bonds
/
libreboot
forked from libreboot/obsolete-repository-preserved-for-historical-purposes


			
				
					
						
						
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	<title>ThinkPad T500</title>
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<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>
				for potential incompatibilities.
			</p>
			
			<p>
				There are two possible flash chip sizes for the T500: 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">

		<h2 id="compatibility_noblobs">Compatibility (without blobs)</h2>

			<div class="subsection">
				<h3 id="hwvirt">Hardware virtualization (vt-x)</h3>
					<p>
						The T500, 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 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>Macronix MX25L3205D</b> flash chip (4MiB, SOIC-8)
				and Lenovo BIOS 3.13 7VET83WW (EC firmware 1.06):
				<ul>
					<li><a href="../future/dumps/t500log/">../future/dumps/t500log/</a></li>
				</ul>
			</li>
		</ul>

	</div>

	<div class="section">

		<p>
			Copyright &copy;  2015 Leah Rowe &lt;info@minifree.org&gt;<br/>
			Permission is granted to copy, distribute and/or modify this document
			under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license
			or any later version published by Creative Commons;
			
			A copy of the license can be found at <a href="../cc-by-sa-4.0.txt">../cc-by-sa-4.0.txt</a>
		</p>

		<p>
			Updated versions of the license (when available) can be found at
			<a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode">https://creativecommons.org/licenses/by-sa/4.0/legalcode</a>
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		<p>
			UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
			EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
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