Setup OpenWrt sdk to use a bin

For Developers
1

Hello all,

WARNING: I am a newbie.

  1. I want to run a C program in a openwrt router (ZBT826-T2).

The manufacturer sent me the firmware file (mt7620-WE826-T2.bin).

How do I use this file to setup my SDK so I can cross-compile and build a new firmware that includes my C program?

  1. Also what options should I put in "make menuconfig"?

I checked this (https://openwrt.org/toh/hwdata/zbt/zbt_we826_32m) but can't find in make menuconfig the options mentioned in this webpage!

Thank you for your help.

2
  1. You can't. You need the source code, not an already-compiled BIN file.
3

Thanks for your reply...

Is there a way to easily find the menuconfig options of a specific img?

I mean, I installed OpenWrt in Virtualbox for testing and I will use it as my primary target for development. But I installed a pre-compiled img (openwrt-x86-generic-combined-ext4.img).

If I wanted to recompile it to include my helloworld C program, what would be the options in the make menuconfig be?

Thanks again.

4

It is perhaps easiest to define a package for your executable and how it should be installed on the device.

https://openwrt.org/docs/guide-developer/helloworld/start

is one place to start to understand the process.

5

That is exactly the tutorial I am following. But I think the options of the menuconfig should be adapted to the target.

When I try to install my package in the virtualbox with openwrt it fails saying it was not built for that system.

That is why I ask what should be the options of menuconfig to compile/build for that target.

B

6

You're not building anything. You're installing a pre-built, closed-source binary executable.

7

But my question is still valid. Can you help me to know the menuconfig options?

8

You have to download sdk from ramips target as your device based on openwrt toh is ramips. Run make menuconfig. Target is mediatek mips. Sub target mt7620. Model we826

9

Many thanks. Will do.

And for the img I am running on virtualbox? What are the correct settings?
openwrt-x86-generic-combined-ext4.img

10

Found the options for the image that I am running in virtualbox:

Target System -> user mode linux
Target profile -> Default
Target Images -> included ext4

for the helloworld I included it also in the Examples as per the tutorial

Thank you all. :slight_smile: