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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 T500</title>
</head>
<body>
<div class="section">
<h1 id="pagetop">ThinkPad T500</h1>
<p>
It is believed that all or most T500 laptops are compatible.
See notes about <a href="../install/t500_external.html#cpu_compatibility">CPU compatibility</a>
and <a href="../install/t500_external.html#switchable_graphics">switchable graphics</a> for
potential incompatibilities.
</p>
<p>
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.
</p>
<p>
<b>The T500 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">
<p>
Thi T500 is almost identical to the X200, code-wise. See <a href="x200.html">x200.html</a>.
</p>
</div>
<div class="section">
<h2 id="descriptor_difference">
Descriptor and Gbe differences
</h2>
<p>
See
<a href="../future/dumps/t500_x200_descriptor/descriptor_diff_t500_x200.txt">../future/dumps/t500_x200_descriptor/descriptor_diff_t500_x200.txt</a>
and
<a href="../future/dumps/t500_x200_descriptor/gbe_diff_t500_x200.txt">../future/dumps/t500_x200_descriptor/gbe_diff_t500_x200.txt</a>
</p>
<p>
The patches above are based on the output from ich9deblob on a factory.rom image dumped from the T500
with a SOIC-8 4MiB flash chip. The patch re-creates the X200 descriptor/gbe source, so the commands were
something like:<br/>
$ <b>diff -u t500gbe x200gbe</b><br/>
$ <b>diff -u t500descriptor x200descriptor</b>
</p>
<p>
ME VSCC table is in a different place and a different size on the T500. Libreboot disables and removes the ME
anyway, so it doesn't matter.
</p>
<p>
The very same descriptor/gbe used on the X200 (generated by <a href="gm45_remove_me.html#ich9gen">ich9gen</a>)
was re-used on the T500, and it still worked.
</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 T500:
</p>
<ul>
<li>
T500 with <b>TODO: PUT FLASH CHIP HERE</b> flash chip (4MiB, SOIC-8)
and <b>TODO: PUT BIOS/EC VERSION HERE</b>:
<ul>
<li>TODO: put logs here</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="../license.txt">../license.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="../license.txt">../license.txt</a> for more information.
</p>
</div>
</body>
</html>
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