Messages in this thread | | | Date | Thu, 4 Nov 2004 14:02:36 +0100 (CET) | Subject | Re: dmi_scan on x86_64 | From | "Jean Delvare" <> |
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On 4/11/2004, Daniel Egger wrote:
> The sensors conf for the S2875 provided by Tyan only displays > 3 FAN RPM values while the board has at least 4. At the moment I'm > using 3 fans with tacho signal but can only determine 2 values, the > third value is constantly 0.
The (admittedly limited) documentation [1] I have for the S2875 states that only 3 of the 6 fan headers have their tachometer pin wired. This matches the W83627HF hardware monitoring chip capabilities, which is why I see no evidence of any kind of multiplexing on that board.
> Also the setup puzzles me a bit; why would Tyan pack several SMBus > setups into a single motherboard but only connect devices to one > of them. Actually sensors-detect claims that there is one > unrecognized client on the "unused" SMBus.
Not all SMBus clients are hardware monitoring chips. The fact that sensors-detect didn't recognize it would even suggest that your unknown chip isn't. What you see may be about anything, including pseudo-clients used for the SMBus protocol itself.
Feel free to submit a dump (using i2cdump) of that unknown chip if you want me to comment on it.
As a side note, Tyan actually has a long history of embedding more than one hardware monitoring chip in their high-end server boards. This makes full sense when the board has plenty of fan headers and supports several CPU. The S4882 for example has 6 hardware monitoring chips, and this is one reason why the SMBus had to be multiplexed (4 of these chips use the same address).
[1] ftp://ftp.tyan.com/datasheets/d_s2875_120.pdf
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