Messages in this thread | | | Date | Thu, 22 Sep 2022 12:23:47 +0200 | From | Miquel Raynal <> | Subject | Exposing nvmem cells to userspace? |
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Hello Srinivas,
I am currently looking at the Open Compute Project ONIE Tlv tables in modern networking hardware. Thanks to the specification being available for many years and rather easy to implement, those tables are already present in many switches. Manufacturers just have to provide a small storage medium exposing factory-related information (manufacturer, date, serial#, mac addresses, etc) in Type-Length-Value fields, as well as their own extensions if they want. These tables are common, but there is currently no shared decoding logic, each provider maintaining its own internally.
I am currently looking for upstreaming an nvmem layout driver for exposing the standard nvmem cells. This way, Ethernet drivers might eg. take the base MAC address from there. But I feel like there is something missing, because the vendor name, the device version, the serial number or any other information available in these tables might also very well be used by the userspace rather than the kernel drivers only.
Thus, I was wondering if there was some ongoing work to make these cells available to userspace (in /sys maybe?) or if this had already been discussed somewhere. Otherwise, would you be open to such a contribution? I guess it would also be a useful debug tool anyway (and might very well be moved somewhere else than in /sys).
Thanks for your time, Miquèl
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