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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">
<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/>
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 <a href="../cc-by-sa-4.txt">../cc-by-sa-4.txt</a>.
</p>
<p>
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 <a href="../cc-by-sa-4.txt">../cc-by-sa-4.txt</a> for more information.
</p>
</div>
</body>
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