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284668f151
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David Yang 284668f151 econet: en751221: add support for Huawei HG2821T-U 
This patch adds support for Huawei HG2821T-U, EPON ONU and home router,
often comes with ISP service.

Specifications
==============
* SoC: Econet EN7526GT
* RAM: 512MiB DDR3L (MT41K256M16TW-107)
* Flash: 256MiB SPI NAND (TC58CVG1S3HRAIG)
* WiFi 2.4GHz: MT7592N
* WiFi 5GHz: MT7612EN
* Ethernet: builtin switch
* LED: Power, Internet, WiFi, USB
* Buttons: Reset
* UART: Serial console (115200 8n1)
* USB: 1 x USB2
* Other: Phone jack, XPON fiber port

!!! BACKUP YOUR ROM !!!
=======================
Please always have your FULL flash image backup before flashing
anything. The vendor firmware varies a lot depending on your ISP and
location. You will have a hard time finding the right regional firmware
if you don't have a backup.

Notes
=====
* Due to the target `econet` being incomplete, WiFi, DSA switch, and
many other features are not supported yet. Do not flash the image unless
you know the consquences or `econet` is declared stable.
* This device, and apparently many other devices of this platform, use
a dual-image layout. OpenWRT (with `econet` target) only uses slot A.
Slot B is not used by OpenWRT, and is applicable for dual-booting to
vendor firmware.
* If you do not use vendor firmware anymore, you can erase and reuse
anything after `configuration_b`, which gives you ~110 MiB free space.
Again, backup your flash first.

Installation
============
Within shell
------------
Note that acquiring the shell access to the vendor firmware can be a bit
tricky depending on the firmware variation. If you can't play with the
vendor firmware, boot to OpenWrt using debricking method below.

0. (Optional) Back up your flash, and / or move the vendor firmware to
   slot B
1. Build and then locate the `kernel.bin` and `rootfs.bin` image files
2. Upload `kernel.bin` and `rootfs.bin` to the device (via HTTP or USB
   stick), then type:
   ```
   mtd write -f -e KernelA kernel.bin KernelA
   mtd erase RootfsA
   mtd write -f -r -e AppA rootfs.bin AppA
   ```

From bootloader
---------------
1. Build and then locate the `kernel.bin` and `rootfs.bin` image files
2. Switch device on and press a key within 3 seconds
3. Upload `kernel.bin` via TFTP as described below
4. Once the transfer has completed successfully, bootloader will give
   you the file length in "Total %d (0x%X) bytes received", then type
   `flash 200000 80020000 <file length hex>`
5. Upload `rootfs.bin` then flash with
   `flash 600000 80020000 <file length hex>`
6. Restart the device to boot into OpenWRT

> [!IMPORTANT]
> Do not try `httpd` in the bootloader. It writes to the wrong address
  and will corrupt the flash.

Debricking
==========
1. Build and then locate the `initramfs-kernel.bin` image files
2. Switch device on and press a key within 3 seconds
3. Connect to device via ethernet, set the IP address to `192.168.1.X`,
   then upload the image via TFTP
   `tftp 192.168.1.1 -m binary -v -c put initramfs-kernel.bin`

   The file name can be anything except `tcboot.bin` or `tclinux.bin`,
   they will corrupt the flash.
4. Type `jump 80020000` to boot the kernel from memory

Dual boot
=========
Use `en75_chboot` tool to switch between vendor firmware and OpenWrt. If
you are soft-locked, you can also switch the flag in the bootloader:
1. Switch device on and press a key within 3 seconds
2. Select the kernel that you wish to use:
   - `memwl 80020000 30ffffff` for `KernelA` (OpenWrt)
   - `memwl 80020000 31ffffff` for `KernelB` (Factory)
3. Select the rootfs, which should be the same as the kernel:
   - `memwl 80020004 30ffffff` for `RootfsA` (OpenWrt)
   - `memwl 80020004 31ffffff` for `RootfsB` (Factory)
3. Commit the data to flash: `flash 1e0000 80020000 8`
4. Restart the device to boot into the selected OS

MAC addresses
=============
`//configuration_a/factory.conf` contains MAC addresses, along with
other pre-configured settings. OpenWrt uses `brmac`, `internetmac`,
`APMAC`, and `APMAC_5G`, while `tr069mac`, `voipmac`, `priprotocolmac`,
and `PONMac` are not used for now.

Signed-off-by: David Yang <mmyangfl@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23131
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2026-05-14 20:52:09 +02:00
.devcontainer/ci-env devcontainer: Add development environment for gihub codespace 2023-10-30 23:34:26 +01:00
.github github: separate concurrency group per event for kernel and packages 2026-05-11 15:36:58 +02:00
.vscode meta: VS Code: add "Git: Always Sign Off" setting 2024-10-03 17:18:51 +02:00
config treewide: remove unused archs leftovers 2026-05-07 10:58:47 +02:00
include kernel: fix lz4 initramfs creation 2026-05-07 18:14:58 +02:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package ntfs: update to 2026-05-03 2026-05-14 19:05:45 +02:00
scripts scripts: add git_commit to profiles.json 2026-04-21 19:47:58 +08:00
target econet: en751221: add support for Huawei HG2821T-U 2026-05-14 20:52:09 +02:00
toolchain toolchain: musl: backport patches with CVE fixes 2026-05-13 01:59:29 +02:00
tools firmware-utils: update to Git HEAD (2026-05-04) 2026-05-05 14:10:39 +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 build: do not set CCACHE_COMPILERCHECK 2026-04-22 23:57:01 +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