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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
@import url('../css/main.css');
</style>
<title>ThinkPad T400</title>
</head>
<body><div class="section"><p>If you're using libreboot from git, note that only CrOS devices build at the moment. We merged a newly rewritten build system recently, and we've yet to complete re-integration of older boards into Libreboot. Use Libreboot 20160907 for the time being, unless you're involved in libreboot development</p></div>
<div class="section">
<h1 id="pagetop">ThinkPad T400</h1>
<p>
It is believed that all or most T400 laptops are compatible.
See notes about <a href="../install/t400_external.html#cpu_compatibility">CPU compatibility</a>
for potential incompatibilities.
</p>
<p>
There are two possible flash chip sizes for the T400: 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.
</p>
<p>
<b>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 <a href="gm45_remove_me.html">gm45_remove_me.html</a></b> (contains notes, plus
instructions)
</p>
<p>
Flashing instructions can be found at <a href="../install/#flashrom">../install/#flashrom</a>
</p>
<p>
<a href="./">Back to previous index</a>.
</p>
</div>
<div class="section">
<h1 id="ecupdate">EC update</h1>
<p>
It is recommended that you update to the latest EC firmware version.
The <a href="https://libreboot.org/faq/#firmware-ec">EC firmware</a>
is separate from libreboot, so we don't actually provide that, but
if you still have Lenovo BIOS then you can just run the Lenovo BIOS
update utility, which will update both the BIOS and EC version.
See:
</p>
<ul>
<li><a href="https://libreboot.org/docs/install/index.html#flashrom">https://libreboot.org/docs/install/index.html#flashrom</a></li>
<li><a href="http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk">http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk</a></li>
</ul>
<p>
NOTE: this can only be done when you are using Lenovo BIOS. How to
update the EC firmware while running libreboot is unknown.
Libreboot only replaces the BIOS firmware, not EC.
</p>
<p>
Updated EC firmware has several advantages e.g.
bettery battery handling.
</p>
</div>
<div class="section">
<h2 id="compatibility_noblobs">Compatibility (without blobs)</h2>
<div class="subsection">
<h3 id="hwvirt">Hardware virtualization (vt-x)</h3>
<p>
The T400, when run without CPU microcode updates in coreboot, currently kernel panics
if running QEMU with vt-x enabled on 2 cores for the guest. With a single core enabled
for the guest, the guest panics (but the host is fine). Working around this in QEMU
might be possible; if not, software virtualization should work fine (it's just slower).
</p>
<p>
On GM45 hardware (with libreboot), make sure that the <i>kvm</i> and <i>kvm_intel</i> kernel modules
are not loaded, when using QEMU.
</p>
<p>
The following errata datasheet from Intel might help with investigation:
<a href="http://download.intel.com/design/mobile/specupdt/320121.pdf">http://download.intel.com/design/mobile/specupdt/320121.pdf</a>
</p>
</div>
</div>
<div class="section">
<p>
The T400 is almost identical to the X200, code-wise. See <a href="x200.html">x200.html</a>.
</p>
</div>
<div class="section">
<h2 id="regdumps">Hardware register dumps</h2>
<p>
The coreboot wiki <a href="http://www.coreboot.org/Motherboard_Porting_Guide">shows</a>
how to collect various logs useful in porting to new
boards. Following are outputs from the T400:
</p>
<ul>
<li>
T400 with <b>Winbond W25X64</b> flash chip (8MiB, SOIC-16)
and Lenovo BIOS 2.02 (EC firmware 1.01):
<ul>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/">../future/dumps/logs-t400-bios2.02-ec1.01/</a></li>
</ul>
</li>
<li>
Version of flashrom used for the external flashing/reading logs is the one that libreboot git revision c164960 uses.
</li>
</ul>
</div>
<div class="section">
<p>
Copyright © 2015 Leah Rowe <info@minifree.org><br/>
Permission is granted to copy, distribute and/or modify this document
under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license
or any later version published by Creative Commons;
A copy of the license can be found at <a href="../cc-by-sa-4.0.txt">../cc-by-sa-4.0.txt</a>
</p>
<p>
Updated versions of the license (when available) can be found at
<a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode">https://creativecommons.org/licenses/by-sa/4.0/legalcode</a>
</p>
<p>
UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
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