95 lines
3.9 KiB
Markdown
95 lines
3.9 KiB
Markdown
---
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title: ThinkPad T440p external flashing
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x-toc-enable: true
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...
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Read the [Ivybridge/Haswell common guide](/docs/install/ivy_has_common.html) if you want more information.
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All of the following instructions assume that you've cloned lbmk and are operating from the
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root of that project. To do so, run
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git clone https://codeberg.org/libreboot/lbmk
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cd lbmk
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You can now follow the rest of the instructions.
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Preparing a release Rom
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-----------------------
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You must patch the release rom with the necessary blobs *and then* flash it to your board.
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Lbmk includes a script that will automatically inject the necessary blobs into a rom file.
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The script can determine the board automatically if you have not changed the name, but you can also manually set the board name with the `-b` flag.
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In order to inject the necessary blobs into a rom image, run the script from the root of lbmk and point to the rom image.
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If you only wish to flash a release rom then the process of injecting the necessary blobs is quite simple.
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Run the injection script pointing to the release archive you downloaded:
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./blobutil inject /path/to/libreboot-20230319-18-g9f76c92_t440_12mb.tar.xz
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The script can automatically detect the board as long as you do not change the file name.
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You can then find flash-ready ROMs in `/bin/release/`
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Alternatively, you may patch only a single rom file.
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For example (libre replacement of `mrc.bin`):
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./blobutil inject -r t440p_libreboot.rom -b t440p_12mb
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Optionally, you can use this script to modify the mac address of the rom with the `-m` flag.
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For example:
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./blobutil inject -r t440p_libreboot.rom -b t440p_12mb -m 00:f6:f0:40:71:fd
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If you're flashing a ROM that needs blob `mrc.bin`, you would do one of these
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instead, for example:
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./blobutil inject -r t440p_libreboot.rom -b t440pmrc_12mb
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or (inserting a different MAC address)
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./blobutil inject -r t440p_libreboot.rom -b t440pmrc_12mb -m 00:f6:f0:40:71:fd
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NOTE: this makes use of `nvmutil`, which you can read more about in
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the [nvmutil documentation](nvmutil.md).
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Splitting The Rom
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-----------------
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You can use `dd` to easily split your rom into the two separate portions for
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external flashing.
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dd if=libreboot.rom of=top.rom bs=1M skip=8
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dd if=libreboot.rom of=bottom.rom bs=1M count=8
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Flash the top chip with top.rom, and tho bottom chip with bottom.rom.
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Don't worry about knowing which chip is which on a standard setup; flashrom will let you know if the
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image size is incorrect for the chip you're flashing.
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Disassembly
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-----------
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Start by removing the back cover screws and the main battery.\
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<img tabindex=1 src="https://av.libreboot.org/board/t440p/t440p_back.jpg" /><span class="f"><img src="https://av.libreboot.org/board/t440p/t440p_back_orig.jpg" /></span>
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You can then remove the back cover by sliding it off.
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Next you need to:
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+ Unplug the cmos battery
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+ Unplug and unroute the fan cable
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+ Unplug and unroute the black LED cable
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+ Remove all visible screws
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*Note: the ultrabay screw will loosen, but not come out of the assembly*\
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<img tabindex=1 src="https://av.libreboot.org/board/t440p/t440p_nocover.jpg" /><span class="f"><img src="https://av.libreboot.org/board/t440p/t440p_nocover_orig.jpg" /></span>
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Now you can pull up around the sides of the bottom assembly to release it.
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Pull it upwards and lift it open to the front of the machine like a clamshell.
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Make sure not to break the wires connecting the assembly to the rest of the machine.\
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<img tabindex=1 src="https://av.libreboot.org/board/t440p/t440p_open.jpg" /><span class="f"><img src="https://av.libreboot.org/board/t440p/t440p_open_orig.jpg" /></span>
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You should now be able to see the two flash chips near the RAM.\
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<img tabindex=1 src="https://av.libreboot.org/board/t440p/t440p_chipLocation.jpg" /><span class="f"><img src="https://av.libreboot.org/board/t440p/t440p_chipLocation_orig.jpg" /></span>
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You can now proceed to [flashing](/docs/install/spi.html) this machine.
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