linux-kernel - Re: sensors-detect: Found unknown chip with ID 0x0404

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Date:   Thu, 11 Mar 2021 06:57:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Corentin Labbe <clabbe.montjoie@...il.com>, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: sensors-detect: Found unknown chip with ID 0x0404

On 3/11/21 6:17 AM, Corentin Labbe wrote:
> Hello
> 
> I have a server where sensors-detecte gives:
> Some Super I/O chips contain embedded sensors. We have to write to
> standard I/O ports to probe them. This is usually safe.
> Do you want to scan for Super I/O sensors? (YES/no): 
> Probing for Super-I/O at 0x2e/0x2f
> Trying family `National Semiconductor/ITE'...               Yes
> Found unknown chip with ID 0x0404
> 
> I have tried to search on the motherboard but didnt find any visible NS nor ITE chip. (could it be embeded in chipset or BMC for example ?)
> Furthermore, with another OS (a buildroot with more recent kernel), sensors-detect give that the ID is 0x0101.
> Any hope there is a real hwmon chip behind ?
> 

Unlikely, given that the ID is not stable and that both ID registers
return the same (changing) value. It could be a BMC or an EC but
that won't help since we don't know how to access it.

Guenter