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authorFrancis Rowe <info@gluglug.org.uk>2015-03-31 18:00:28 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-03-31 18:07:35 (EDT)
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ThinkPad T500 support
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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 &copy; 2015 Francis Rowe &lt;info@gluglug.org.uk&gt;<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>