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？
0 W. F, C) \; x' X# e
smbus bios.pdf (133.96 KB, 下载次数: 862)

2012-1-2 19:40 上传

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4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
  }5 }  Z; X% L3 o& \* K; ]Interface and if so, which version of the specification it supports.  The values passed in BL and
! e, D# p8 \0 N2 ZCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
  I0 r. v# a2 u& F$ w9 B9 Ipresent, will result in an SMBus invalid signature error.
+ s7 [1 Q5 h' L* E% X9 oThe version number returned by this call is the highest level of SMBus BIOS Interface
specification supported by the SMBus BIOS.
The vendor-specified hardware code may be optionally used to identify the SMBus host
2 v5 j- e* `: s/ q5 Phardware.  If this feature is not used, it must return zero.  This return code may be used by
5 ?2 f- g9 e% j: d( Voperating systems that do not want to use the BIOS services, but rather want to identify and
  O; |2 o7 a! w3 jcommunicate directly with the hardware.
Call With

: R( `- G7 f1 X4 w9 t; K  TAX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
CH = 61H
# y& \" h1 F: Q* T! Z- ?CL = 64H
9 v) p  ^4 y) u( Z! E" GReturns
If function successful:
$ h! d7 _* X* nCarry = 0 SMBus is supported by BIOS
" \) }9 N0 \$ {$ {. fAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
, z2 }& J/ e- A3 P! NAL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
: [% P  B7 p5 k- y1 H# kIf function unsuccessful:
% l. d) A2 {+ `! J8 nCarry = 1
AH = Error code
0 n5 y2 X4 v5 `; Y& O0AH  SMBus invalid signature
5 ^: M2 l( ^) E( V1 N2 e86H  SMBus not supported

qhbqyj

有同样的疑惑