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？
: X# |' a  J/ q0 U" K; t$ V  U% ?
0 `& h' E) Q9 B4 U, g% ?. T smbus bios.pdf (133.96 KB, 下载次数: 441)

2012-1-2 19:40 上传

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. }+ N( ]1 C3 t1 F) z8 d4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
* G& k; @/ `. K5 |Interface and if so, which version of the specification it supports.  The values passed in BL and
+ L. O- R& f# W8 X  JCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
present, will result in an SMBus invalid signature error.
8 [* i& s) z- w) `5 @$ QThe version number returned by this call is the highest level of SMBus BIOS Interface
2 `: H1 M' u, a" `& Q% v' Yspecification supported by the SMBus BIOS.
" y+ W2 J. O6 \( E) ]9 f: kThe vendor-specified hardware code may be optionally used to identify the SMBus host
7 a7 H* |5 E* h) h: _hardware.  If this feature is not used, it must return zero.  This return code may be used by
9 d8 E6 I4 ^4 W) ?4 ]operating 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
; L: q& m3 `6 U( z7 @" vBH = 01H SMBus Installation Check
8 a5 N$ T6 I7 m1 r! O- zBL = 72H
CH = 61H
CL = 64H
( R2 g* A* S! lReturns
If function successful:
Carry = 0 SMBus is supported by BIOS
AH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
$ ?. b  {2 c. w( C/ |3 E2 F0 mversion number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
5 T! `$ R3 u: E7 @CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
, X$ f4 }, n  v) b0000H indicates undefined hardware
If function unsuccessful:
5 t* |" y  f5 T' c& pCarry = 1
: b: w- Z2 n' o+ G; l0 [6 {AH = Error code
0AH  SMBus invalid signature
86H  SMBus not supported

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