Intel ICH9 Memory SPD读取

dvovo · 发表于 2009-7-21 09:57:34

根据bios代码写了个SPD读取,就是不出结果,每次调试输出host status register都是FF,代码基本和bios一样,机器也是ICH9的机器,代码如下:

  .model small
  .386
  CFG_ADDR EQU 0CF8h
  CFG_DATA EQU 0CFCh
  SMBUS_BUS EQU 0
  SMBUS_DEVICE EQU 31
  SMBUS_FUNC EQU 3

  .stack 100h
  .data
base dw ?  ;smbus I/O space
num  db 0  ;byte select
SmbStatus db ?

  .code

LF_CR MACRO
  pusha
  mov    dl,0dh
mov    ah,2
  int    21h
  mov    dl,0ah ;next line
  mov    ah,2
  int    21h
  popa
   ENDM

main proc far
mov ax,@data
mov ds,ax

mov eax,8000FB20h ;Bus 0,Device 32,Function 3,20h
mov dx,CFG_ADDR
out dx,eax
mov dx,CFG_DATA
in eax,dx

shr ax,5    ;bit 15-5,the base address
and ax,0000011111111111b
mov base,ax

call ReadSpd
exit:
mov ax,4c00h
int 21h
main endp

ReadSpd proc
pusha
Again:
mov ah,num
  and ah,00001111b
.if(ah==15d) ;CR_LF
  LF_CR
.endif

.repeat
  mov dx,base ;reset host,claim host in use
  add dx,0
  mov al,40h
  out dx,al

  mov dx,base
  in al,dx
  mov SmbStatus,al

  mov dx,base ;clear all status bits
  mov al,1Eh ;host status register
  out dx,al

  mov dx,base ;set offset to read
  add dx,3 ;host command register
  mov al,num
  out dx,al

  mov dx,base ;Transimit Slave Address register
  add dx,4
  mov al,0a1h
  out dx,al

  mov dx,base ;set "Read Word" protocol and start bit
  add dx,2 ;Host Control register
  mov al,48h
  out dx,al


  mov dx,base
  in al,dx
  mov SmbStatus,al
  and al,1Eh
  .while (al==0) ;check repeatly until any of
mov dx,base    ;FAIL,BERR,DERR,INTR
in al,dx
mov SmbStatus,al
and al,1Eh
  .ENDW

  mov al,SmbStatus
  and al,1Ch
  .if (al!=0) ;check for errors
mov al,SmbStatus
and al,08h
.continue .if (al!=0)
jmp @F
.else
  mov dx,base
  add dx,5h
  in al,dx
  call binhex
  .break
.endif

  .until (0)


mov dl,20h ;output a space
mov ah,2
pusha
int 21h
popa
inc num

cmp num,80h ;get first spd 128 bytes
jnz Again

@@:
popa
ret
ReadSpd endp

binhex proc
pusha

mov ch,2 ;2 hexadecimal digits to be printed
loop3:
mov cl,4 ;bits to be shifted
rol al,cl
mov bl,al
and bl,0fh ;mask the 4-bit Msb
add bl,30h
cmp bl,3ah
jl next1  ;number or alpha?
add bl,7
next1:
mov ah,2  ;print one hexadecimal digit
mov dl,bl
pusha
int 21h
popa
dec ch
jnz loop3
popa
ret
binhex endp
end main

dvovo · 发表于 2009-7-21 12:30:37

问题已解决

Faintsnow · 发表于 2009-7-21 13:40:23

我做过一个可以支持SIS968/962/961 VIA8235 Intel ICHx/ICH7/8/9 ATI SB400/600 NV CK804的SPD tool. ICH9的读法应该是和ICH7/8一致的

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