Expose system Serial Number to userspace.

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I'm working on an embedded board which uses u-boot + linux. At
manufacturing time, the device serial number will be programmed into OTP
memory on NAND (probably from within u-boot). We'd like the linux kernel
to make this serial number available to be read from userspace. Is there
an accepted method to do this sort of thing?

One idea I had was to make the serial number available as a device node
(ie: you can simply read the serial number from "/dev/serialnumber"). Then
there's the question of how the kernel learns the serial in the first
place (a kernel boot command like parameter passed from u-boot?).

Does this sound sane, or is there a better way to do something like this?


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