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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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)
, h: }9 H9 b8 [This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
# d! ?+ z/ x6 ^Interface and if so, which version of the specification it supports.  The values passed in BL and
# Y) `- u( Z3 H4 \CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
: r: z$ b, }) r' Q% [9 h8 Cpresent, will result in an SMBus invalid signature error.
% B: K: u" G5 E- _5 q7 y  {The 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
hardware.  If this feature is not used, it must return zero.  This return code may be used by
9 E) |+ M- c  ?6 g/ n2 c9 s4 T" ~operating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
) j1 @" f* s& q& @% DCall With
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# x, P; e) @% [" ]AX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
% G  n+ C9 f" I" c; D& h1 uBL = 72H
* ~4 z* t6 s% @2 y2 v, e! ZCH = 61H
CL = 64H
* ?$ `- b9 d4 X% ~  C  |Returns
If function successful:
Carry = 0 SMBus is supported by BIOS
4 m) r! M; I! P4 t- L, `$ I) VAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
6 O7 I2 `1 l* ?5 zAL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
! b# z  ~$ |/ U  ^3 yCH = ASCII "i" character (69H)
" o# J3 w/ ?. S2 XCL = ASCII "A" character (41H)
' c1 K9 K3 q  _" e- X. IDX = Vendor Specified SMBus Hardware Code
" {9 u$ I$ V* P0000H indicates undefined hardware
9 t- N, n; `$ z8 S1 {% VIf function unsuccessful:
( g1 ^' n. Z+ eCarry = 1
AH = Error code
3 b, K9 p4 ]6 |2 h8 T1 Q0AH  SMBus invalid signature
0 D0 Q. K6 U4 E% Q86H  SMBus not supported

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