Gateway 9315 Bootblock initialization code checkpoints

Check	Diagnostic LED decoder				Description
point	G=Green, R=Red, O=Orange
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.

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 codes for these checkpoints and describes the type of checkpoints that may occur during the bootblock initialization:

Check	Diagnostic LED decoder				Description
point	G=Green, R=Red, O=Orange
Before	R	R	Off	O	Early chipset initialization is done. Early super I/O initialization
D1					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.

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