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

see "# dmidecode"

Under system information and base board information

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

[Peter Stuge]

[e-mail] wrote:
> see "# dmidecode"
>
> Under system information and base board information
>
> I am curious as to how it survives the coreboot flash re-write, maybe 
> the EC?

The "IBM ThinkPad Embedded Controller -[ ... ]-" SMBIOS string?

That's the EC firmware build number and the EC interface functional
specification identifier, they are read from the EC at boot in
src/ec/lenovo/h8/h8.c h8_smbios_strings()

//Peter

[Alexander Couzens]

> 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.

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.