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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9 c4 ]) M2 R5 h3 C4 \ smbus bios.pdf (133.96 KB, 下载次数: 842)

2012-1-2 19:40 上传

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9 W8 I  c, P, _, \; R4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
! I% B3 [0 n; ^" C7 uInterface and if so, which version of the specification it supports.  The values passed in BL and
9 ~* G" e' ?7 P$ b+ e  YCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
present, will result in an SMBus invalid signature error.
7 M" f+ L; ~0 s. J8 N* @: a3 D6 PThe 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
$ o) x; E" U" f" D1 a" |operating systems that do not want to use the BIOS services, but rather want to identify and
, y3 ]' E( b; \% m: bcommunicate directly with the hardware.
Call With

AX = 53B0H SMBus Access
8 V' Z" u3 h' P- f* rBH = 01H SMBus Installation Check
BL = 72H
CH = 61H
" e& h/ q/ w' J/ r% f( UCL = 64H
, ~* \6 ~0 q$ Y- B$ n5 zReturns
If function successful:
2 r# M5 ^6 h( h. p3 m5 K$ M1 YCarry = 0 SMBus is supported by BIOS
AH = 01H SMBus BIOS Interface Specification major
- w/ D( U, @" g" C# jversion number (in BCD format)
9 Q! V8 P7 k$ e; j3 ?" x  ~9 j- C. PAL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
3 m4 R$ d$ X+ z% Q5 _. U( y; oDX = Vendor Specified SMBus Hardware Code
1 Y$ h$ \) y6 O$ ]" W/ z7 t0000H indicates undefined hardware
If function unsuccessful:
0 k/ a/ L% t$ G/ E& YCarry = 1
AH = Error code
8 b7 Y; }3 f2 Q8 S0AH  SMBus invalid signature
86H  SMBus not supported

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