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？
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/ m" R4 f3 U7 B4 g7 e( R smbus bios.pdf (133.96 KB, 下载次数: 736)

2012-1-2 19:40 上传

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$ Q3 y; |3 E; z/ U# ~& x2 e8 g1 {4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
Interface and if so, which version of the specification it supports.  The values passed in BL and
- y  D3 Y! z' n% I! i1 _CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
  j0 T" i/ W8 {% i2 D# _* U: m8 C5 jpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
$ A+ A) _( H9 a& P% l9 Sspecification supported by the SMBus BIOS.
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
. m5 n3 }: P' Joperating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
% n8 x6 X! p  }( x( I/ V: ~; T" bCall With

AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
CH = 61H
CL = 64H
Returns
% s+ w) g  `* B0 ]If function successful:
Carry = 0 SMBus is supported by BIOS
" Z# E9 T  q+ U& x$ H8 iAH = 01H SMBus BIOS Interface Specification major
* g  h' G$ c1 h9 ^$ I" jversion number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
' o' |8 c0 e$ f  D7 k8 ]$ Iversion number (in BCD format)
8 U; u+ F% J8 ABL = Number of SMBus Devices Present
3 K5 E# `* g6 u+ ?" FCH = ASCII "i" character (69H)
& Z4 X- d8 U# @, q  ^CL = ASCII "A" character (41H)
9 U+ y3 k8 F# K( M; V" x; eDX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
" ~) K5 T' I8 gIf function unsuccessful:
Carry = 1
% D6 p3 ?+ {" ]2 q: ~- yAH = Error code
" Y) a& ~$ _1 O- U* G& U0AH  SMBus invalid signature
86H  SMBus not supported

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