A64 option rom by TicTac

gistfile1.txt

;---------------------------------------------------------------------
; tictac A64 Bios Tweaker Rev 001 Alpha
;---------------------------------------------------------------------
.486p

CSEG	SEGMENT PARA PUBLIC USE16 'CODE'
	ASSUME CS:CSEG
	ORG 0

;---------------------------------------------------------------------
; Expansion PCI ROM Header
;---------------------------------------------------------------------
	
	db  55h   			; Rom signature byte 1
    	db  0AAh  			; Rom signature byte 2
	db  01h   			; Rom Size (1bit = 512 bytes)

	jmp INIT  			;jump to initialization
    	
;---------------------------------------------------------------------
; Address & Data Port
;---------------------------------------------------------------------

	address		equ 0CF8h	; Access to configuration address
	data		equ 0CFCh	; Access to configuration data
	
	
;---------------------------------------------------------------------
; PCI Bus, Device, Function, Register
;---------------------------------------------------------------------
; _________________________________________________________________	
; |	28|	24|	20|	16|	12|	 8|	 4|	 0| Bits Number
; |1 0 0 0|0 0 0 0|0 0 0 0 0 0 0 0|0 0 0 0|0 0 0 0|0 0 0 0|0 0 0 0| Bits
; |1 - - -|- - - -|  Bus Number   | Device  |Func |Reg        |- -| Definition
; |1 0 0 0|0 0 0 0|0 0 0 0 0 0 0 0|1 1 0 0 0|0 1 0|0 0 0 0 0 0|0 0| Bits
; |   8   |   0   |   0       0   |   24    |  2  |           | 0 | Decimal
; |   8   |   0   |   0       0   |   C   |    2  |       |       | Hex
; |_______________________________________________________________|	

	dtl_add   	equ 08000C288h ; DRAM Timing Low
	dth_add		equ 08000C28Ch	; DRAM Timing High
	dcl_add		equ 08000C290h	; DRAM Configuration Low
	dch_add		equ 08000C294h	; DRAM Configuration High
	ddr_add		equ 08000C298h	; DRAM Delay Line Register
	
	
;---------------------------------------------------------------------
; DRAM Timing Low Address
;---------------------------------------------------------------------
; CAS Latency(dtl)
	tcl_data    	equ 0FFFFFFF8h	; CAS Latency (3bit)
	tcl_2		equ 000000001h	; CAS 2
	tcl_25		equ 000000005h	; CAS 2.5
	tcl_3		equ 000000002h	; CAS 3
	
; Row Cycle Time(dtl)
	trc_data	equ 0FFFFFF0Fh	; Row Cycle Time (4bit)
	trc_7		equ 000000000h	;
	trc_8		equ 000000010h	;
	trc_9		equ 000000020h	;
	trc_10		equ 000000030h	;
	trc_11		equ 000000040h	;
	trc_12		equ 000000050h	;
	trc_13		equ 000000060h	;
	trc_14		equ 000000070h	;
	trc_15		equ 000000080h	;
	trc_16		equ 000000090h	;
	trc_17		equ 0000000A0h	;
	trc_18		equ 0000000B0h	;
	trc_19		equ 0000000C0h	;
	trc_20		equ 0000000D0h	;
	trc_21		equ 0000000E0h	;
	trc_22		equ 0000000F0h	;
	
; Row Refresh Cycle Time(dtl)
	trfc_data	equ 0FFFFF0FFh	; Row Refresh Cycle Time (4bit)
	trfc_9		equ 000000000h	;
	trfc_10		equ 000000100h	;
	trfc_11		equ 000000200h	;
	trfc_12		equ 000000300h	;
	trfc_13		equ 000000400h	;
	trfc_14		equ 000000500h	;
	trfc_15		equ 000000600h	;
	trfc_16		equ 000000700h	;
	trfc_17		equ 000000800h	;
	trfc_18		equ 000000900h	;
	trfc_19		equ 000000A00h	;
	trfc_20		equ 000000B00h	;
	trfc_21		equ 000000C00h	;
	trfc_22		equ 000000D00h	;
	trfc_23		equ 000000E00h	;
	trfc_24		equ 000000F00h	;
	
