> I am curious as to how it survives the coreboot flash re-write, maybe 
> the EC?

e.g.
> Base Board Information
>       Manufacturer: LENOVO
>       Product Name: 4291QT1
>       Version: ThinkPad X220
>       Serial Number: XYZU1234...

comes from a small i2c eeprom (at24 based).
src/drivers/i2c/at24rf08c/lenovo_serials.c

best,
lynxis

ps: The at24 also contains your lenovo bios password.
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Alexander Couzens

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