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Markus Stockhausen 21d3722c40 realtek: don't disable MIPS counter on secondary VPEs 
After observation that timer interrupt 7 always fires on secondary VPEs
the counter was disabled in the startup code. This is a bad idea when
building the kernel with jitterentropy. To generate entropy it makes use
of function random_get_entropy(). On MIPS architecture this simply reads
the counter register on the current core. With a disabled counter it
always returns the same value and the entropy initialization stalls the
core if it runs on a secondary VPE. See backtrace

[   21.736246] rcu: INFO: rcu_sched self-detected stall on CPU
[   21.736246] rcu: INFO: rcu_sched self-detected stall on CPU
[   21.748594] rcu:     1-....: (2100 ticks this GP) idle=064c/1/0x40000002 softirq=7/7 fqs=1050
[   21.748594] rcu:     1-....: (2100 ticks this GP) idle=064c/1/0x40000002 softirq=7/7 fqs=1050
[   21.766871] rcu:     (t=2102 jiffies g=-1187 q=25 ncpus=2)
[   21.766871] rcu:     (t=2102 jiffies g=-1187 q=25 ncpus=2)
[   21.778429] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.39 #482
[   21.778429] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.39 #482
[   21.778461] Hardware name: Zyxel GS1900-48
[   21.778461] Hardware name: Zyxel GS1900-48
...
[   21.779757] [<8029b968>] jent_measure_jitter+0xc8/0x10c
[   21.779757] [<8029b968>] jent_measure_jitter+0xc8/0x10c
[   21.779779] [<8029b9e8>] jent_gen_entropy+0x3c/0xb0
[   21.779779] [<8029b9e8>] jent_gen_entropy+0x3c/0xb0
[   21.779800] [<8029bcc0>] jent_entropy_collector_alloc+0x104/0x118
[   21.779800] [<8029bcc0>] jent_entropy_collector_alloc+0x104/0x118
[   21.779822] [<8029bd6c>] jent_entropy_init+0x4c/0x2ec
[   21.779822] [<8029bd6c>] jent_entropy_init+0x4c/0x2ec
[   21.779844] [<8086f184>] jent_mod_init+0x58/0xac
[   21.779844] [<8086f184>] jent_mod_init+0x58/0xac
[   21.779865] [<80100200>] do_one_initcall+0x70/0x250
[   21.779865] [<80100200>] do_one_initcall+0x70/0x250
[   21.779883] [<8085c018>] kernel_init_freeable+0x1f0/0x280
[   21.779883] [<8085c018>] kernel_init_freeable+0x1f0/0x280
[   21.779905] [<8067cba4>] kernel_init+0x20/0xb0
[   21.779905] [<8067cba4>] kernel_init+0x20/0xb0
[   21.779926] [<80101158>] ret_from_kernel_thread+0x14/0x1c
[   21.779926] [<80101158>] ret_from_kernel_thread+0x14/0x1c

This bit of entropy is helpful on these low end devices. Reenable the
counter and simply disable the interrupt.

Fixes: b7aab19585 ("realtek: SMP handling of R4K timer interrupts")
Reported-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/19499
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 		2025-07-26 15:51:23 +02:00
.devcontainer/ci-env devcontainer: Add development environment for gihub codespace 2023-10-30 23:34:26 +01:00
.github ci: add missing permission to add comments 2025-06-24 16:29:05 +02:00
.vscode meta: VS Code: add "Git: Always Sign Off" setting 2024-10-03 17:18:51 +02:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
config image: add support for EROFS rootfs image generation 2025-07-05 15:24:54 +02:00
include prereq: prefer existing built coreutils as symlink target 2025-07-26 14:38:08 +02:00
package gettext-full: update to 0.24.1 2025-07-26 14:38:09 +02:00
scripts download: add support for gitweb snapshots 2025-07-26 14:38:08 +02:00
target realtek: don't disable MIPS counter on secondary VPEs 2025-07-26 15:51:23 +02:00
toolchain toolchain/gcc: prevent the use of LDRD/STRD on ARMv5TE 2025-07-22 12:03:05 +02:00
tools tools/automake: update to 1.18 2025-07-26 14:38:09 +02:00
.gitattributes .gitattributes: ignore some whitespace "violations" in .patch files 2024-12-12 11:01:56 +01:00
.gitignore gitignore: ignore local APK keys 2024-05-17 22:03:06 +03:00
BSDmakefile build: use SPDX license tags 2021-02-05 14:54:47 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
Config.in build: scripts/config - update to kconfig-v5.14 2022-02-19 13:10:01 +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
feeds.conf.default feeds.conf.default: enable video feed by default 2024-12-05 01:34:01 +00:00
rules.mk rules.mk: respect the empty CONFIG_HOST_FLAGS_OPT 2025-05-16 20:42:43 +02:00

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