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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, D/ a5 ]5 P6 ~( G4 A  T* { smbus bios.pdf (133.96 KB, 下载次数: 235)

2012-1-2 19:40 上传

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+ d# E: W$ ?4 ]1 D! y" V. T4.1.1 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
CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
- O# k  I1 e/ V3 e8 p' l8 Z, X" D3 Hpresent, will result in an SMBus invalid signature error.
, G3 r. }" U% F2 ^+ TThe version number returned by this call is the highest level of SMBus BIOS Interface
. f4 `, v, W5 @% r6 X, Hspecification supported by the SMBus BIOS.
The vendor-specified hardware code may be optionally used to identify the SMBus host
5 |$ |$ k# n( R1 @2 thardware.  If this feature is not used, it must return zero.  This return code may be used by
' z6 t5 Q* Y: c; a+ C  W. Zoperating systems that do not want to use the BIOS services, but rather want to identify and
! P0 u/ h0 w( r  U6 f  Gcommunicate directly with the hardware.
Call With
* z. e5 U. V( [
AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
# o: ]& ]% e! C6 C; w. d' L1 h+ }, MCH = 61H
! y1 ?. _' [5 ?# {; CCL = 64H
Returns
If function successful:
& {. D6 k9 h: @5 F3 bCarry = 0 SMBus is supported by BIOS
( B: \1 d# a0 w7 x* r* u  {' Z4 |AH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
. T! j( I. ]) X& v" {  Tversion number (in BCD format)
! `  U0 Y  _2 |9 U5 UBL = Number of SMBus Devices Present
5 o5 w3 [% L$ U9 O) G: g% WCH = ASCII "i" character (69H)
; B/ Q0 @6 R* n9 }CL = ASCII "A" character (41H)
9 E4 F% E6 i$ x1 v% G* O+ VDX = Vendor Specified SMBus Hardware Code
& P8 f* y& a. _# B0000H indicates undefined hardware
If function unsuccessful:
1 W$ |. |+ v+ |# @Carry = 1
AH = Error code
$ G7 E6 C* ?+ V( V# ~0AH  SMBus invalid signature
& S! z; ]% {5 c& U+ m  J, r; y86H  SMBus not supported

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