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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 R400</title>
+</head>
+
+<body>
+
+ <div class="section">
+ <h1 id="pagetop">ThinkPad R400</h1>
+
+ <p</p>
+
+ <p>
+ It is believed that all R400 laptops are compatible.
+ </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 R400 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>
+
+ <p>
+ Usual limitations apply for native graphics initialization
+ (no VBT and/or INT10H and only GRUB works so no BIOS, so no DOS/Windows support
+ - who cares? There is no system but GNU, and Linux is one of it's kernels).
+ </p>
+
+ <p>
+ When connecting the AC adapter while system is powered off, system will then power on.
+ This probably happens in coreboot aswell (with or without blobs).
+ It's a minor annoyance, but it should be fixed (if it's not already fixed by now).
+ </p>
+
+ <p>
+ This method of disabling the ME leaves the flash descriptor and gbe in place (non-functional data, fully documented)
+ and disables the ME using soft straps. This means that the gigabit ethernet will still work (putting the machine in
+ non-descriptor mode would wipe it out).
+ </p>
+
+ <div class="subsection">
+ <h3 id="hwvirt">Hardware virtualization (vt-x)</h3>
+ <p>
+ The R400, 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>
+ 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>
+ Copyright &copy; 2014, 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>