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For help, you can open a github issue in the appropriate repo, or join the Matrix chat.
- Update your device using the Precursor Updater. Out-of-box Precursors have an ancient version of Xous.
- For those with a limited edition Precursor: How to Assemble a Limited Edition (Video)
- Inspect your mainboard
- Set up passwords on "factory new" devices, by selecting the item from the main menu, or following the prompts at boot
- (Optional) Burn Battery-Backed RAM keys, aka your "backup key".
- (Optional) Backup your data. Recommended if you use BBRAM keys, since they are volatile.
- Factory reset - if you forget your login password or want to dispose of or resell your device
- Out of the box, the basic firmware image for Precursor comes with
shellchat
andvault
apps. - Apps are statically loaded programs, linked into the firmware image.
- To add additional apps, build a custom firmware image and load it onto your Precursor.
Currently Available Apps include:
- Shellchat - the default app when you power on.
- Vault - a physical password vault. Make, store, and autotype passwords; generate TOTP codes; and perform FIDO2/U2F authentication. Perhaps the only hardware FIDO token with secure backups.
- Matrix client - a simple Matrix chat application.
- Mtxchat - next-gen matrix client, currently WIP.
- Transientdisk - present a 1.44MiB RAM drive to a host over USB. Contents are cleared when the app is closed, or the device is put to sleep. Useful for transferring secret keys over short distances.
- Backups - the thing you think you'll never need. Until you do. Highly recommended.
- Run
cargo xtask run
, and it will pop up a "host-mode" emulated version of Precursor. - To add additional apps other than the default, add them after
run
, likecargo xtask run hello ball
(will build and add both thehello
andball
apps)- check
cargo xtask --help
for the full list of commands and options. - Hosted emulator uses
Home
(Fn+⬅
on Mac) for the center key on the Precursor device, use this button when navigating within the emulator.
- check
- If you get a build error, try updating to the latest rust with
rustup update
- If you have updated
rust
or have tinkered withstd
on your system, you can re-install thexous
target withcargo xtask install-toolkit --force
, and then runrm -r target
to force remove stale build files. - You may also need to install some additional libraries, such as
libxkbdcommon-dev
. - Xous has generally been tracking the latest stable Rust toolchain, so if your build isn't working, try updating to the latest stable Rust, or if there was just a release, try one version before the latest version. Alternatively, you can check the CI logs for the version used in the last stable build, by searching for
rustc --version
in the log.- To set the toolchain version, run
rustup override set 1.64
(or which ever version you're trying to target). - Arch Linux users: Hoverbear has written a guide for setting up Xous on Arch Linux!
- To set the toolchain version, run
-
repl
app demo is the starting point for users who want to interact with their device by typing commands. This demo leverages more of the Xous UX built-in frameworks. -
ball
app demo is the starting point for users who prefer to run close to the bare iron, getting only key events and a framebuffer for crafting games and bespoke apps.
- Please refer to the manifest.json documentation for integration notes.
⚠️ hosted mode is literally Xous running on your local host, which means it supports more features than Xous on native hardware:- We do not have
tokio
support planned anytime soon. - We do not have
File
support in Xous; instead, we have thepddb
. -
Net
support in actively in development and we hope to have fairly robust support forlibstd
Net
but, note thatsocket2
crate (which is not part of Rustlibstd
) does not recognize Xous as a supported host.
- We do not have
- It is recommended to try compiling your configuration for a real hardware target or Renode early on to confirm compatibility, before doing extensive development in hosted mode.
- Currently, the only hardware implementation of the project referenced in this repo is the Precursor device. If you port Xous to a new platform, please reference the target right here in this wiki!
- For how to implement localized strings, please see the locales readme.
- Xous Book Xous API docs, structure, etc.
- Jargon: Confused by terms like SoC and EC? You're not alone.
- Tips and tricks stuck on a bug? Look here.
- Build the SoC from Scratch
Organized, roughly, from top of the stack and drilling into the hardware.
- App manifest and adding apps
-
GDB is available with a custom-built kernel using the argument
--gdb-stub
. GDB is mainly tested for the Renode target; it should work for "real" hardware as well but it is not as well tested.
-
Xous API documentation and examples
- Messaging Idoms is the starting point for common idioms on talking to Xous services.
- Modals API is the starting point for interactive UX elements.
- Xous Book is gradually coming together
- Services describes the various servers that compose the services provided by the Xous microkernel.
- Push Events
- Graphical Abstraction Manager (GAM) architecture; applications guide
- xous-names Name resolution for server IDs
- Localization
- PDDB Plausibly Deniable DataBase for deniable data storage of secrets. Also see this blog post for an overview.
-
PDDB path conventions for
libstd
integration. - Boot flow specification
- Quickstart is on the main page
- Memory layout
- FLASH layout
- Processes
- Syscalls
- Startup Sequence
- Boot arguments
- Loader Stage 1 loader for the kernel
- Suspend/resume
- What happens before boot? fills in the details of everything that happens before the first instruction gets run.
- "Secure Boot" and key ROM layout
- eFuse/BBRAM FPGA key FAQ
- UTRA Hardware register access abstraction for Xous
- Peripheral access conventions Goals for hardware register abstractions
- COM Protocol between the embedded controller (EC) and the main SoC
- SoC register set / generated from SoC Litex Design Source
- SoC block diagram is embedded in the README for the SoC
- EC register set / generated from EC Litex Design Source
- Hardware design files PDFs of schematics are in the "mainboard-*" directories
- Physics and electrical design of the external Avalanche generator
- Notes on Characterization and debugging of raw sources
- On-line health monitoring
- Post-Generation Conditioning with ChaCha
-
crate-scraper is the beginning of a tool that helps with audit trails. It saves all the source code derived from
crates.io
to build Xous, and collates all thebuild.rs
files into a single mega-file for faster manual inspection.
- imports How imported repositories that are not yet stand-alone crates are managed
- Emulation
- Tools Helper tools to build bootable images
- Converting Wiki Pages from ODT to Markdown
- Release checklist
- Updating Crates order of crates to update to crates.io when making changes
- RISC-V International Seattle RISC-V Group Betrusted Progress Call
- 36c3 Introducing the core principles that motivate the hardware architecture
- LCA20 Evolution and planning of the overall project, including software layers
- FOSSNORTH20 Precursor overview talk
- Precursor SoC Tour
- Precursor Mainboard tour
- Other Precursor posts hardware security evaluation, braille keyboard, hackability, mechanical and PCB design aspects.
- Precursor + Renode, Multi-device emulation
- Boot to root in one hour
- Spartan 7 JTAG notes on the eFuse structure (for self-provisioning of security keys)
- HCI target rationale.
- Hardware systems architecture analysis for details on the analysis that lead us to our current architectural constraints.
- Betrusted development plan a now largely historical document that outlined schedule and overall development plan.
This project is funded in part through the NGI0 PET Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 825310.