cross compiling for asuswrt-merlin / Asus AC68-U

[synfinatic]

I have some open source code (written in Go, linking to libpcap) that I'm building for a variety of hardware & operating systems. I have a user using asuswrt-merlin on a Asus AC68-U getting errors because when I build for Linux/ARMv7 I'm building on Ubuntu 20.04 which has a more modern glibc which requires a Linux kernel >= 3.2.0. So the user gets an error saying that the kernel is too old to run the binaries I build.

Was hoping there was a docker image or VM image or docs or something, anything which might explain how to end up with a tool chain which can cross compile for this platform? My ARM binaries work fine on more modern Linux systems (and FreeBSD) so I've already got this mostly working.... just not for a 2.6 kernel.

 

[dave14305]

GitHub - Adamm00/amcfwm: AsusWRT-Merlin - Custom Firmware Manager

AsusWRT-Merlin - Custom Firmware Manager. Contribute to Adamm00/amcfwm development by creating an account on GitHub.

github.com

This has been a popular script to setup a Merlin build environment.

Another example with a Debian Live CD (just to give you more ideas):

Entware - [SOLUTION] Cross-Compile PixelServ-TLS 2.4 Entware Package via Debian Live DVD

NOTE: After finally being convinced by the Entware & OpenWRT Developers that neither Build Environment was meant to be Compiled Natively on a Router (Neutered C Libraries), I decided to pursue this Cross-Compile PixelServ-TLS 2.4 Entware Package via Debian Live DVD solution; which, is presumably...

www.snbforums.com

 

[synfinatic]

Okay... so looks like the main shell script is cloning this git repo: https://github.com/RMerl/am-toolchains any chance anyone has a copy of the script(s) used to build these binaries? I need to make a small change...

 

[SomeWhereOverTheRainBow]

GitHub - Adamm00/amcfwm: AsusWRT-Merlin - Custom Firmware Manager

AsusWRT-Merlin - Custom Firmware Manager. Contribute to Adamm00/amcfwm development by creating an account on GitHub.

github.com

This has been a popular script to setup a Merlin build environment.

Another example with a Debian Live CD (just to give you more ideas):

Entware - [SOLUTION] Cross-Compile PixelServ-TLS 2.4 Entware Package via Debian Live DVD

NOTE: After finally being convinced by the Entware & OpenWRT Developers that neither Build Environment was meant to be Compiled Natively on a Router (Neutered C Libraries), I decided to pursue this Cross-Compile PixelServ-TLS 2.4 Entware Package via Debian Live DVD solution; which, is presumably...

www.snbforums.com

I'd say the script amcfwm works very well.

 

[trumpone]

Okay... so looks like the main shell script is cloning this git repo: https://github.com/RMerl/am-toolchains any chance anyone has a copy of the script(s) used to build these binaries? I need to make a small change...

The following post suggests that vendors don't compile their own toolchains: https://www.snbforums.com/threads/arm-toolchains-with-nptl-for-asuswrt-merlin.27938/

That said, I think you could look at either, Tomatoware (native compiler and statically linked libraries) or Entware (cross-compiler and dynamically linked libraries), for a modern Buildroot.