Lemon

x86 32-bit minimal operating system
Copyright (C) Adrien RICCIARDI

Help

• Type help to the Lemon prompt shell to get help, commands list and information about system usage.
• Whole system documentation can be found in repository Documentation directory.

Technical documentation

Creating a cross toolchain to build Lemon on a non-x86 platform

1. Install some required tools.

sudo apt install bison flex gawk help2man libtool-bin texinfo

2. Build crosstool-NG, a tool that will automatically generate the toolchain.

# Change this variable by the lastest release version
CROSSTOOL_NG_VERSION=1.24.0

# Download latest stable version
wget http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-${CROSSTOOL_NG_VERSION}.tar.bz2
tar -xf crosstool-ng-${CROSSTOOL_NG_VERSION}.tar.bz2

# Build crosstool-NG to allow execution from build directory (this avoids installing it)
cd crosstool-ng-${CROSSTOOL_NG_VERSION}
./configure --enable-local
make

3. Configure toolchain generation by executing ./ct-ng menuconfig :

   • In menu Paths and misc options, set Prefix directory variable to /opt/Lemon_Toolchain.
   • Only if building for Raspberry Pi 4 : still in Paths and misc options menu, set Extra host compiler flags variable to -march=armv7-a -mfloat-abi=hard -mtune=cortex-a7.
   • In menu Target options, select x86 architecture in Target Architecture variable.
   • Exit saving the configuration.

4. Build and install toolchain. If an error happens, return to step 2 and build crosstool-NG from git.

# Allow crosstool-NG to access generated toolchain directory
sudo chmod 777 /opt

# Build and install toolchain
./ct-ng build