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---
title: Flashing the ThinkPad R400
x-toc-enable: true
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Initial flashing instructions for R400.
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This guide is for those who want osboot on their ThinkPad R400 while
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they still have the original Lenovo BIOS present. This guide can also be
followed (adapted) if you brick your R400, to know how to recover.
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Before following this section, please make sure to setup your osboot
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ROM properly first. Although ROM images are provided pre-built in
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osboot, there are some modifications that you need to make to the one
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you chose before flashing. (instructions referenced later in this guide)
Serial port {#serial_port}
-----------
EHCI debug might not be needed. It has been reported that the docking
station for this laptop has a serial port, so it might be possible to
use that instead.
A note about CPUs
=================
[ThinkWiki](http://www.thinkwiki.org/wiki/Category:R400) has a list of
CPUs for this system. The Core 2 Duo P8400 and P8600 are believed to
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work in osboot. The Core 2 Duo T9600 was confirmed to work, so the
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T9400 probably also works. *The Core 2 Duo T5870/5670 and Celeron M
575/585 are untested!*
Quad-core CPUs
--------------
Incompatible. Do not use.
A note about GPUs
=================
Some models have an Intel GPU, while others have both an ATI and an
Intel GPU; this is referred to as "Dual Graphics" (previously
"switchable graphics"). In the *BIOS setup* program for lenovobios,
you can specify that the system will use one or the other (but not
both).
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osboot is known to work on systems with only the Intel GPU, using
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native graphics initialization. On systems with switchable graphics, the
Intel GPU is used and the ATI GPU is disabled, so native graphics
initialization works all the same.
CPU paste required
==================
See [\#paste](#paste).
Flash chip size {#flashchips}
===============
Use this to find out:
flashrom -p internal
MAC address {#macaddress}
===========
Refer to [mac\_address.md](../hardware/mac_address.md).
External flashing
=================
Refer to [spi.md](spi.md) as a guide for external re-flashing.
Disassembly
-----------
Remove all screws:\
![](https://av.libreboot.org/r400/0000.jpg)\
Remove the HDD and optical drive:\
![](https://av.libreboot.org/r400/0001.jpg)\
Remove the hinge screws:\
![](https://av.libreboot.org/r400/0002.jpg) ![](https://av.libreboot.org/r400/0003.jpg)
Remove the palm rest and keyboard:\
![](https://av.libreboot.org/r400/0004.jpg) ![](https://av.libreboot.org/r400/0005.jpg)
Remove these screws, and then remove the bezel:\
![](https://av.libreboot.org/r400/0006.jpg) ![](https://av.libreboot.org/r400/0007.jpg)
Remove the speaker screws, but don't remove the speakers yet (just set
them loose):\
![](https://av.libreboot.org/r400/0008.jpg) ![](https://av.libreboot.org/r400/0009.jpg)
![](https://av.libreboot.org/r400/0010.jpg)
Remove these screws, and then remove the metal plate:\
![](https://av.libreboot.org/r400/0011.jpg) ![](https://av.libreboot.org/r400/0012.jpg)
![](https://av.libreboot.org/r400/0013.jpg)
Remove the antennas from the wifi card, and then start unrouting them:\
![](https://av.libreboot.org/r400/0014.jpg) ![](https://av.libreboot.org/r400/0015.jpg)
![](https://av.libreboot.org/r400/0016.jpg) ![](https://av.libreboot.org/r400/0017.jpg)
![](https://av.libreboot.org/r400/0018.jpg) ![](https://av.libreboot.org/r400/0019.jpg)
Disconnect the LCD cable from the motherboard:\
![](https://av.libreboot.org/r400/0020.jpg) ![](https://av.libreboot.org/r400/0021.jpg)
