chipset registers.
R A Save system context for ACPI.
OFF OFF Passes control to OS Loader (typically INT19h).
LSB
Early chipset initialization is done. Early super I/O initialization is done
including RTC and keyboard controller. NMI is disabled.
Perform keyboard controller BAT test. Check if waking up from power
OFF A management suspend state. Save power-on CPUID value in scratch
CMOS.
Go to flat mode with 4GB limit and GA20 enabled. Verify the boot
OFF R
block checksum.
Disable CACHE before memory detection. Execute full memory sizing
G R
module. Verify that flat mode is enabled.
If memory sizing module not executed, start memory refresh and do
G A memory sizing in Boot block code. Do additional chipset initialization.
Re-enable CACHE. Verify that flat mode is enabled.
Test base 512KB memory. Adjust policies and cache first 8MB. Set
OFF R
stack.
Boot block code is copied from ROM to lower system memory and
OFF A
control is given to it. BIOS now executes out of RAM.
Both key sequence and OEM specific method is checked to
determine if BIOS recovery is forced. Main BIOS checksum is tested.
G R If BIOS recovery is necessary, control flows to checkpoint E0. See
Boot block Recovery Code Checkpoints section of document for more
information.
Restore CPUID value back into register. The Boot block-Runtime
G A interface module is moved to system memory and control is given to
it. Determine whether to execute serial flash.
The Runtime module is uncompressed into memory. CPUID
OFF R
information is stored in memory.
Store the Uncompressed pointer for future use in PMM. Copying Main
OFF A BIOS into memory. Leaves all RAM below 1MB Read-Write including
E000 and F000 shadow areas but closing SMRAM.
Restore CPUID value back into register. Give control to BIOS POST
G R (ExecutePOSTKernel). See POST Code Checkpoints section of
document for more information.
Description
Description
Revision 1.3