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126 lines
6.0 KiB
126 lines
6.0 KiB
# Trezor One Bootloader and Firmware
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## Building with Docker
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Ensure that you have Docker installed. You can follow [Docker's installation instructions](https://docs.docker.com/engine/installation/).
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Clone this repository, then use `build-docker.sh` to build all images:
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```sh
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git clone https://github.com/trezor/trezor-firmware.git
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cd trezor-firmware
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./build-docker.sh
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```
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When the build is done, you will find the current firmware in `build/legacy/firmware/trezor.bin`.
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### Running with sudo
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It is possible to run `build-docker.sh` if either your Docker is configured in rootless mode,
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or if your user is a member of the `docker` group; see [Docker documentation](https://docs.docker.com/install/linux/linux-postinstall/)
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for details.
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If you don't satisfy the above conditions, and run `sudo ./build-docker.sh`, you might receive a `Permission denied`
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error. To work around it, make sure that the directory hierarchy in `build/` directory
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is world-writable - e.g., by running `chmod -R a+w build/`.
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## Building older versions
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For firmware versions **1.8.1** and newer, you can checkout the respective tag locally.
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To build firmware 1.8.2, for example, run `git checkout legacy/v1.8.2` and then use
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the instructions below.
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Note that the unified Docker build was added after version 1.8.3, so it is not available
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for older versions.
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For firmwares older than 1.8.1, please clone the archived [trezor-mcu](https://github.com/trezor/trezor-mcu) repository and follow the instructions in its README.
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## Local development build
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Make sure you have Python 3.6 or later and [Poetry](https://python-poetry.org/)
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installed.
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If you want to build device firmware, also make sure that you have the [GNU ARM Embedded toolchain](https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads) installed.
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See [Dockerfile](../../ci/Dockerfile#L72-L76) for up-to-date version of the toolchain.
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The build process is configured via environment variables:
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* `EMULATOR=1` specifies that an emulator should be built, instead of the device firmware.
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* `DEBUG_LINK=1` specifies that DebugLink should be available in the built image.
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* `MEMORY_PROTECT=0` disables memory protection. This is necessary for installing unofficial firmware.
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* `DEBUG_LOG=1` enables debug messages to be printed on device screen.
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* `BITCOIN_ONLY=1` specifies Bitcoin-only version of the firmware.
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To run the build process, execute the following commands:
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```sh
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# enter the legacy subdirectory
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cd legacy
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# set up poetry
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poetry install
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# set up environment variables. For example, to build emulator with debuglink:
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export EMULATOR=1 DEBUG_LINK=1
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# clear build artifacts
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poetry run ./script/setup
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# run build process
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poetry run ./script/cibuild
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```
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A built device firmware will be located in `legacy/firmware/trezor.bin`. A built emulator will be
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located in `legacy/firmware/trezor.elf`.
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### Common errors
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* **"Exception: bootloader has to be smaller than 32736 bytes"**: if you didn't modify the bootloader
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source code, simply make sure you always run `./script/setup` before runnning `./script/cibuild`
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* **"error adding symbols: File in wrong format"**: This happens when building emulator after building
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the firmware, or vice-versa. Execute the following command to fix the problem:
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```sh
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find -L vendor -name "*.o" -delete
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```
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You can launch the emulator using `./firmware/trezor.elf`. To use `trezorctl` with the emulator, use
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`trezorctl -p udp` (for example, `trezorctl -p udp get_features`).
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You can use `TREZOR_OLED_SCALE` environment variable to make emulator screen bigger.
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## How to get fingerprint of firmware signed and distributed by SatoshiLabs?
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1. Pick version of firmware binary listed on https://wallet.trezor.io/data/firmware/1/releases.json
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2. Download it: `wget -O trezor.signed.bin https://wallet.trezor.io/data/firmware/1/trezor-1.6.1.bin`
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3. Use `trezorctl` dry-run mode to get the firmware fingerprint:
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```sh
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trezorctl firmware-update -n -f trezor.signed.bin
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```
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Step 3 should produce the same fingerprint like your local build (for the same version tag).
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## How to install custom built firmware?
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**WARNING: This will erase the recovery seed stored on the device! You should never do this on Trezor that contains coins!**
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Build with `MEMORY_PROTECT=0` or you will get a hard fault on your device.
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Switch your device to bootloader mode, then execute:
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```sh
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trezorctl firmware-update -f build/legacy/firmware/trezor.bin
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```
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## Combining bootloader and firmware with various `MEMORY_PROTECT` settings, signed/unsigned
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Not all combinations of bootloader and firmware will work. This depends on
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3 variables: MEMORY_PROTECT of bootloader, MEMORY_PROTECT of firmware, whether firmware is signed
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This table shows the result for bootloader 1.8.0+ and 1.9.1+:
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| Bootloader MEMORY_PROTECT | Firmware MEMORY_PROTECT | Is firmware officially signed? | Result |
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| ------------------------- | ----------------------- | ------------------------------ | ------------------------------------------------------------------------------------------ |
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| 1 | 1 | yes | works, official configuration |
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| 1 | 1 | no | hardfault in header.S when setting VTOR and stack |
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| 0 | 1 | no | works, but don't forget to comment out `check_bootloader`, otherwise it'll get overwritten |
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| 0 | 0 | no | hard fault because header.S doesn't set VTOR and stack right |
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| 1 | 0 | no | works |
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The other three possibilities with signed firmware and `MEMORY_PROTECT!=0` for bootloader/firmware don't exist.
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