82c8c38a5c
With the default BUILD_BOT configuration on a linux 6.6 kernel, the WNDR4700's kernel no longer fits into the alloted ~3.5MiB, even with LZMA compression. Bigger kernels are possible, but there's a problem with Netgear's "bootcmd": > if loadn_dniimg 0 0x180000 0x4e0000 && chk_dniimg 0x4e0000; then nand read 0x800000 0x180000 0x20000;bootm 0x500000 - 0x800040;else fw_recovery; fi" This loads the dni-image starting offset 0x180000 from the NAND flash (which is the DTB partition) to 0x4e0000 in the RAM. It then checks whenever the provided image is "valid". If it is then it reads the DTB again to 0x800000 in the RAM and starts the extraction and boot process. (If the image wasn't valid then it starts the automated firmware recovery). The issues here are that first: the kernel image gets "squeezed" between 0x500040 and 0x7fffff... And second, the decompressor only has area 0x0 - 0x500000 for decompression. Hence the image now requires to update the bootcmd by providing new values (which have been successfully tested with the original Netgear WNDR4700 v1.0.0.56 firmware) for the RAM locations and make full use of the fact that loadn_dniimg loads the DTB as well. This needs to be done only once. Just connect a serial adapter to interface with uboot and overwrite (and save) the new bootcmd. WARNING: The serial port needs a TTL/RS-232 3.3v level converter! Steps: 0. Power-off the WNDR4700 1. Connect the serial interface (you need to open the WNDR4700) 2. Power-up the WNDR4700 3. Monitor the boot-sequence and hit "Enter"-key when it says: "Hit any key to stop autoboot" (Be quick, you have a ~2 second window) 4. in the Prompt enter the following commands (copy & paste) setenv bootcmd "if loadn_dniimg 0 0x180000 0xce0000 && chk_dniimg 0xce0000; then bootm 0xd00000 - 0xce0040;else fw_recovery; fi" saveenv run bootcmd Note: This new bootcmd will also unbrick devices that were bricked by the bigger 4.19-6.1 kernels. Note2: This method was tested with a WNDR4700. A big kernel with most debug features enabled on v6.6.22 measured 4.30 MiB when compressed with lzma. The uncompressed kernel is 12.34 MiB. This is over the 3 MiB, the device reserves for the kernel... But it booted! For bigger kernels, the device needs repartitioning of the the ubi partition due to the kernel+dtb not fitting into the partition. Note3: For initramfs development. I would advice to load the initramfs images to 0x800000 (or higher). i.e.: tftp 800000 wndr4700.bin Note4: the fw_recovery uboot command to transfer the factory image to the flash still works. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> |
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| target | ||
| toolchain | ||
| tools | ||
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| BSDmakefile | ||
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| feeds.conf.default | ||
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| README.md | ||
| rules.mk | ||
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
-
Run
./scripts/feeds update -ato obtain all the latest package definitions defined in feeds.conf / feeds.conf.default -
Run
./scripts/feeds install -ato install symlinks for all obtained packages into package/feeds/ -
Run
make menuconfigto select your preferred configuration for the toolchain, target system & firmware packages. -
Run
maketo 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
#openwrton oftc.net.
Developer Community
- Bug Reports: Report bugs in OpenWrt
- Dev Mailing List: Send patches
- Dev Chat: Channel
#openwrt-develon oftc.net.
License
OpenWrt is licensed under GPL-2.0