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README.md

TREZOR One Bootloader and Firmware

Build Status gitter

https://trezor.io/

How to build the TREZOR bootloader and firmware?

  1. Install Docker
  2. git clone https://github.com/trezor/trezor-mcu.git
  3. cd trezor-mcu
  4. ./build.sh BOOTLOADER_TAG FIRMWARE_TAG (where BOOTLOADER_TAG is bl1.5.0 and FIRMWARE_TAG is v1.7.0 for example, if left blank the script builds latest commit in master branch)

This creates the files build/bootloader-BOOTLOADER_TAG.bin and build/trezor-FIRMWARE_TAG.bin and prints their fingerprints and sizes at the end of the build log.

How to build TREZOR emulator for Linux?

  1. Install Docker
  2. git clone https://github.com/trezor/trezor-mcu.git
  3. cd trezor-mcu
  4. ./build-emulator.sh TAG (where TAG is v1.5.0 for example, if left blank the script builds latest commit in master branch)

This creates binary file build/trezor-emulator-TAG, which can be run and works as a trezor emulator. (Use TREZOR_OLED_SCALE env. variable to make screen bigger.)

How to get fingerprint of firmware signed and distributed by SatoshiLabs?

  1. Pick version of firmware binary listed on https://wallet.trezor.io/data/firmware/1/releases.json
  2. Download it: wget -O trezor.signed.bin https://wallet.trezor.io/data/firmware/1/trezor-1.6.1.bin
  3. Compute fingerprint: tail -c +257 trezor.signed.bin | sha256sum

Step 3 should produce the same sha256 fingerprint like your local build (for the same version tag). Firmware has a special header (of length 256 bytes) holding signatures themselves, which must be avoided while calculating the fingerprint, that's why tail command has to be used.

How to install custom built firmware?

WARNING: This will erase the recovery seed stored on the device! You should never do this on TREZOR that contains coins!

  1. Install python-trezor: pip install trezor (more info)
  2. trezorctl firmware_update -f build/trezor-TAG.bin

Building for development

If you want to build device firmware, make sure you have the GNU ARM Embedded toolchain installed.

  • If you want to build the emulator instead of the firmware, run export EMULATOR=1 TREZOR_TRANSPORT_V1=1
  • If you want to build with the debug link, run export DEBUG_LINK=1. Use this if you want to run the device tests.
  • When you change these variables, use script/setup to clean the repository
  1. To initialize the repository, run script/setup
  2. To build the firmware or emulator, run script/cibuild

If you are building device firmware, the firmware will be in firmware/trezor.bin.

You can launch the emulator using firmware/trezor.elf. To use trezorctl with the emulator, use trezorctl -t udp (for example, trezorctl -t udp get_features).

If trezorctl -t udp appears to hang, make sure you have run export TREZOR_TRANSPORT_V1=1.