Acer G520 series manual Diagnostic LED Decoder

167

	Diagnostic LED Decoder
Check
	G=Green, R=Red, A+Amber				Description
point
	MSB			LSB
A2	R	OFF	A	OFF	Takes care of runtime
					image preparation for
					different BIOS modules.
					Fill the free area in F000h
					segment with 0FFh.
					Initializes the Microsoft
					IRQ Routing Table.
					Prepares the runtime
					language module.
					Disables the system
					configuration display if
					needed.
A4	R	G	R	OFF	Initialize runtime
					language module.
A7	R	G	A	G	Displays the system
					configuration screen if
					enabled. Initialize the
					CPU’s before boot, which
					includes the programming
					of the MTRR’s.
A8	A	OFF	R	OFF	Prepare CPU for operating
					system boot including
					final MTRR values.
A9	A	OFF	R	G	Wait for user input at
					config display if needed.
AA	A	OFF	A	OFF	Uninstall POST INT1Ch
					vector and INT09h vector.
					Deinitializes the ADM
					module.
AB	A	OFF	A	G	Prepare BBS for Int 19
					boot.
AC	A	G	R	A	End of POST initialization
					of chipset registers.