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？
2 y) L: A3 L$ \; f, V% y
' P" T2 m5 H& n2 x3 q smbus bios.pdf (133.96 KB, 下载次数: 739)

2012-1-2 19:40 上传

点击文件名下载附件

, @9 }$ o. K/ q# @! O' P
4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
3 F, ]2 p' g& V/ kInterface and if so, which version of the specification it supports.  The values passed in BL and
; {1 {) u$ ~/ Q9 @) q+ Y! ~1 N. cCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
3 h3 @4 o* V" |: E# C" ^present, will result in an SMBus invalid signature error.
/ K/ Q6 O5 I8 S6 q( x/ t6 A$ GThe version number returned by this call is the highest level of SMBus BIOS Interface
: M8 b: B% D/ g( L, t6 fspecification supported by the SMBus BIOS.
The vendor-specified hardware code may be optionally used to identify the SMBus host
hardware.  If this feature is not used, it must return zero.  This return code may be used by
; g" Q3 b$ G( V# }+ s: t1 K; uoperating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
Call With
# i4 n. k% m9 }8 S0 ~
AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
& M' e0 Q& d! I& hCH = 61H
, h8 q/ y! E7 y3 OCL = 64H
, }+ v+ a" C6 P  D+ BReturns
  Q  }# Z# V) Q' I1 s0 i+ A% OIf function successful:
7 w7 L# g& h' \+ x1 xCarry = 0 SMBus is supported by BIOS
) }, `" B" ^: l" pAH = 01H SMBus BIOS Interface Specification major
6 K( ^1 e6 F/ ^7 a/ z: rversion number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
6 @) C2 |! N4 m" WCH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
Carry = 1
  v" N: E6 k$ gAH = Error code
0AH  SMBus invalid signature
86H  SMBus not supported

qhbqyj

有同样的疑惑