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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  }0 [$ [! q1 U/ b. ]( A
4.1.1 SMBus Installation Check (01H)
- v( P4 x, K6 p' S3 ^This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
# S& Y# Z% }: o# a3 R- L3 d) sInterface and if so, which version of the specification it supports.  The values passed in BL and
# f: _/ b$ k1 y" P( ZCX 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 Y" F$ v; [% |7 Z. KThe version number returned by this call is the highest level of SMBus BIOS Interface
specification supported by the SMBus BIOS.
7 v1 Y) H2 y+ I! [The vendor-specified hardware code may be optionally used to identify the SMBus host
! d9 L$ w" r2 d+ @- v' |% }" ?( i+ Lhardware.  If this feature is not used, it must return zero.  This return code may be used by
9 T$ l/ I  \4 C+ k) Q& woperating 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
BL = 72H
4 a6 w1 c4 H) @5 y5 ~0 J$ _2 f( A7 TCH = 61H
CL = 64H
# {/ }- N( @' |3 e1 gReturns
If function successful:
Carry = 0 SMBus is supported by BIOS
: V0 a: L/ a5 `+ D6 ZAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
; G, ~* ?- A4 t( w% h7 ?5 y3 g/ kAL = 00H SMBus BIOS Interface Specification minor
- l( }: j$ P! }% Vversion number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
6 l3 _$ f  t2 Z/ M* Q" f# c$ Q% GCL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
! J2 j) @0 H* d/ S/ a- s: Y; SIf function unsuccessful:
Carry = 1
AH = Error code
0AH  SMBus invalid signature
9 E7 E, X/ w+ i( b9 j. n86H  SMBus not supported

qhbqyj

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