coreboot 4.13 rom for thinkpad x200 featuring seabios v. 1.14.0 https://seabios.org/Releases#SeaBIOS_1.14.0 commit 5c186c6777c9438ff4681929c9c25c98dee28bef
it has been compiled to use libgfixnit graphics initialization
Rom is 8mb, I could compile the 4 and 16mb as well for this model but I have just a laptop and it has a 8mb chip so I will not be able to test it.
gbe.bin has been added with a random MAC address 00:11:22:33:44:55
No support to intel wifi and bluetooth
./cbfstool x200m4rc0.rom add-int -i 1000 -n etc/boot-menu-wait has been already applied to reduce the waiting time
added flashregion_0_flashdescriptor.bin from libreboot
ich9fdgbe_8m.bin with 00:11:22:33:44:55 mac address
No secondary payloads added
capable to boot any linux, bsd and windows
to flash it
sudo flashrom -p internal -w x200m4rc0.rom -V
or
sudo flashrom -p internal:laptop=force_I_want_a_brick -w x200m4rc0.rom -V
To see how this (or my others built images) works, just have a look into my youtube https://www.youtube.com/user/marcolinoxz