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？

* r2 r7 T: U: x+ R% m smbus bios.pdf (133.96 KB, 下载次数: 226)

2012-1-2 19:40 上传

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3 d) q) f1 p6 _& y/ x3 \5 t* h4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
" R* H2 ~. T  r# g  g, e8 m, @Interface and if so, which version of the specification it supports.  The values passed in BL and
8 g7 w; l% N6 A/ D, i2 [( cCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
$ e1 }! ^' e, G6 \" f0 Ppresent, will result in an SMBus invalid signature error.
. l# ]# r, z) C6 L! N6 t; h1 x" J! fThe version number returned by this call is the highest level of SMBus BIOS Interface
specification supported by the SMBus BIOS.
7 N/ Y0 Q7 q4 X1 {% b9 CThe 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
4 M/ F2 i2 [* `7 p" I( |# |, L9 uoperating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
( O# s3 Y+ O; k4 SCall With
4 g- S* @+ T! u! v& P* P4 b
AX = 53B0H SMBus Access
3 u* [& F: ]4 s1 NBH = 01H SMBus Installation Check
6 \. O6 x9 o: P9 Q6 a2 RBL = 72H
CH = 61H
CL = 64H
2 R- p* O9 o7 M( v3 rReturns
If function successful:
- I# p% p4 k4 X" T% }1 ?Carry = 0 SMBus is supported by BIOS
+ s0 l/ E% P* r% |4 n) g; b( E& E2 _* sAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
7 D! t6 t, z0 a3 i7 iBL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
3 |7 z- [- U  p0000H indicates undefined hardware
If function unsuccessful:
Carry = 1
5 N& G' R1 F& e' k% Y6 m( |, aAH = Error code
0AH  SMBus invalid signature
" O1 o1 T1 h. v( u2 \86H  SMBus not supported

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