; RAS to CAS Delay(dtl)
	trcd_data	equ 0FFFF8FFFh	; RAS to CAS Delay (3bit)
	trcd_2		equ 000002000h	; 2 clock
	trcd_3		equ 000003000h	; 3 clock
	trcd_4		equ 000004000h	; 4 clock
	trcd_5		equ 000005000h	; 5 clock
	trcd_6		equ 000006000h	; 6 clock

; RAS to RAS Delay(dtl)
	trrd_data	equ 0FFF8FFFFh	; RAS to RAS Delay (3bit)
	trrd_2		equ 000020000h	; 2 clock
	trrd_3		equ 000030000h	; 3 clock
	trrd_4		equ 000040000h	; 4 clock
	
; Min. RAS active time(dtl)
	tras_data	equ 0FF0FFFFFh	; Min. RAS active time (4bit)
	tras_5		equ 000500000h	; 5 clock
	tras_6		equ 000600000h	; 6 clock
	tras_7		equ 000700000h	; 7 clock
	tras_8		equ 000800000h	; 8 clock
	tras_9		equ 000900000h	; 9 clock
	tras_10		equ 000A00000h	; 10clock
	tras_11		equ 000B00000h	; 11clock
	tras_12		equ 000C00000h	; 12clock
	tras_13		equ 000D00000h	; 13clock
	tras_14		equ 000E00000h	; 14clock
	tras_15		equ 000F00000h	; 15clock
	
; Row Precharge Time(dtl)
	trp_data	equ 0F8FFFFFFh	; Row Precharge Time (3bit)
	trp_2		equ 002000000h	; 2 clock
	trp_3		equ 003000000h	; 3 clock
	trp_4		equ 004000000h	; 4 clock
	trp_5		equ 005000000h	; 5 clock
	trp_6		equ 006000000h	; 6 clock
	
; Write Recovery Time(dtl)
	twr_data	equ 0EFFFFFFFh	; Write Recovery Time (1bit)
	twr_2		equ 000000000h	; 2 clock
	twr_3		equ 010000000h	; 3 clock
	
	
;---------------------------------------------------------------------
; DRAM Timing High Address
;---------------------------------------------------------------------
; Write to read delay(dth)
	twtr_data    	equ 0FFFFFFFEh	; Write to read delay (1bit)
	twtr_1    	equ 000000001h	; 1 clock
	twtr_2    	equ 000000002h	; 2 clock
	
; Read to write delay(dth)
	trwt_data	equ 0FFFFFF8Fh	; Read to write delay (3bit)
	trwt_1		equ 000000000h	; 1 clock
	trwt_2		equ 000000010h	; 2 clock
	trwt_3		equ 000000020h	; 3 clock
	trwt_4		equ 000000030h	; 4 clock
	trwt_5		equ 000000040h	; 5 clock
	trwt_6		equ 000000050h	; 6 clock
	
; Refresh Rate(dth)
	tref_data	equ 0FFFFE0FFh	; Refresh Rate (5bit)
	tref_100_156	equ 000000000h	; 100MHz 15.6us
	tref_133_156	equ 000000100h	; 133MHz 15.6us
	tref_166_156	equ 000000200h	; 166MHz 15.6us
	tref_200_156	equ 000000300h	; 200MHz 15.6us
	tref_100_78	equ 000000800h	; 100MHz 7.8us
	tref_133_78	equ 000000900h	; 133MHz 7.8us
	tref_166_78	equ 000000A00h	; 166MHz 7.8us
	tref_200_78	equ 000000B00h	; 200MHz 7.8us
	tref_100_39	equ 000001000h	; 100MHz 3.9us
	tref_133_39	equ 000001100h	; 133MHz 3.9us
	tref_166_39	equ 000001200h	; 166MHz 3.9us
	tref_200_39	equ 000001300h	; 200MHz 3.9us
	
; Write CAS latency(dth)
	twcl_data	equ 0FF8FFFFFh	; Write CAS latency (3bit)
	twcl_1		equ 000000000h	; 1 clock
	twcl_2		equ 000100000h	; 2 clock


