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All of the Dell Latitude models can be flashed internally, which means that you do not need to disassemble them. You can do it from Linux/BSD, using the instructions on this page.

SAFETY WARNING: Always insert vendor files before flashing., or look directly at Injecting Vendor Files. If you flash Libreboot without inserting vendor files, you will brick the machine; if you do, please follow the external flashing instructions linked below.

Please also disable /dev/mem protection, otherwise flashprog and dell-flash-unlock won’t work. You can re-enable the protections after flashing.

Please also disable SecureBoot, if you’re using a UEFI-based Dell Latitude. Note that Libreboot does not currently implement UEFI on x86 platforms, but you can set up Secure libreBoot after flashing.

Make sure to set your own MAC address in the ROM image before flashing. Please read the nvmutil manual which says how to do this.

Thermal safety: this machine shuts down very quickly, when the machine exceeds 80c CPU temperature, which is far more conservative than on most laptops (non-Dell ones), so you should make sure that your thermals are excellent. More info available here. This is a known bug, but otherwise the machine will be mostly stable.

Vendor files not required for Dell Latitude E6400 if you have the Intel GPU.

If you have the Nvidia model, please use the e6400nvidia_4mb target, and make sure to run the inject script.

See: https://codeberg.org/libreboot/lbmk/issues/14#issuecomment-907758

If using Linux on Nvidia GPU variants of E6400, please boot using nomodeset. The nv drivers on BSD systems generally work, but can have severe performance issues; use of a tiling window manager is recommended, on BSD systems, because moving windows around can literally lag a lot otherwise, on most window managers.

On everything except E6400, Libreboot only supports the variant with an Intel GPU. Therefore, you must only purchase a Dell Latitude that has the Intel graphics; even on E6400, this is good advice, due to issues with the Nvidia GPU on E6400, documented later in this guide.

You can simply boot Linux/BSD, on the Dell Latitude you wish to flash, and run flashprog from there, for Libreboot installation. Certain other steps are also required, documented in the steps below:

You can flash Libreboot directly from the vendor (Dell) BIOS, without taking the machine apart. It can be done entirely from Linux/BSD.

NOTE (15 October 2023): The util is now called dell-flash-unlock, but it was previously called e6400-flash-unlock. Links have been updated.

Check util/dell-flash-unlock in the lbmk.git repository, or in release archives for Libreboot releases from 20230423 onwards.

Go in there:

cd util/dell-flash-unlock
make

With this program, you can unlock the flash in such a way where everything is writeable. Information about how to use it is in the README.html file which is included in that program’s directory, or you can read it online here:

https://browse.libreboot.org/lbmk.git/plain/util/dell-flash-unlock/README.md

Please make sure that you do fully read the README, because it contains useful information.

Literally just run that program, and do what it says. You run it once, and shut down, and when you do, the system brings itself back up automatically; on some systems, you have to boot the machine back up manually, after power down. Then you run it and flash it unlocked. Then you run it again. The source code is intuitive enough that you can easily get the gist of it; it’s writing some EC commands and changing some chipset config bits. The EC on this machine is hooked up to the GPIO33 signal, sometimes called HDA_DOCK_EN, which sets the flash descriptor override thus disabling any flash protection by the IFD. It also bypasses the SMM BIOS lock protection by disabling SMIs, and Dell’s BIOS doesn’t set any other type of protection either such as writing to Protected Range registers.

MAKE SURE to back up the original firmware image first:

flashprog -p internal -r factory.rom

When you flash it, you can use this command:

flashprog -p internal -w libreboot.rom

Where libreboot.rom is your Dell Latitude ROM. Make sure it’s the right one. If flashprog complains about multiple flash chips detected, just pick one of them (doesn’t matter which one). On most Dell machines, the most correct would probably be this option in flashprog: -c MX25L3205D/MX25L3208D.

So:

flashprog -p internal -w libreboot.rom -c MX25L3205D/MX25L3208D

When you see flashprog say VERIFIED at the end, that means the flash was successful. If you don’t see that, or you’re unsure, please contact the Libreboot project via IRC.

Machine-specific disassembly instructions not provided, but you can find the hardware maintenance manual for your Latitude module online. Just search for it. The flash chips(s) is/are usually under the keyboard/palmrest. Near to the PCH/southbridge.

Note that you often have to provide a high current for VCC, because the flash chip will share a common voltage rail with other power-hungry ICs on the board, or the flash ICs will share a common MISO/MOSI line without resistance, with chip selects controlled by PCH, and/or the PCH itself might be live while flashing - so you need to set the drive strength high.

Take stock of the above advice, which is also mentioned on the external SPI flashing guide.

Please read the external SPI flash guide

External flashing is usually not required, on these machines.

SOme Dell Latitudes use a single flash chip, so you can just use the ROM images as-is.

If there are two flash chips, you must split the ROM images. Check the silk screen on the board, and the first chip might be labelled something like SPI1, second one SPI2. Figure out which one is first.

Look at the part number on the chip and find the flash size for it. For example: a 10MB flash might be 2MB for SPI1 and 8MB for SPI2, so you would do:

dd if=libreboot.rom of=spi1.rom bs=1M count=2
dd if=libreboot.rom of=spi2.rom bs=1M skip=2

Adapt accordingly, to the exact flash configuration on your machine. 16MB is likely one chip. 12MB is usually SPI1 8MB and SPI2 4MB so you would do:

dd if=libreboot.rom of=spi1.rom bs=1M count=8
dd if=libreboot.rom of=spi2.rom bs=1M skip=8

If in doubt, just ask on Libreboot IRC.

Markdown file for this page: https://libreboot.org/docs/install/latitude.md

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