ThinkPad T400

It is believed that all T400 laptops are compatible.

There are two possible flash chip sizes for the R400: 4MiB (32Mbit) or 8MiB (64Mbit). This can be identified by the type of flash chip below the palmrest: 4MiB is SOIC-8, 8MiB is SOIC-16.

The T400 laptops come with the ME (and sometimes AMT in addition) before flashing libreboot. Libreboot disables and removes it by using a modified descriptor: see gm45_remove_me.html (contains notes, plus instructions)

Flashing instructions can be found at ../install/index.html#flashrom

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Thi T400 is almost identical to the X200, code-wise. See x200.html.

Hardware register dumps

The coreboot wiki shows how to collect various logs useful in porting to new boards. Following are outputs from the T400:

• T400 with Winbond W25X64 flash chip (8MiB, SOIC-16) and Lenovo BIOS 2.02 (EC firmware 1.01):
  • lspci output
  • lsusb output
  • superiotool output
  • inteltool output
  • ectool output
  • msrtool output, errors
  • dmidecode output
  • biosdecode output
  • nvramtool output
  • dmesg
  • flashrom probe output, errors
  • flashrom read output, errors
  • /sys/class/sound/card0/hwC0D0/init_pin_configs
  • /proc/asound/card0/codec#0
  • /proc/cpuinfo
  • t400_flashrom_read_with_bbb.txt
  • t400_flashrom_read_with_bbb.txt
• Version of flashrom used for the external flashing/reading logs is the one that libreboot git revision c164960 uses.

Copyright © 2015 Francis Rowe <info@gluglug.org.uk>
This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions. A copy of the license can be found at ../license.txt.

This document is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See ../license.txt for more information.