A minimal kernel for the Arduino Due
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README.md

The Ardix Kernel

This is the source tree of Ardix, a microkernel for various Arduino boards that implements some core concepts of the Unix philosophy. Please note that this project is not affiliated with or endorsed by Arduino s.r.l. in any way. Only ARM-based boards are supported at the moment.

License

Copyright (c) 2020, 2021 Felix Kopp owo@fef.moe.

Ardix is non-violent software: you may only use, redistribute, and/or modify it under the terms of the CNPLv6+ as found in the LICENSE file in the source code root directory or at https://git.pixie.town/thufie/CNPL.

Ardix comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. See the CNPLv6+ for details.

Compiling

Prerequisites

  • The GNU toolchain, including
    • arm-gcc
    • arm-ld
    • arm-objcopy
  • GNU make
  • A programmer (bossac recommended)
  • A Unix-like shell (sorry Microsoft lackeys, you can use the Windows Subsystem for Linux for compiling but probably not for flashing)

Configuration

Right now, you have to manually define environment variables:

  • ARM_CC: Full path to arm-none-eabi-gcc. If unset, we will search for it in your PATH.
  • ARM_LD: Full path to arm-none-eabi-ld. If unset, we will search for it in your PATH.
  • ARM_OBJCOPY: Full path to arm-none-eabi-objcopy. If unset, we will search for it in your PATH.
  • ARCH: Codename for the target architecture. This is mandatory. The following architectures are currently supported:
    • at91sam3x8e (Arduino Due)
  • EXTRA_CFLAGS: Any additional arguments that should be passed to the compiler.
  • EXTRA_LDFLAGS: Any additional arguments that should be passed to the linker.

Build

To build the EEPROM image, execute the following command:

# Replace <target> with one of the target architectures from the list above
ARCH='<target>' make ardix.bin

This will create the ardix.bin file, which can be passed to bossac for flashing. If you are using an Arduino DUE (at91sam3x8e), make sure to connect the USB cable to the programmer port (the one closer to the power jack).

# Replace <tty> with the name of the tty device in /dev
# that is connected to your Arduino
bossac -e -w -v -b -a --port=<tty> ardix.bin

Please refer to bossac --help for more information on how to use it.