;---------------------------------------------------------------------
; DRAM Configuration Low Address
;---------------------------------------------------------------------
; DLL Disabled(dcl)
	dll_data	equ 0FFFFFFFEh	; DLL disabled (1bit)
	dll_enable	equ 000000000h	; Enabled(default)
	dll_disable	equ 000000001h	; Disabled
	
; Dimm Drive Strength(dcl)
	dds_data	equ 0FFFFFFFDh	; Dimm Drive Strength (1bit)
	dds_normal	equ 000000000h	; (Default)
	dds_weak	equ 000000002h	; (Beware)
	
; Read/Write Qued Bypass(dcl)
	rwqbp_data	equ 0FFFF3FFFh	; Read/Write Qued Bypass (2bit)
	rwqbp_2x	equ 000000000h	; 2x
	rwqbp_4x	equ 000004000h	; 4x
	rwqbp_8x	equ 000008000h	; 8x
	rwqbp_16x	equ 00000C000h	; 16x

; Bypass Max(dcl)
	bpm_data	equ 0F1FFFFFFh	; Bypass Max (3bit)
	bpm_0x		equ 000000000h	; 0x (Disabled)
	bpm_1x		equ 002000000h	; 1x
	bpm_2x		equ 004000000h	; 2x
	bpm_3x		equ 006000000h	; 3x
	bpm_4x		equ 008000000h	; 4x
	bpm_5x		equ 00A000000h	; 5x
	bpm_6x		equ 00C000000h	; 6x
	bpm_7x		equ 00E000000h	; 7x

; Command Rate(dcl)
	cr_data		equ 0EFFFFFFFh	; Command Rate (1bit)
	cr_1t		equ 000000000h	; 1T
	cr_2t		equ 010000000h	; 2T


;---------------------------------------------------------------------
; DRAM Configuration High Address
;---------------------------------------------------------------------
; Maximum Async Latency(dch)
	async_data    	equ 0FFFFFFF0h	; Maximum Async Latency (4bit)
	async_0    	equ 000000000h	; 0 ns
	async_1    	equ 000000001h	; 1 ns
	async_2    	equ 000000002h	; 2 ns
	async_3    	equ 000000003h	; 3 ns
	async_4    	equ 000000004h	; 4 ns
	async_5    	equ 000000005h	; 5 ns
	async_6    	equ 000000006h	; 6 ns
	async_7    	equ 000000007h	; 7 ns
	async_8    	equ 000000008h	; 8 ns
	async_9    	equ 000000009h	; 9 ns
	async_10    	equ 00000000Ah	; 10ns
	async_11    	equ 00000000Bh	; 11ns
	async_12    	equ 00000000Ch	; 12ns
	async_13    	equ 00000000Dh	; 13ns
	async_14    	equ 00000000Eh	; 14ns
	async_15    	equ 00000000Fh	; 15ns
	
; Read Preamble(dch)
	rp_data    	equ 0FFFFF0FFh	; Read Preamble (4bit)
	rp_20    	equ 000000000h	; 2.0ns
	rp_25    	equ 000000100h	; 2.5ns
	rp_30    	equ 000000200h	; 3.0ns
	rp_35    	equ 000000300h	; 3.5ns
	rp_40    	equ 000000400h	; 4.0ns
	rp_45    	equ 000000500h	; 4.5ns
	rp_50    	equ 000000600h	; 5.0ns
	rp_55    	equ 000000700h	; 5.5ns
	rp_60    	equ 000000800h	; 6.0ns
	rp_65    	equ 000000900h	; 6.5ns
	rp_70    	equ 000000A00h	; 7.0ns
	rp_75    	equ 000000B00h	; 7.5ns
	rp_80    	equ 000000C00h	; 8.0ns
	rp_85    	equ 000000D00h	; 8.5ns
	rp_90    	equ 000000E00h	; 9.0ns
	rp_95    	equ 000000F00h	; 9.5ns
	
; Idle Cycle Limit(dch)
	icl_data	equ 0FFF8FFFFh	; Idle Cycle Limit (3bit)
	icl_0		equ 000000000h	; 0 clock
	icl_4		equ 000010000h	; 4 clock
	icl_8		equ 000020000h	; 8 clock
	icl_16		equ 000030000h	; 16clock
	icl_32		equ 000040000h	; 32clock
	icl_64		equ 000050000h	; 64clock
	icl_128		equ 000060000h	; 128clock
	icl_256		equ 000070000h	; 256clock

