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？

* _. H5 s. H- B6 A. `) _: } smbus bios.pdf (133.96 KB, 下载次数: 809)

2012-1-2 19:40 上传

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4.1.1 SMBus Installation Check (01H)
, _. d: T' m* G- TThis 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
CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
4 `- X5 }4 W, A2 f8 q8 N. Wpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
: V' N- x8 i! [specification supported by the SMBus BIOS.
The vendor-specified hardware code may be optionally used to identify the SMBus host
4 G& t, X! a8 |4 ~0 x7 {7 E2 o: ghardware.  If this feature is not used, it must return zero.  This return code may be used by
$ {' d- ?% q& D! T" e& Aoperating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
Call With

, I+ ~( N3 p( A! \* v" `6 a. VAX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
CH = 61H
% p& S5 L. ]) r6 L: dCL = 64H
: h, N9 f( [# ?4 f% f+ r8 IReturns
If function successful:
# F/ Z$ N/ d! X' S! F& k  GCarry = 0 SMBus is supported by BIOS
. \, \6 |- J" P, X: yAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
1 e4 o/ @- M4 V% Iversion number (in BCD format)
BL = Number of SMBus Devices Present
( c; _3 n! ~2 [CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
9 J; \3 g, e. z2 E; v' @/ iCarry = 1
AH = Error code
. G0 A0 Z; ^& t/ M2 j0AH  SMBus invalid signature
86H  SMBus not supported

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