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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/ y. q. M( T* K smbus bios.pdf (133.96 KB, 下载次数: 499)

2012-1-2 19:40 上传

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4.1.1 SMBus Installation Check (01H)
3 ?* P# l) N- _  @This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
" R$ b$ _9 Z6 L( V$ `/ O/ ]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
$ I& e2 Q" P3 G" Vpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
specification supported by the SMBus BIOS.
; M# R8 f% a+ S. \0 c3 [. NThe 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: h9 ?# L6 ^5 r: {operating systems that do not want to use the BIOS services, but rather want to identify and
# b2 ^7 P. {2 E3 s, h* Z4 }communicate directly with the hardware.
Call With

' c$ S! ?4 r8 C% yAX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
5 A, J( k) O9 _BL = 72H
% z7 f, t/ m6 x! ]CH = 61H
CL = 64H
Returns
If function successful:
Carry = 0 SMBus is supported by BIOS
6 |3 \3 }- i# }; e) T8 F9 Q% RAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
, e  j' n6 Z0 B, n- i/ e+ zAL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
% s: h+ [0 v+ F% {$ GCH = ASCII "i" character (69H)
3 \3 b, h# Z% E# m- n1 o: q/ r0 ^CL = ASCII "A" character (41H)
+ o( [8 l& t8 f8 a4 IDX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
Carry = 1
AH = Error code
0AH  SMBus invalid signature
6 Z) V! G0 K$ m$ G' b% ~) g86H  SMBus not supported

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