WIP: Add E6400 documentation
Nicholas Chin
Leah Rowe
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---
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title: Latitude E6400
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x-toc-enable: true
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...
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<div class="specs">
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<center>
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{width=200px}
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</center>
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| ***Specifications*** | |
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|----------------------------|------------------------------------------------|
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| **Manufacturer** | Dell |
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| **Name** | Latitude E6400 |
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| **Released** | 2009 |
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| **Chipset** | Intel Cantiga GM45 |
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| **CPU** | Intel Core 2 Duo (Penryn family). A Quad-core
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mod exists, replacing the Core 2 Duo with a Core Quad |
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| **Graphics** | Intel GMA 4500MHD (and ATI Mobility Radeon HD
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3650 on some models) |
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| **Display** | 1280x800/1440x900 TFT |
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| **Memory** | 2 or 4GB (Upgradable to 8GB) |
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| **Architecture** | x86_64 |
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| **EC** | SMSC MEC5035 with proprietary firmware |
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| **Original boot firmware** | Dell BIOS |
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| **Intel ME/AMD PSP** | Present. Can be completely disabled. |
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| **Flash chip** | SOIC-8 4MiB or 2MiB+4MiB (Upgradable to 16MiB) |
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```
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W+: Works without blobs;
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N: Doesn't work;
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W*: Works with blobs;
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U: Untested;
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P+: Partially works;
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P*: Partially works with blobs
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```
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| ***Features*** | |
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|---------------------------------------------------|----|
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| **Internal flashing with original boot firmware** | W+ |
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| **Display** | W+ |
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| **Audio** | W+ |
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| **RAM Init** | W+ |
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| **External output** | W+ |
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| **Display brightness** | P+ |
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| ***Payloads supported*** | |
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|---------------------------|-----------|
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| **GRUB** | Works |
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| **SeaBIOS** | Works |
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| **SeaBIOS with GRUB** | Works |
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</div>
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Introduction
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============
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It is believed that all or most laptops of the model T400 are compatible. See notes
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about [CPU
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compatibility](../install/t400_external.html#cpu_compatibility) for
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potential incompatibilities.
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There are two possible flash chip sizes for the E6400: 4MiB (32Mbit) or
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2+4MiB (64Mbit).
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*The E6400 laptops may come with the ME (and sometimes AMT in addition) before
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flashing libreboot. Dell also sold configurations with the ME completely
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disabled, identifiable by a yellow sticker reading "3 ME Disabled" inside the
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bottom panel. This config sets the MeDisable bit in the IFD and sets the ME
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region almost entirely to 1's, with the occasional 32-bit value (likely not
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executable). libreboot disables and removes it by using a modified descriptor:
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see [../install/ich9utils.md](../install/ich9utils.md)*
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(contains notes, plus instructions)
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Flashing instructions can be found at
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[../install/\#flashrom](../install/#flashrom)
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EC update {#ecupdate}
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=========
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It is recommended that you update to the latest EC firmware version. The
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[EC firmware](../../faq.md#ec-embedded-controller-firmware) is separate from
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libreboot, so we don't actually provide that, but if you still have
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Lenovo BIOS then you can just run the Lenovo BIOS update utility, which
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will update both the BIOS and EC version. See:
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- [../install/#flashrom](../install/#flashrom)
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- <http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk>
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NOTE: this can only be done when you are using Lenovo BIOS. How to
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update the EC firmware while running libreboot is unknown. libreboot
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only replaces the BIOS firmware, not EC.
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Updated EC firmware has several advantages e.g. bettery battery
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handling.
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The T400 is almost identical to the X200, code-wise. See
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[x200.md](x200.md).
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---
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title: Flashing the Latitude E6400
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x-toc-enable: true
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...
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Initial flashing instructions for the E6400.
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This guide is for those who want libreboot on their Latitude E6400 while
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they still have the original Dell BIOS present. This guide can also be
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followed (adapted) if you brick your E6400, to know how to recover.
