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？

; K' w0 w# U" `  E smbus bios.pdf (133.96 KB, 下载次数: 617)

2012-1-2 19:40 上传

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4.1.1 SMBus Installation Check (01H)
& X0 D) Y! D% NThis call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
1 p  U) D' i/ N+ A; [. hInterface 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
) K9 W6 r7 M0 G( w! _/ I6 `present, will result in an SMBus invalid signature error.
+ j; F$ u6 f  g$ u" `3 i: rThe version number returned by this call is the highest level of SMBus BIOS Interface
2 D+ L8 W- a) G# @' gspecification 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
% V  {' x8 c' L4 ]6 X8 Roperating systems that do not want to use the BIOS services, but rather want to identify and
& g& D4 Q7 o9 T) V8 I9 \communicate directly with the hardware.
Call With

AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
  r9 Z) W! v1 C# W9 @* v  uBL = 72H
CH = 61H
CL = 64H
; F  i% d' n5 R, x- T0 d* z9 d; PReturns
1 |: c) t: K2 p/ G( ^6 V- E+ lIf function successful:
Carry = 0 SMBus is supported by BIOS
AH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
7 _9 l- E2 `* W; Z8 N: zAL = 00H SMBus BIOS Interface Specification minor
% p8 j1 R8 Z) J  o9 ?version number (in BCD format)
1 h( J8 A3 M  s$ l; C. Y: wBL = 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
" A- [' ]/ N4 G% q2 TIf function unsuccessful:
" M' D% }' u3 |- N# C1 F6 pCarry = 1
8 I" |0 C+ R0 G% _AH = Error code
0AH  SMBus invalid signature
86H  SMBus not supported

qhbqyj

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