[coreboot] Where is the serial number stored on the thinkpad ivy/sandy bridge laptops

[Taiidan at gmx.com]

On 09/26/2017 11:19 AM, Alexander Couzens wrote:

>> 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.
Ah thanks
How would one change the serial? and is this the only electronic 
identifier on an X230 besides the MAC?

I am also curious as to why this was included in coreboot.