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Jonas Jelonek 0c98150650 realtek: add support for Zyxel GS1920-24HPv2 
Add support for V2 of Zyxel GS1920-24HP with 24 copper ports, 4 combo
SFP/copper ports and PoE.

Specifications:
---------------

 * SoC: Realtek RTL8391M
 * Flash: 32MiB Flash
 * RAM: 256MiB
 * Ethernet: 24x 10/100/1000 Mbps
 * SFP: 4 combo copper/SFP ports (via RTL8214FC)
 * PoE: 24x
 * Fan controller: ADT7468
 * Serial: UART 3.3V TTL logic, 115200 8N1
     * pinout (front to back): GND RX TX VCC
 * Buttons: 1x Reset, 1x Restore

Notable differences to V1 (which require dedicated support):
 * "smaller" SoC (RTL8391M)
 * more RAM (256MiB vs 128MiB)
 * more Flash (32MiB vs 16MiB) + different layout
 * RTL8214FC uses different port numbers
 * SFP 25 and 26 use shared SCL
 * SFP 27 and 28 use different SDA
 * different monitoring IC (LM96000 vs ADT7468)
 * faster serial console by default
 * serial header easier accessible

Note that the port LEDs do not work correctly yet due to missing
LED configuration for RTL839X.

Installation:
-------------

(copied mostly as-is from 2a55846bf4)

This device uses ZyNOS instead of Linux, this makes installation a bit
more cumbersome. Serial console is required!

1. Set the switch to boot from the first image. This step is crucial,
   it will fail to boot if this is not set properly.

2. Connect to the switch using serial and interrupt the boot process
   to enter debug/recovery mode.

3. Load the OpenWrt initramfs image via XMODEM. You need to obtain an
   unlock code, based on your MAC address, first. See the excellent write
   up at https://www.ixo.de/info/zyxel_uclinux/ for details. Replace
   unlock_code in the commands below by the code obtained.
   The file length in bytes needs to be given instead of file_length below.
   You also need an XMODEM upload utility like "lrzsz-sx -X" to transfer
   the file. Start the XMODEM upload after running the ATUPxxxx command:

     > ATEN1,unlock_code
     > ATUP80100000,file_length
     > ATGO80100000

4. Wait for OpenWrt to boot. Once this is done, transfer the loader binary
   and the sysupgrade image to "/tmp" using scp.

5. Install OpenWrt permanently by running the following two commands on
   the switch (over SSH):

    > mtd write /tmp/loader.bin loader
    > mtd write /tmp/sysupgrade.bin firmware

6. Reboot the switch and enjoy OpenWrt.

NB: You do not need to touch the loader binary unless it's recommended.
    The loader is not part of a regular sysupgrade file and will be left
    untouched. The boot loader only checks if the loader is valid to be
    able to boot.

Recovery/ Return to stock:
--------------------------

Just spam the "u" key during (or "z" for 9600 baud) during memory testing
to trigger a recovery XMODEM upload at 115200 baud. A standard OEM upgrade
image works properly.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21944
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2026-02-13 23:33:25 +01:00
.devcontainer/ci-env devcontainer: Add development environment for gihub codespace 2023-10-30 23:34:26 +01:00
.github ci: rework and move build-on-comment action 2026-01-16 18:42:20 +07:00
.vscode meta: VS Code: add "Git: Always Sign Off" setting 2024-10-03 17:18:51 +02:00
config microchipsw: enable DCB by default 2026-01-25 22:10:22 +01:00
include treewide: drop CVS support 2026-02-13 15:40:13 +01:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package qualcommax: ipq807x: add Zyxel NWA110AX support 2026-02-13 21:35:49 +01:00
scripts scripts: update malta kernel path in qemustart 2026-02-11 00:08:34 +01:00
target realtek: add support for Zyxel GS1920-24HPv2 2026-02-13 23:33:25 +01:00
toolchain toolchain: glibc: Update glibc 2.41 to recent HEAD 2025-11-30 19:14:52 +01:00
tools tools: m4: update to 1.4.21 2026-02-13 16:56:37 +01:00
.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 build: use SPDX license tags 2021-02-05 14:54:47 +01:00
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