Features

The system is very experimental, yet FreeNOS currently supports:

• Intel x86 (PC) and ARMv6/ARMv7 architectures (Raspberry Pi 1,2,3, Allwinner H2+/H3)
• Virtual memory
• Simple task scheduling
• Inter Process Communication (IPC)
• Symmetric Multi Processing with MPI support (via console and ethernet)

• Devices:

  • VGA/Keyboard consoles (also supported by Ed's libteken)
  • i8250 serial UART
  • PCI host controller
  • CMOS RTC clock
  • ATA host controller
  • Allwinner H2+/H3 ethernet controller
  • Loopback ethernet controller

• Filesystems:

  • Virtual file system (VFS)
  • Temporary file system (TmpFS)
  • Linnenbank file system (LinnFS)

• Networking (IP, UDP, ICMP, ARP)
• POSIX, ANSI C libraries
• Dynamic and Shared memory
• Fully automatic autotester
• Automated continuous integration using jenkins and Vagrant
• All sources documented with Doxygen
• User and kernel code written from scratch in C++
• Very small microkernel (~2K lines of C++ code including a tiny part in assembly)
• Builds with recent GCC, LLVM and SCons versions on POSIX systems