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https://github.com/embox/embox

Modular and configurable OS for embedded applications
https://github.com/embox/embox

c embedded kernel mcu microcontroller os posix

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Modular and configurable OS for embedded applications

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README 

        
Embox [![Coverity Scan Build Status](https://scan.coverity.com/projects/700/badge.svg)](https://scan.coverity.com/projects/700)

=====



Embox is a configurable RTOS designed for resource constrained and embedded systems. Embox's main idea is to use Linux software without Linux.



Achievements

-------------

* [VoIP phone on STM32F7Discovery based on PJSIP project](https://github.com/embox/embox/wiki/PJSIP-on-STM32)

* [Qt on STM32F7Discovery](https://github.com/embox/embox/wiki/Qt-on-STM32)

* [OpenCV on STM32F769i board](https://github.com/embox/embox/wiki/OpenCV-on-STM32)

* A lot of programming languages are available: Python, Lisp, Java (phoneme), TCL, Ruby, Lua, JS, Scheme

* SSHD based on Dropbear project

* Mesa3d

* Quake3

* zeromq, qpid

* ...



Key features

---------------

* POSIX-compliant

* C++ support

* File systems: FAT, ext2/3/4, ...

* TCP/IP: BSD sockets; supported protocols: UDP, HTTP, ARP, NTP, ICMP, ...

* Cross-platform: ARM, MIPS, x86, RISC-V, Microblaze, SPARC, PowerPC, E2K

* Popular platforms: STM32, i.MX6, RaPi, ...

* Provides popular desktop software on MCU (e.g. STM32): Qt, OpenCV, PJSIP, dropbear, ...

* Unix-like shell utilities: ls, cat, mount, ...

* Popular programming languages: java, python, lua, tcl, lisp, ruby, js, scheme



Contacts

---------------

Mailing lists:

* main (english): [email protected]

* russian: [email protected]



Telegram chats:

* main (english): https://t.me/embox_chat_en

* news:  https://t.me/embox_news

* russian: https://t.me/embox_chat



Documentation

---------------

* [Wiki](https://github.com/embox/embox/wiki)

* [PDF](https://github.com/embox/embox-docs/releases)

* [GitHub repository with source for docs](https://github.com/embox/embox-docs)



Getting started

---------------

Here's a quick overview on how to build and run Embox.



Required environment:

 - `gcc` and `make`

 - cross compiler for the target platform



### Preparing environment

For Debian-based systems (most packages are installed out of box though):

```

$ sudo apt-get install build-essential gcc-multilib curl libmpc-dev python

```



For Arch Linux:

```

$ sudo pacman -S make gcc-multilib cpio qemu

$ yay -S python2-bin

```



For Fedora Linux:

```

$ sudo dnf install make gcc cpio qemu patch curl python

```



For MAC OS X (requires [Homebrew](https://brew.sh/) installed):

```

$ brew install i686-elf-binutils i686-elf-gcc awk cpio qemu python

```



For any system with Docker (more info on wiki [Emdocker](https://github.com/embox/embox/wiki/Emdocker)):

```

$ ./scripts/docker/docker_start.sh

$ . ./scripts/docker/docker_rc.sh

```



### Building Embox

First of all:

```

$ git clone https://github.com/embox/embox.git embox

$ cd embox

```

Since Embox is highly configurable project, it is necessary to specify modules to be built and params for them. To build the OS `make` command is used.

All commands described below are called from the `embox` directory, which includes `src/`, `templates/`, ...



#### Configuring the project

For configuring it is necessary to specify parameters and modules supposed to be included into the system. There are two ways to set up a current config:



* `make confload- -` build artefacts generated in a fixed place

* `./confset  -` build artefacts maintained in project dependent working paths



While `make confload-` is used, files from the template's folder are copied into './conf' folder. You can modify them.

While `confset ` is used, files from the template's folder are copied into `./work//conf` folder and a link './conf' is created to `./work//conf`. This usage is suited for quick switching between your templates, because full rebuilds are avoided.

Moreover, working conf-settings are retained as well, when you switch build e.g. between real target and qemu and back again. Only downside of using the confset method: more SSD/HDD usage, dependent on number of parallel projects.



Embox has several templates prepared, to list them use the following command:

```

$ make confload

```



The simplest way to load a template is to specify its name in the command:



`$ ./confset `



or

```

$ make confload-

```



For the quick overview you can use one of `qemu` templates that exist for most architectures, that is, *`x86/qemu`* for x86:



`$ ./confset x86/qemu`    _(yet no autocomplete/-suggest when only a part is typed: to Do)_



or

```

$ make confload-x86/qemu

```



#### Building the image

After configuring the project just run `make` to build:

```

$ make

```



### Running on QEMU

The resulting image can now be run on QEMU. The simplest way is to execute `./scripts/qemu/auto_qemu` script:

```

$ sudo ./scripts/qemu/auto_qemu

```

`sudo` is requried to setup a TUN/TAP device necessary to emulate networking.



After the system is loaded, you’ll see the `embox>` prompt, now you are able to run commands.

For example, `help` lists all existing commands.



To test the connection:

```

ping 10.0.2.16

```

If everything's fine, you can connect to the Embox terminal via `telnet`.



To exit Qemu type ctrl + A and X after that.



### Debugging

You can use the same script with *-s -S -machine accel=tcg* flags for debugging:

```

$ sudo ./scripts/qemu/auto_qemu -s -S -machine accel=tcg

```

After running that QEMU waits for a connection from a gdb-client. Run gdb in the other terminal:

```

$ gdb ./build/base/bin/embox

...

(gdb) target extended-remote :1234

(gdb) continue

```

The system starts to load.



At any moment in gdb terminal you can type ctrl + C and see the stack of the current thread (`backtrace`) or set breakpoints (`break `, `break :`).



### Other architectures

Embox supports the following CPU architectures: x86, ARM, Microblaze, SPARC, PPC, MIPS.



In order to work with architectures other than x86 you'll need a cross compiler.

After installing the cross compiler just repeat the step above, starting with configuring:

```

make confload-/qemu

make

sudo ./scripts/qemu/auto_qemu

```

The output is quite the same as in the case of the x86 architecture.



#### Networking support

Embox supports networking on qemu x86, ARM, MIPS and Microblaze.