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67 lines
2.6 KiB
Markdown
67 lines
2.6 KiB
Markdown
# Toshiba Chromebook 2 `swanky`
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There might be a way to install NixOS without hardware modifications (via
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enabled developer mode and SeaBIOS boot on Ctrl+L), however I'd highly
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recommend replacing Google's Coreboot payload with Tianocore: that allows for
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proper virtualization, suspend, removes annoying developer mode screen, and
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generally just works much better.
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These instructions carry some risk of bricking your device, since you'll be
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reflashing BIOS. Risk is rather low, but please for the love of god make a BIOS
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backup and store it someplace safe. That's the only way to reinstall ChromeOS
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back after this procedure (BIOS image has licensing info), and it's much easier
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to use a known good state to unbrick the laptop if things go wrong.
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If you ever get unlucky, you can unbrick your device using Raspberry Pi,
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some cables and a SOIC clip, see:
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http://sicarul.com/how-to-un-brick-your-toshiba-chromebook-2-gandof-without-invoking-any-demons/
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## Enable developer mode
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This will wipe all user data and settings from the laptop.
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Power off, then hold ESC + Refresh (F3) and abruptly press power button. You
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should see "Chrome OS is missing or damaged" message. Press Ctrl+D. Press enter
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at the next screen, then press Ctrl+D again. Wait until the laptop boots into
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ChromeOS, then power it off.
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## Disable hardware-backed BIOS write protection
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Follow the first part of the guide at:
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https://github.com/brendenyule/NativeToshibaCB2Guide/wiki/Remove-Write-Protect
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Ignore SeaBIOS section. I also used some ductape over #5 to make sure that
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metallic motherboard shield would not re-enable write protection.
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## Flash Coreboot + Tianocore BIOS
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Prepare a FAT32-formatted flash drive for BIOS backup in advance.
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Go through ChromeOS installation dialogues until you have network access and
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are able to log into a guest session. Open Chrome, press Ctrl+Alt+T to open
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`crosh`, type in `shell` to get a real shell. Then, run:
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```
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$ cd ~
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$ curl -LO https://mrchromebox.tech/firmware-util.sh
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$ sudo bash firmware-util.sh
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```
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Choose "Install/Update Full ROM Firmware" option and follow instructions.
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Do not skip BIOS backup!
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Documentation: https://mrchromebox.tech/#fwscript
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## Enable hardware-backed BIOS write protection
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This is a cool security feature, so after flashing Coreboot + Tianocore BIOS
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and making sure new BIOS works, consider re-enabling BIOS protection. Just put
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in the missing screw #5.
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## Install NixOS
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`dd` an image on a flash drive, partition the drive, etc. On some later models,
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you can swap SSD with any other 2242 M.2 SATA SSD, but on `swanky`, you have
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to live with what you have (16GB eMMC). I recommend `256MB` for EFI partition,
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and the rest for `/`.
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