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]

Taiidan(a)gmx.com 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.
-- 
Alexander Couzens

mail: lynxis(a)fe80.eu
jabber: lynxis(a)fe80.eu
mobile: [phone]
gpg: 390D CF78 8BF9 AA50 4F8F  F1E2 C29E 9DA6 A0DF 8604

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.