X200 Libreboot

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diff --git a/content/weblog/2022-10-23_x200-libreboot/index.md b/content/weblog/2022-10-23_x200-libreboot/index.md
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+title = "Liberating my X200"
+date = 2022-10-23T23:56:42
++++
+
+I had wanted to libreboot my trusty old Thinkpad X200 for quite sometime. Only
+recently did I get around to librebooting mine. Even though the information on
+how to do it is out there and quite good, some of it is spread throughout the
+internet and didn't all completely apply to my particular case, hence I decided
+to write this post on how I went about flashing Libreboot on my X200.
+
+<!-- more -->
+
+I had been wanting to flash Libreboot on my X200 ever since I got it, but only
+recently did I get around actually doing it. The process isn't hard at all, you
+don't need any special skills besides knowing how to use the Linux command line
+and not being afraid to open your laptop and connecting some wires to it.
+
+There's many reasons to want to install Libreboot or Coreboot, some which are
+faster boot times, custom payloads, and of course, muh freedumbs. I was mainly
+looking for faster boot times and having an almost completely free and open
+source laptop without backdoors, i.e. Intel ME[^1].
+
+For this I used a CH341A programmer. Yes, the official Libreboot site[^2] warns
+against using it, but really it just because of a batch of faulty boards that
+deliver 5V instead of 3.3V on the 3.3V pin. That said, if you have a multimeter
+lying around it quite easy to make sure that you have a proper CH341A with 3.3V
+DC instead of 5V. After plugging my multimeter I found that mine was fine and so
+I proceeded to use to flash my laptop.
+
+Most Thinkpads out there have 16 pin SPI chip, and that's why most information
+out there is about them, but mine had an 8 pin. In my case that was better for
+me, since the CH341A I bought came with a SOIC8 clip, so I didn't have to buy
+a separate clip. I did end up desoldering the cables that came attached to the
+clip since I wanted to use jumper female-female cables to connect the clip to
+the CH341A.
+
+[![Unsoldered SOIC8 clip](libreboot-01.jpg)](libreboot-01.jpg)
+<figcaption>
+
+Unsoldered SOIC8 clip next to the CH341A with jumper cables already connected to
+the board.
+</figcaption>
+
+After unsoldering the clip, I went ahead and opened my laptop. It's only
+necessary to remove the keyboard and palmrest to get access to the chip.
+Removing the keyboard and palmrest assembly is really easy. The only thing that
+you need to do is unscrew 8 phillip-head screws which are marked with the
+palmrest and the keyboard icons, the push the keyboard towards the screen pull
+it up, disconnect it and next lift off the palmrest. You might need to also
+disconnect the fingerprint reader if you have one, mine doesn't so I didn't have
+to. Also, don't forget to remove the laptop battery and disconnect the CMOS
+battery.
+
+[![Removing keyboard and palmrest](libreboot-02.jpg)](libreboot-02.jpg)
+<figcaption>
+
+Removing the keyboard and palmrest.
+</figcaption>
+
+After getting the keyboard and palmrest out of the way, there was the chip. All
+of those chips have a dot indicating pin 1. It's important to locate pin 1 in
+order to know how to properly connect the pins to the flashing board. The
+scheme is as follows:
+
+![Thinkpad X200 SOIC8 scheme](x200-soic8.svg)
+
+Wire all of the pins on the chip to the following pins on the CH341A:
+
+1. CS
+2. MISO/MIOS
+3. _unused_
+4. GND
+5. MOSI
+6. CLK
+7. _unused_
+8. 3.3V
+
+After wiring up properly the clip to the CH341A, I proceeded to secure the clip
+to the chip by making sure that pin 1 was correctly wired to CS on the CH341A.
+Then, after making sure that the clip was properly and securely in place, I
+proceeded to connect the CH341A to the host computer from which I would be
+flashing. **It's very important to first connect the clip and then the board to
+the host, otherwise you risk frying your chip and bricking your laptop!**
+
+[![CH341A connected to the chip](libreboot-03.jpg)](libreboot-03.jpg)
+<figcaption>
+
+CH341A connected to the chip and host computer.
+</figcaption>
+
+For reading and flashing SPI chips, a program called flashrom is needed, which
+is available in most distributions' repos.
+
+After I checked dmesg to see that the CH341A properly recognized by the host, I
+went ahead and proceeded to dump the original firmware. I did this twice to run
+a diff on both dumps and make sure that I was getting correct readings before
+actually flashing the Libreboot image:
+
+```
+# flashrom -p ch341a_spi -r bak1.rom
+...
+# flashrom -p ch341a_spi -r bak2.rom
+...
+# diff bak1.rom bak2.rom
+```
+
+I got an empty output from diff, which means that the two reads were
+identically, and so I could continue with more confidence that I wouldn't brick
+my laptop. Also, from the output, I could gather that my chip was a 4mb one, so
+the image that I downloaded was the 20220710 4mb release for the X200. All
+Libreboot images can be downloaded from here:
+<https://libreboot.org/download.html>.
+
+I chose to install the one with grub as first payload and SeaBios as secondary
+since I only use Linux. After choosing and downloading the image I proceeded to
+flash it: 
+
+```
+# flashrom -p ch341a_spi -w grub_x200_4mb_libgfxinit_corebootfb_usqwerty.rom
+```
+
+After a couple of minutes of flashing it was done. I was now able to fully enjoy
+muh freedumbs. I assembled back the computer and booted it up and there it was,
+the libreboot grub menu greeting me.
+
+Everything was fine until the computer froze, I rebooted it and was greeted by
+some weird noise on the screen and nothing else. I fiddled around, dumped the
+chip to check it was correctly flashed (it was), tried different images, until
+it dawned on me that I had two different RAM sticks on my X200, a 4GB one and a
+2GB one. After removing the 2GB one everything went back to normal.
+
+Libreboot/Coreboot does indeed boot much faster than the native firmware. It
+even wakes up instantaneously from sleep, whereas with the native firmware it
+would take 1-2s seconds to do so. I also noticed slightly better graphics
+performance, which could be attributed to the bigger amount of RAM that is
+dedicated to iGPU with Libreboot compared to the native firmware.
+
+[![X200 Libreboot grub menu](libreboot-04.jpg)](libreboot-04.jpg)
+<figcaption>
+
+Muh freedumbs!
+</figcaption>
+
+That's it, it really is that easy. After flashing Libreboot it is possible to
+flash the SPI chip using software only without having to use an external
+flasher. It's as simple as using the flashrom program, except that you use `-p
+internal` to let know flashrom that you will be flashing the chip internally.
+
+If you are interested in making any further modifications to your Libreboot
+image, it's best to read the official Libreboot and possibly Coreboot resources.
+If, for example, you want to change GRUB's background just as I did, you can
+read more about it here: <https://libreboot.org/docs/gnulinux/grub_cbfs.html>.
+
+[^1]: The Intel Management Engine is a secondary processor installed on all
+  Intel chips from circa 2007 onwards. It runs its own OS and environment and
+  has full control over the machine, furthermore it can't be officially disabled
+  by the user, and requires measures such as flashing custom firmware or even
+  soldering/desoldering certain components in order for it to be completely
+  neutered. It's a huge security risk, but unfortunately one can't be easily
+  mitigated and continues to be deployed like a virus in all modern x86
+  machines. Yes, AMD also has its own version of the ME called the PSP or
+  Platform Security Processor. Another reason why closed proprietary systems are
+  a bad thing for privacy, security and freedom.
+
+[^2]: <https://libreboot.org/>
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