SMBus BIOS

kpshare

请问现在的BIOS是不是都不支持SMBus　BIOS了？我按照"System Management Bus BIOS Interface Specification"，在dos下check三台电脑都BIOS都发现不支持，是不是早就取消这项功能了？

. r: {& x8 v, r5 r. a% X9 @ smbus bios.pdf (133.96 KB, 下载次数: 798)

2012-1-2 19:40 上传

点击文件名下载附件

; @, R+ y1 c$ u) @- `; _6 J; @( J4.1.1 SMBus Installation Check (01H)
) O4 Q; z4 J1 f" h7 xThis call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
: Y: V0 u8 l5 @& r# [' j  RInterface and if so, which version of the specification it supports.  The values passed in BL and
; v1 j  S/ R1 k  A6 ZCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
6 ?8 }. e5 _8 F. f  K( A( Fpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
' |! l% d' d  X- jspecification supported by the SMBus BIOS.
3 l8 a0 e, ]% e) S& Q4 |The vendor-specified hardware code may be optionally used to identify the SMBus host
hardware.  If this feature is not used, it must return zero.  This return code may be used by
0 ?8 k9 X1 I& j$ D9 D8 @3 q; d  joperating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
Call With

AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
) T8 Z0 t+ h# _  I2 d$ {: aBL = 72H
CH = 61H
, `, y+ R" C/ Z. [, |8 y0 xCL = 64H
0 _! D  g  L5 q. {4 t/ j0 t! V( O6 iReturns
  J7 v  G1 w0 B+ rIf function successful:
Carry = 0 SMBus is supported by BIOS
: o! ?" H  ?- Z7 ?AH = 01H SMBus BIOS Interface Specification major
7 H8 c& E" {' }, `. B6 z( Zversion number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
4 a7 v. _) Q/ E. RDX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
' U$ v* }) |+ u  R3 L6 U" A% sIf function unsuccessful:
" e# ~- W/ @  K% h. LCarry = 1
2 D6 y  z/ z/ Y5 i; F) p% m) w8 AAH = Error code
0AH  SMBus invalid signature
" W& M- @/ _7 ~& x86H  SMBus not supported

qhbqyj

有同样的疑惑