; Dynamic idle cycle counter enable(dch)
	dicc_data	equ 0FFF7FFFFh	; Dynamic idle cycle limit (1bit)
	dicc_disable	equ 000000000h	; disabled
	dicc_enable	equ 000080000h	; enabled
	
; Memory Clock Frequency(dch)
	mcf_data	equ 0FF8FFFFFh	; Memory Clock Frequency (3bit)
	mcf_100		equ 000000000h	; 100MHz 
	mcf_133		equ 000200000h	; 133MHz
	mcf_166		equ 000500000h	; 166MHz
	mcf_200		equ 000700000h	; 200MHz (1:1)


;---------------------------------------------------------------------
; DRAM DQS Delay Line Register
;---------------------------------------------------------------------
; DQS Slew Value(ddr)
	dqs_data	equ 0FF00FFFFh	; Delay Line Adjust (8bit)
	dqs_1		equ 000010000h	; 1
	dqs_2		equ 000020000h	; 2
	dqs_3		equ 000030000h	; 3
	dqs_4		equ 000040000h	; 4
	dqs_5		equ 000050000h	; 5
	dqs_6		equ 000060000h	; 6
	dqs_7		equ 000070000h	; 7
	dqs_8		equ 000080000h	; 8
	dqs_9		equ 000090000h	; 9
	dqs_10		equ 0000A0000h	; 10
	dqs_255		equ 000FF0000h	; 255

; DQS Slew Control(ddr)
	dqsc_data	equ 0FCFFFFFFh	; Adjust DQS (1bit) & (1bit)
	dqsc_slow	equ 001000000h	; Slower DQS
	dqsc_fast	equ 002000000h	; Faster DQS
	

;---------------------------------------------------------------------
; Sub Routine
;---------------------------------------------------------------------			
	ORG 100h

SAVE1	PROC	 NEAR			; Save all register that will be affected by our code
	push eax
	push ebx
	push edx
	pushfd
	ret
SAVE1	ENDP

SENDER	PROC	 NEAR			; Active communication with address
	mov dx,address
	out dx,eax
	ret
SENDER	ENDP

RECEIVER	PROC	NEAR		; Comunicate with the address & receive the data
	mov dx,address
	out dx,eax
	mov dx,data
	in eax,dx
	ret
RECEIVER	ENDP

TUNER1	PROC	NEAR			; Sending new data from ebx stack
	xchg eax,ebx
	out dx,eax
	xchg eax,ebx
	ret
TUNER1		ENDP

TUNER2	PROC	NEAR			; Increase data (OR)
	or eax,ebx
	out dx,eax
	ret
TUNER2		ENDP

TUNER3	PROC	NEAR			; Decrease data (AND)
	and eax,ebx
	out dx,eax
	ret
TUNER3		ENDP

RETURN1	PROC	NEAR			; Restore register contents and return far to system
	popfd
	pop edx
	pop ebx
	pop eax
	retf
RETURN1		ENDP

RETURN2	PROC	NEAR			; Restore register contents and return to SATA bios
	popfd
	pop edx
	pop ebx
	pop eax
	retf
RETURN2		ENDP

;---------------------------------------------------------------------
; Main Routine
;---------------------------------------------------------------------

INIT	PROC	NEAR

; save all register that will be affected by our code
	call SAVE1

; trc = 13
	mov eax,dtl_add
	mov ebx,trc_13
	call RECEIVER
	and eax,trc_data
	call TUNER2

; trfc = 15
	mov eax,dtl_add
	mov ebx,trfc_15
	call RECEIVER
	and eax,trfc_data
	call TUNER2

; END Patch back to system bios or SATA jump (RETURN1 = System ; RETURN2 = SATA jump)
	call RETURN2

INIT	ENDP

	ORG 200h

CSEG	ENDS	
		END		

;---------------------------------------------------------------------
; tictac A64 Bios Tweaker Rev 001 Alpha
;---------------------------------------------------------------------