sdramopt.asm

X86 GX1 BOOTLOAD代码 ,支持WINCE操作系统!

	and	eax,01b			; insure only bits we need
	shl	eax,5			; shift to proper position
	or	edx,eax			; or in to saved value

	;X-bus round robin
	mov	cx,TOKEN_SDRAM_XBUSARB
	call	GetNVRAMValue
	and	eax,01b			; insure only bits we need
	shl	eax,5			; shift to proper position
	or	edx,eax			; or in to saved value
; mem_ctrl1 set now write it
	mov	eax, CPU_MC_MEM_CNTRL1
	call	CpuMemRegWriteStack

; now do mem_ctrl2
	mov	eax, CPU_MC_MEM_CNTRL2
	call	CpuMemRegReadStack
	and	edx, SDCLK_SHIFT_CLR AND 011b	; clear	the shift value& rd, fstrdmsk

	;SSHFTSDCLK
	mov	cx,TOKEN_SDRAM_SHIFT
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,3			; shift to proper position
	or	edx,eax			; or in to saved value
	
	;Read data phase
	mov	cx,TOKEN_SDRAM_RD
	call	GetNVRAMValue
	and	eax,01b			; insure only bits we need
	shl	eax,1			; shift to proper position
	or	edx,eax			; or in to saved value

	;X-bus round ro
	mov	cx,TOKEN_SDRAM_FSTRDMSK
	call	GetNVRAMValue
	and	eax,01b			; insure only bits we need
	or	edx,eax			; or in to saved value
	
	; write mem_ctl2
	mov	eax, CPU_MC_MEM_CNTRL2
	call	CpuMemRegWriteStack	; write	new shift value
	
; now MC_SYNC_TIM1
	mov	eax, CPU_MC_SYNC_TIM1
	call	CpuMemRegReadStack
	mov	ecx, DWORD PTR cs:[si+8]
	AND	edx, 08008888Fh		; clear what we change

	;CAS Latency
	mov	cx,TOKEN_CAS_LATENCY
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,28			; shift to proper position
	or	edx,eax			; or in to saved value

	;tRC
	mov	cx,TOKEN_MEM_TRC
	call	GetNVRAMValue
	and	eax,01111b		; insure only bits we need
	shl	eax,24			; shift to proper position
	or	edx,eax			; or in to saved value

	;tRAS
	mov	cx,TOKEN_MEM_TRAS
	call	GetNVRAMValue
	and	eax,01111b		; insure only bits we need
	shl	eax,20			; shift to proper position
	or	edx,eax			; or in to saved value

	;tRP
	mov	cx,TOKEN_MEM_TRP
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,16			; shift to proper position
	or	edx,eax			; or in to saved value

	;tRCD
	mov	cx,TOKEN_MEM_TRCD
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,12			; shift to proper position
	or	edx,eax			; or in to saved value

	;tRRD
	mov	cx,TOKEN_MEM_TRRD
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,8			; shift to proper position
	or	edx,eax			; or in to saved value

	;tDPL
	mov	cx,TOKEN_MEM_TDPL
	call	GetNVRAMValue
	and	eax,0111b		; insure only bits we need
	shl	eax,4			; shift to proper position
	or	edx,eax			; or in to saved value

; write MC_SYNC_TIM1
	mov	eax, CPU_MC_SYNC_TIM1
	call	CpuMemRegWriteStack		; write	new shift value
	
; transition start clock
	mov	eax, CPU_MC_MEM_CNTRL1		; must transistion start sdclk for
	call	CpuMemRegReadStack		;  new values to take effect
	push	edx	; save mem_cntrl1 value	as enabledimm trashes bit 13
	NOSTACK	si, CpuEnableDimm		; enable the DIMM as we set cas
	pop	edx			; get saved mem_cntrl1 value
	mov	eax, CPU_MC_MEM_CNTRL1		; 
	and	edx, SDCLK_START_CLR		; must transistion start sdclk for
	call	CpuMemRegWriteStack		;  new values to take effect
	or	edx, SDCLK_START_SET
	call	CpuMemRegWriteStack
	
	
	
exit_manual:
	pop	bx
	jmp	bx
memRAMoptimize ENDP

;**************************************************************************
;*
;*	pc66orPc100
;*
;*	Entry:
;*	Exit:
;*	Destroys:
;*
;**************************************************************************
pc66orPc100	PROC NEAR
	mov	bp,MEM_ACCESS_BUS	; memory devices are on this access bus
	call	csInitI2CStack		; set direction	of GPIO	clk
	xor	dx, dx
	xor	cx, cx

	push	cx
	push	edx

	mov	eax, CPU_MC_BANK_CFG
	call	CpuMemRegReadStack
	mov	ax, dx

	pop	edx
	pop	cx

	and	ax, 070h
	cmp	ax, 070h
	je	checkForDimm1SPD
	or	dl, 01h

checkForDimm0EESPD:
	push	cx
	push	dx
	mov	bx, 0
	mov	bl, cs:DimmEEPROMAddr[bx]	; array	of EEPROM address
	shl	bl, 1
	or	bl, 0A0h
	mov	cx, 126			; PC100-PC66 identifier
	call	csGetSPDByte		; read value is	in bx
	pop	dx
	pop	cx
	mov	cl, bl			; save Dimm0 PC-speed
	jc	checkForDimm1SPD
	or	dl, 02h
	mov	cl, bl			; save Dimm0 PC-speed

