Standard Setup of Toolchain for Linux

Install Prerequisites

To compile with ESP8266_RTOS_SDK you need to get the following packages:

• CentOS 7:

  sudo yum install gcc git wget make ncurses-devel flex bison gperf python pyserial
  

• Ubuntu and Debian:

  sudo apt-get install gcc git wget make libncurses-dev flex bison gperf python python-serial
  

• Arch:

  sudo pacman -S --needed gcc git make ncurses flex bison gperf python2-pyserial
  

Toolchain Setup

ESP8266 toolchain for Linux is available for download from Espressif website:

• for 64-bit Linux:

  https://dl.espressif.com/dl/xtensa-lx106-elf-gcc8_4_0-esp-2020r3-linux-amd64.tar.gz

• for 32-bit Linux:

  https://dl.espressif.com/dl/xtensa-lx106-elf-gcc8_4_0-esp-2020r3-linux-i686.tar.gz

1. Download this file, then extract it in ~/esp directory:

   mkdir -p ~/esp
   cd ~/esp
   tar -xzf ~/Downloads/xtensa-lx106-elf-linux64-1.22.0-100-ge567ec7-5.2.0.tar.gz
   

2. The toolchain will be extracted into ~/esp/xtensa-lx106-elf/ directory.

   To use it, you will need to update your PATH environment variable in ~/.profile file. To make xtensa-lx106-elf available for all terminal sessions, add the following line to your ~/.profile file:

   export PATH="$PATH:$HOME/esp/xtensa-lx106-elf/bin"
   

   Alternatively, you may create an alias for the above command. This way you can get the toolchain only when you need it. To do this, add different line to your ~/.profile file:

   alias get_lx106='export PATH="$PATH:$HOME/esp/xtensa-lx106-elf/bin"'
   

   Then when you need the toolchain you can type get_lx106 on the command line and the toolchain will be added to your PATH.

   Note

   If you have /bin/bash set as login shell, and both .bash_profile and .profile exist, then update .bash_profile instead.

3. Log off and log in back to make the .profile changes effective. Run the following command to verify if PATH is correctly set:

   printenv PATH
   

   You are looking for similar result containing toolchain’s path at the end of displayed string:

   $ printenv PATH
   /home/user-name/bin:/home/user-name/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/user-name/esp/xtense-lx106-elf/bin
   

   Instead of /home/user-name there should be a home path specific to your installation.

Permission issues /dev/ttyUSB0

With some Linux distributions you may get the Failed to open port /dev/ttyUSB0 error message when flashing the ESP8266.

If this happens you may need to add your current user to the correct group (commonly “dialout”) which has the appropriate permissions:

sudo usermod -a -G dialout $USER

In addition, you can also use “sudo chmod” to set permissions on the “/dev/ttyUSB0” file before running the make command to resolve:

sudo chmod -R 777 /dev/ttyUSB0

Next Steps

To carry on with development environment setup, proceed to section Get ESP8266_RTOS_SDK.

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