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<!DOCTYPE html>
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<style type="text/css">
@import url('../css/main.css');
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<title>ThinkPad T400</title>
</head>
<body>
<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/index.html#flashrom">../install/index.html#flashrom</a>
</p>
<p>
<a href="index.html">Back to previous index</a>.
</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">
<h1 id="lcd_compatibility">LCD compatibly</h1>
<p>
Not all LCD panels are compatible yet. See <a href="gm45_lcd.html">gm45_lcd.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 Woods <info@minifree.org><br/>
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license can be found at <a href="../gfdl-1.3.txt">../gfdl-1.3.txt</a>
</p>
<p>
Updated versions of the license (when available) can be found at
<a href="https://www.gnu.org/licenses/licenses.html">https://www.gnu.org/licenses/licenses.html</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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