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A
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["HMM"](https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/43y6629_05.pdf#page=386)
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(Hardware Maintenance Manual) detailing the process of [dis]assembly
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is available for this model. Be careful when reassembling the laptop as
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the screws on page 114 (with title "1130 Keyboard bezel") are swapped
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and if you follow the HMM you will punch a hole through the bezel in the
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upper right corner.
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Serial port {#serial_port}
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-----------
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EHCI debug might not be needed. It has been reported that the docking
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station for this laptop has a serial port, so it might be possible to
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use that instead.
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A note about CPUs
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=================
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[ThinkWiki](http://www.thinkwiki.org/wiki/Category:T400) has a list of
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CPUs for this system. The Core 2 Duo P8400, P8600 and P8700 are believed
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to work in libreboot.
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T9600, T9500, T9550 and T9900 are all compatible, as reported by users.
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Quad-core CPUs
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--------------
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Very likely to be compatible, but requires hardware modification.
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Based on info from German forum post about installing Core Quad CPU on T500 found in coreboot mailing list. Currently work in progress and no guide available.
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- [Coreboot mailing list post](https://mail.coreboot.org/pipermail/coreboot/2016-November/082463.html)
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- [German forum post about install Core Quad on T500](https://thinkpad-forum.de/threads/199129)
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A note about GPUs
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=================
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Some models have an Intel GPU, while others have both an ATI and an
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Intel GPU; this is referred to as "switchable graphics". In the *BIOS
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setup* program for lenovobios, you can specify that the system will use
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one or the other (but not both).
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libreboot 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
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Intel GPU is used and the ATI GPU is disabled, so native graphics
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initialization works all the same.
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CPU paste required
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==================
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See [\#paste](#paste).
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Flash chip size {#flashchips}
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===============
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Use this to find out:
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flashrom -p internal
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MAC address {#macaddress}
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===========
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Refer to [mac\_address.md](../hardware/mac_address.md).
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How to flash internally
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========================
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How to flash externally
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=========================
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Refer to [spi.md](spi.md) as a guide for external re-flashing.
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The SPI flash chip shares a voltage rail with the ICH9 southbridge, which is
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not isolated using a diode. As a result, powering the flash chip externally
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causes the ICH9 to partially power up and attempt to drive the SPI clock pin
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low, which can interfere with programmers such as the Raspberry Pi. See
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[RPi Drive Strength](spi.md#rpi-drive-strength) for a workaround.
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The procedure
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-------------
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Thermal paste (IMPORTANT)
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=========================
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Because part of this procedure involved removing the heatsink, you will
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need to apply new paste. Arctic MX-4 is ok. You will also need isopropyl
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alcohol and an anti-static cloth to clean with.
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When re-installing the heatsink, you must first clean off all old paste
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with the alcohol/cloth. Then apply new paste. Arctic MX-4 is also much
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better than the default paste used on these systems.
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NOTE: the photo above is for illustration purposes only, and does not
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show how to properly apply the thermal paste. Other guides online detail
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the proper application procedure.
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Memory
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======
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In DDR3 machines with Cantiga (GM45/GS45/PM45), northbridge requires sticks
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that will work as PC3-8500 (faster PC3/PC3L sticks can work as PC3-8500).
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Non-matching pairs may not work. Single module (meaning, one of the slots
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will be empty) will currently only work in slot 0.
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NOTE: according to users reports, non matching pairs (e.g. 1+2 GiB) might
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work in some cases.
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Make sure that the RAM you buy is the 2Rx8 configuration when buying 4GiB sticks
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(In other words: maximum of 2GiB per rank, 2 ranks per card).
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[This page](http://www.forum.thinkpads.com/viewtopic.php?p=760721) might
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be useful for RAM compatibility info (note: coreboot raminit is
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different, so this page might be BS)
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The following photo shows 8GiB (2x4GiB) of RAM installed:\
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Boot it!
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--------
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You should see something like this:
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Now [install Linux](../linux/).
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