![](https://av.libreboot.org/r400/0022.jpg) ![](https://av.libreboot.org/r400/0023.jpg)
Remove the hinge screws, and then remove the LCD panel:\
![](https://av.libreboot.org/r400/0024.jpg) ![](https://av.libreboot.org/r400/0025.jpg)
![](https://av.libreboot.org/r400/0026.jpg) ![](https://av.libreboot.org/r400/0027.jpg)
Remove this:\
![](https://av.libreboot.org/r400/0028.jpg) ![](https://av.libreboot.org/r400/0029.jpg)
Remove this long cable (there are 3 connections):\
![](https://av.libreboot.org/r400/0030.jpg) ![](https://av.libreboot.org/r400/0031.jpg)
![](https://av.libreboot.org/r400/0032.jpg) ![](https://av.libreboot.org/r400/0033.jpg)
Disconnect the speaker cable, and remove the speakers:\
![](https://av.libreboot.org/r400/0034.jpg)
Remove the heatsink screws, remove the fan and then remove the
heatsink/fan:\
![](https://av.libreboot.org/r400/0035.jpg) ![](https://av.libreboot.org/r400/0036.jpg)
![](https://av.libreboot.org/r400/0037.jpg) ![](https://av.libreboot.org/r400/0038.jpg)
Remove the NVRAM battery:\
![](https://av.libreboot.org/r400/0039.jpg) ![](https://av.libreboot.org/r400/0040.jpg)
Remove this screw:\
![](https://av.libreboot.org/r400/0041.jpg) ![](https://av.libreboot.org/r400/0042.jpg)
Disconnect the AC jack:\
![](https://av.libreboot.org/r400/0043.jpg) ![](https://av.libreboot.org/r400/0044.jpg)
Remove this screw and then remove what is under it:\
![](https://av.libreboot.org/r400/0045.jpg)
Remove this:\
![](https://av.libreboot.org/r400/0046.jpg)
Lift the motherboard (which is still inside the cage) from the side on
the right, removing it completely:\
![](https://av.libreboot.org/r400/0047.jpg) ![](https://av.libreboot.org/r400/0048.jpg)
Remove all screws, marking each hole so that you know where to re-insert
them. You should place the screws in a layout corresponding to the order
that they were in before removal: ![](https://av.libreboot.org/r400/0049.jpg)
![](https://av.libreboot.org/r400/0050.jpg)
Remove the motherboard from the cage, and the SPI flash chip will be
next to the memory slots:\
![](https://av.libreboot.org/r400/0051.jpg) ![](https://av.libreboot.org/r400/0052.jpg)
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Now, you should be ready to install osboot.
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Read [this article](spi.md) to learn how you may flash the chip, which is near
to the RAM.
Thermal paste (IMPORTANT)
=========================
Because part of this procedure involved removing the heatsink, you will
need to apply new paste. Arctic MX-4 is ok. You will also need isopropyl
alcohol and an anti-static cloth to clean with.
When re-installing the heatsink, you must first clean off all old paste
with the alcohol/cloth. Then apply new paste. Arctic MX-4 is also much
better than the default paste used on these systems.
![](https://av.libreboot.org/t400/paste.jpg)
NOTE: the photo above is for illustration purposes only, and does not
show how to properly apply the thermal paste. Other guides online detail
the proper application procedure.
Memory
======
In DDR3 machines with Cantiga (GM45/GS45/PM45), northbridge requires sticks
that will work as PC3-8500 (faster PC3/PC3L sticks can work as PC3-8500).
Non-matching pairs may not work. Single module (meaning, one of the slots
will be empty) will currently only work in slot 0.
NOTE: according to users reports, non matching pairs (e.g. 1+2 GiB) might
work in some cases.
Make sure that the RAM you buy is the 2Rx8 configuration when buying 4GiB sticks
(In other words: maximum of 2GiB per rank, 2 ranks per card).
[This page](http://www.forum.thinkpads.com/viewtopic.php?p=760721) might
be useful for RAM compatibility info (note: coreboot raminit is
different, so this page might be BS)
The following photo shows 8GiB (2x4GiB) of RAM installed:\
![](https://av.libreboot.org/t400/memory.jpg)
Boot it!
--------
You should see something like this:
![](https://av.libreboot.org/t400/boot0.jpg) ![](https://av.libreboot.org/t400/boot1.jpg)
Now [install GNU+Linux](../gnulinux/).