05be273a35
* boards: enable CONFIG_FS_LARGEFILE for NuttX boards with MMC/SD
Without large file support, fsblkcnt_t/off_t are 32-bit and statfs
consumers (procfs /fs/usage, df) compute the volume size as
f_bsize * f_blocks in 32 bits, which wraps at 4GB. Boards with an
SD card or eMMC larger than 4GB report the wrong capacity, e.g. a
32GB SD card on FMU-V6X:
nsh> ls -l /dev/mmcsd0
brw-rw-rw-1850212352 /dev/mmcsd0 (= 31914983424 mod 2^32)
nsh> df -h
vfat 1749M 240K 1749M /fs/microsd
With CONFIG_FS_LARGEFILE=y the same card reports the full 29G.
This enables the option on the 77 boards that build the MMC/SD block
driver (CONFIG_MMCSD=y, SDIO or SPI). Boards without removable storage
and constrained-flash targets (CONFIG_BOARD_CONSTRAINED_FLASH=y) are
left unchanged.
Note: on the px4_firmware_nuttx-10.3.0+ branch the 64-bit file types
are additionally gated on CONFIG_HAVE_LONG_LONG, which is only defined
via nuttx/compiler.h include order, making the option unreliable. That
gating is fixed by the companion NuttX backport PR
(PX4/NuttX, branch backport-fs-largefile, upstream commit 92b2f1bd3d3).
Tested on a custom STM32H743 board with 8GB eMMC and on FMU-V6X with a
32GB SD card.
* fix(boards): enable CONFIG_FS_LARGEFILE for MMC/SD variant configs
The test/console/stackcheck/socketcan/sysview/cyphal/debug/cryptotest
variant configs of boards covered by the previous commit were missed,
leaving them with 32-bit off_t. fmu-v5 protected is intentionally
excluded: protected-mode syscall proxies keep 32-bit widths.
Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com>
* chore(nuttx): bump submodule for FS_LARGEFILE backport
Picks up the backport of upstream NuttX 92b2f1bd3d3, which gates the
64-bit file types on CONFIG_FS_LARGEFILE alone instead of the
include-order-dependent CONFIG_HAVE_LONG_LONG.
Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com>
---------
Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com>
Co-authored-by: Jacob Dahl <dahl.jakejacob@gmail.com>
The autopilot stack the industry builds on.
About
PX4 is an open-source autopilot stack for drones and unmanned vehicles. It supports multirotors, fixed-wing, VTOL, rovers, and many more experimental platforms from racing quads to industrial survey aircraft. It runs on NuttX, Linux, and macOS. Licensed under BSD 3-Clause.
Why PX4
Modular architecture. PX4 is built around uORB, a DDS-compatible publish/subscribe middleware. Modules are fully parallelized and thread safe. You can build custom configurations and trim what you don't need.
Wide hardware support. PX4 runs on a wide range of autopilot boards and supports an extensive set of sensors, telemetry radios, and actuators through the Pixhawk ecosystem.
Developer friendly. First-class support for MAVLink and DDS / ROS 2 integration. Comprehensive SITL simulation, hardware-in-the-loop testing, and log analysis tools. An active developer community on Discord and the weekly dev call.
Vendor neutral governance. PX4 is hosted under the Dronecode Foundation, part of the Linux Foundation. Business-friendly BSD-3 license. No single vendor controls the roadmap.
Supported Vehicles
 Multicopter |
 Fixed Wing |
 VTOL |
 Rover |
…and many more: helicopters, autogyros, airships, submarines, boats, and other experimental platforms. These frames have basic support but are not part of the regular flight-test program. See the full airframe reference.
Try PX4
Run PX4 in simulation with a single command. No build tools, no dependencies beyond Docker:
docker run --rm -it -p 14550:14550/udp px4io/px4-sitl:latest
Open QGroundControl and fly. See PX4 Simulation Quickstart for more options.
Build from Source
git clone https://github.com/PX4/PX4-Autopilot.git --recursive
cd PX4-Autopilot
make px4_sitl
Note
See the Development Guide for toolchain setup and build options.
Documentation & Resources
| Resource | Description |
|---|---|
| User Guide | Build, configure, and fly with PX4 |
| Developer Guide | Modify the flight stack, add peripherals, port to new hardware |
| Airframe Reference | Full list of supported frames |
| Autopilot Hardware | Compatible flight controllers |
| Release Notes | What's new in each release |
| Contribution Guide | How to contribute to PX4 |
Community
- Weekly Dev Call — open to all developers (Dronecode calendar)
- Discord — Join the Dronecode server
- Discussion Forum — PX4 Discuss
- Maintainers — see
MAINTAINERS.md - Contributor Stats — LFX Insights
Contributing
We welcome contributions of all kinds — bug reports, documentation, new features, and code reviews. Please read the Contribution Guide to get started.
Citation
If you use PX4 in academic work, please cite it. BibTeX:
@software{px4_autopilot,
author = {Meier, Lorenz and {The PX4 Contributors}},
title = {{PX4 Autopilot}},
publisher = {Zenodo},
doi = {10.5281/zenodo.595432},
url = {https://px4.io}
}
The DOI above is a Zenodo concept DOI that always resolves to the latest release. For a version-pinned citation, see the Zenodo record or our CITATION.cff.
Governance
The PX4 Autopilot project is hosted by the Dronecode Foundation, a Linux Foundation Collaborative Project. Dronecode holds all PX4 trademarks and serves as the project's legal guardian, ensuring vendor-neutral stewardship — no single company owns the name or controls the roadmap. The source code is licensed under the BSD 3-Clause license, so you are free to use, modify, and distribute it in your own projects.
