necklace
/
libreboot
forkad från libreboot/obsolete-repository-preserved-for-historical-purposes


			
				
					
						
						
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	<title>ThinkPad R400</title>
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<body>

	<div class="section">
		<h1 id="pagetop">ThinkPad R400</h1>
			
			<p>
				It is believed that all or most R400 laptops are compatible. 
				See notes about <a href="../install/r400_external.html#cpu_compatibility">CPU compatibility</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 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>

			<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>
						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 R400 is almost identical to the X200, code-wise. See <a href="x200.html">x200.html</a>.
		</p>
		
		<p>
			TODO: put hardware register logs here like on the <a href="x200.html">X200</a> and <a href="t400.html">T400</a> page.
		</p>

	</div>

	<div class="section">

		<h1 id="lcd_compatibility">LCD compatibly</h1>
			<p>
				Not all LCD panels are compatible yet. See <a href="gm45_lcd.html">gm45_lcd.html</a>.
			</p>

	</div>

	<div class="section">

		<p>
			Copyright &copy;  2014, 2015 Francis Rowe &lt;info@gluglug.org.uk&gt;<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>
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		<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>
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			UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
			EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
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			TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE
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