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？
- g, r4 t& W4 t: v* Q! D3 x  `
smbus bios.pdf (133.96 KB, 下载次数: 800)

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4.1.1 SMBus Installation Check (01H)
/ I0 d7 A: P; N% c$ [This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
# Q0 i4 o& P4 X8 j( TInterface and if so, which version of the specification it supports.  The values passed in BL and
. R; X% X) M8 Z- R2 ]( @CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
0 u& y' x0 S( g- Z5 h* k& V" jpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
: y3 t+ I+ Q( J0 R6 S4 kspecification supported by the SMBus BIOS.
& b  k7 i8 W, o- n) ^# p$ rThe vendor-specified hardware code may be optionally used to identify the SMBus host
. C$ x9 i* i. Z: u! v0 G  d; Mhardware.  If this feature is not used, it must return zero.  This return code may be used by
# \% P  S# M& V' |: Xoperating systems that do not want to use the BIOS services, but rather want to identify and
2 ~0 U7 g/ A% m$ Vcommunicate directly with the hardware.
Call With
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AX = 53B0H SMBus Access
! H2 Y& a& q7 EBH = 01H SMBus Installation Check
9 O) q1 q( U# T  o1 \+ KBL = 72H
3 b8 h6 i& i1 ~) P* BCH = 61H
CL = 64H
Returns
If function successful:
! ~) t5 W/ I: x% NCarry = 0 SMBus is supported by BIOS
' r3 J4 m! j% O5 N& |AH = 01H SMBus BIOS Interface Specification major
) ^/ _* I0 ^; }1 \version number (in BCD format)
) M0 ^6 }; a* |/ ?, {) F  O; d# ZAL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
( e' W. J7 [- c/ @/ T5 V4 NCL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
3 t$ j7 E8 F9 i; L% {; {) _) XIf function unsuccessful:
Carry = 1
AH = Error code
% v  I5 k3 `% G( ]5 X( ?0AH  SMBus invalid signature
86H  SMBus not supported

qhbqyj

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