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Hauke Mehrtens 04f10eb796 build: set max-page-size linker flag to match target page size 
ELF binaries embed the maximum page size used during linking in the
PT_LOAD segment alignment. If this value is larger than the actual
system page size, the kernel will still load the binary but wastes
memory due to over-alignment. If it is smaller, the binary may fail
to load or cause incorrect behavior with features like RELRO.

Most architectures use 4KB pages, but loongarch64 uses 16KB pages
(CONFIG_PAGE_SIZE_16KB). Explicitly pass -z max-page-size to the
linker so that binaries are built with the correct page alignment for
the target, avoiding issues with RELRO segment padding and ensuring
correct memory mapping on the target system.

Before binutils 2.39 RELRO sections were padded to common page size
which is 4K on MIPS, with binutils 3.29 the padding was changed to
max page size which is 64K on MIPS. With this change we will pad them to
4K again.

This reduces the size of user space binaries in OpenWrt.
The size of the uncompressed root file system of a mips malta be build
decreased by about 20%.

old file size:
```
$ du -s build_dir/target-mips_24kc_musl/root-malta/
15844	build_dir/target-mips_24kc_musl/root-malta/
```

New file size:
```
$ du -s build_dir/target-mips_24kc_musl/root-malta/
12564	build_dir/target-mips_24kc_musl/root-malta/
```

The size of the image did not decrease much because of the strong
compression used by OpenWrt.

Link: https://github.com/openwrt/openwrt/pull/22800
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2026-04-08 00:34:59 +02:00
.devcontainer/ci-env devcontainer: Add development environment for gihub codespace 2023-10-30 23:34:26 +01:00
.github github: switch claude-code-action to hauke/claude-code-action v1.0.77-fixed 2026-03-24 01:23:10 +01:00
.vscode meta: VS Code: add "Git: Always Sign Off" setting 2024-10-03 17:18:51 +02:00
config x86: make CONFIG_NR_CPUS a tunable (2-512) 2026-03-28 11:51:11 +01:00
include build: set max-page-size linker flag to match target page size 2026-04-08 00:34:59 +02:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package uboot-mediatek: bpi-r4-lite fix emmc frequency 2026-04-08 00:17:56 +02:00
scripts build: reject non-matching artifacts 2026-03-12 09:31:25 +01:00
target ramips: refresh patches 2026-04-08 00:01:20 +02:00
toolchain toolchain: binutils: fix update to 2.45.1 2026-03-01 02:06:00 +01:00
tools tools/cmake: update to 4.3.1 2026-04-07 23:01:22 +02:00
.gitattributes gitattributes: automatically convert dts file CRLF line endings to LF 2025-11-29 17:52:35 +01:00
.gitignore gitignore: ignore local APK keys 2024-05-17 22:03:06 +03:00
BSDmakefile
Config.in build: scripts/config - update to kconfig-v5.14 2022-02-19 13:10:01 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
feeds.conf.default feeds: revert to git.openwrt.org 2026-01-09 21:55:00 +01:00
Makefile build: include tests/Makefile if available 2024-06-17 17:51:31 +02:00
README.md README: replace "MacOSX" with "macOS" 2024-04-01 18:46:30 +02:00
rules.mk rules.mk: add DEPRECATION NOTICE for AUTORELEASE 2025-10-29 21:09:57 +01:00

README.md

OpenWrt logo

OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

Sunshine!

Download

Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.

If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.

An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:

Development

To build your own firmware you need a GNU/Linux, BSD or macOS system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.7+ rsync subversion unzip which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

Related Repositories

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

  • LuCI Web Interface: Modern and modular interface to control the device via a web browser.

  • OpenWrt Packages: Community repository of ported packages.

  • OpenWrt Routing: Packages specifically focused on (mesh) routing.

  • OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

Support Community

  • Forum: For usage, projects, discussions and hardware advise.
  • Support Chat: Channel #openwrt on oftc.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0