checkForDimm1SPD:

	push	cx
	push	edx

	mov	eax, CPU_MC_BANK_CFG
	call	CpuMemRegReadStack
	shr	edx, 16
	mov	ax, dx

	pop	edx
	pop	cx

	and	ax, 070h
	cmp	ax, 070h
	je	verifySPD
	or	dl, 04h

	push	cx
	push	dx
	mov	bx, 1
	mov	bl, cs:DimmEEPROMAddr[bx]	; array	of EEPROM address
	shl	bl, 1
	or	bl, 0A0h
	mov	cx, 126			; PC100-66 identifier
	call	csGetSPDByte		; read value is	in bx
	pop	dx
	pop	cx
	mov	ch, bl			; Save Dimm1 PC-Speed
	jc	verifySPD
	or	dl, 08h
	mov	ch, bl			; Save Dimm1 PC-Speed

verifySPD:
	mov	al, 0
	and	dl, 0Fh
	cmp	dl, 03h			; Dimm0	with EEPROM / no Dimm1
	je	FoundPC
	cmp	dl, 0Ch			; no Dimm0 / Dimm1 with	EEPROM
	je	FoundPC
	cmp	dl, 0Fh			; Dimm0	with EEPROM/ Dimm1 with	EEPROM
	jne	NoPc
FoundPC:
	add	cl, ch
	cmp	cl, 200			; 200 total? Got two PC-100 dimms
	je	FoundPc100
	cmp	cl, 100
	jne	NoPc			; Found	something but not pc100
					; Otherwise, we're golden
FoundPc100:
	mov	al, 064h
NoPc:

	ret
pc66orPc100	ENDP

;**************************************************************************
;*
;*	ckPC133
;*
;*	Entry:
;*	Exit:
;*	Destroys:
;*
;**************************************************************************
ckPC133	PROC NEAR
	mov	bp,MEM_ACCESS_BUS	; memory devices are on this access bus
	call	csInitI2CStack			; set direction of GPIO clk
	xor	dx, dx
	xor	cx, cx

	push	cx
	push	edx

	mov	eax, CPU_MC_BANK_CFG
	call	CpuMemRegReadStack
	mov	ax, dx

	pop	edx
	pop	cx

	and	ax, 070h
	cmp	ax, 070h
	je	checkForDimm1SPD133
	or	dl, 01h

checkForDimm0EESPD133:
	push	cx
	push	dx
	mov	bx, 0
	mov	bl, cs:DimmEEPROMAddr[bx]	; array of EEPROM address
	shl	bl, 1
	or	bl, 0A0h
	mov	cx, 09h						; PC133 identifier
	call	csGetSPDByte			; read value is in bx
	pop	dx
	pop	cx
	mov	cl, bl						; save Dimm0 PC-speed
	jc	checkForDimm1SPD133
	or	dl, 02h
	mov	cl, bl						; save Dimm0 PC-speed


checkForDimm1SPD133:

	push	cx
	push	edx

	mov	eax, CPU_MC_BANK_CFG
	call	CpuMemRegReadStack
	shr	edx, 16
	mov	ax, dx

	pop	edx
	pop	cx

	and	ax, 070h
	cmp	ax, 070h
	je	verifySPD133
	or	dl, 04h

	push	cx
	push	dx
	mov	bx, 1
	mov	bl, cs:DimmEEPROMAddr[bx]	; array of EEPROM address
	shl	bl, 1
	or	bl, 0A0h
	mov	cx, 09h						; PC133 identifier
	call	csGetSPDByte			; read value is in bx
	pop	dx
	pop	cx
	mov	ch, bl						; Save Dimm1 PC-Speed

	jc	verifySPD133
	or	dl, 08h
	mov	ch, bl						; Save Dimm1 PC-Speed

verifySPD133:
	mov	al, 0
	and	dl, 0Fh
	cmp	dl, 03h 					; Dimm0 with EEPROM / no Dimm1
	je	FoundPC133
	cmp	dl, 0Ch 					; no Dimm0 / Dimm1 with EEPROM
	je	FoundPC133
	cmp	dl, 0Fh 					; Dimm0 with EEPROM/ Dimm1 with EEPROM
	jne	NoPc133

FoundPC133:
	add	cl, ch
	cmp	cl, 0EAh					; 200 total? Got two PC-100 dimms
	je	DonePc133
	cmp	cl, 075h
	jne	NoPc133						; Found something but not pc100
									; Otherwise, we're golden
DonePc133:
	mov	al, 075h
NoPc133:
	ret
ckPC133	ENDP
_TEXT ENDS

	END