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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">
<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>
Note 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>lspci <a href="../future/dumps/logs-t400-bios2.02-ec1.01/lspci.log">output</a></li>
<li>lsusb <a href="../future/dumps/logs-t400-bios2.02-ec1.01/lsusb.log">output</a></li>
<li>superiotool <a href="../future/dumps/logs-t400-bios2.02-ec1.01/superiotool.log">output</a></li>
<li>inteltool <a href="../future/dumps/logs-t400-bios2.02-ec1.01/inteltool.log">output</a></li>
<li>ectool <a href="../future/dumps/logs-t400-bios2.02-ec1.01/ectool.log">output</a></li>
<li>msrtool <a href="../future/dumps/logs-t400-bios2.02-ec1.01/msrtool.log">output</a>,
<a href="../future/dumps/logs-t400-bios2.02-ec1.01/msrtool.err">errors</a></li>
<li>dmidecode <a href="../future/dumps/logs-t400-bios2.02-ec1.01/dmidecode.log">output</a></li>
<li>biosdecode <a href="../future/dumps/logs-t400-bios2.02-ec1.01/biosdecode.log">output</a></li>
<li>nvramtool <a href="../future/dumps/logs-t400-bios2.02-ec1.01/nvramtool.log">output</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/dmesg.log">dmesg</a></li>
<li>flashrom probe <a href="../future/dumps/logs-t400-bios2.02-ec1.01/flashrom_info.log">output</a>,
<a href="../future/dumps/logs-t400-bios2.02-ec1.01/flashrom_info.err">errors</a></li>
<li>flashrom read <a href="../future/dumps/logs-t400-bios2.02-ec1.01/flashrom_read.log">output</a>,
<a href="../future/dumps/logs-t400-bios2.02-ec1.01/flashrom_read.err">errors</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/pin_hwC0D0">/sys/class/sound/card0/hwC0D0/init_pin_configs</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/codec%230">/proc/asound/card0/codec#0</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/cpuinfo.log">/proc/cpuinfo</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/t400_flashrom_read_with_bbb.txt">t400_flashrom_read_with_bbb.txt</a></li>
<li><a href="../future/dumps/logs-t400-bios2.02-ec1.01/t400_flashrom_write_with_bbb.txt">t400_flashrom_write_with_bbb.txt</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 Francis Rowe <info@gluglug.org.uk><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
AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF
ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS,
IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION,
WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR
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ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT
KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT
ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.
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<p>
TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE
TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION,
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