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# The Little Kernel Embedded Operating System
The LK kernel is an SMP-aware kernel designed for small systems ported to a variety of platforms and cpu architectures.
See https://github.com/littlekernel/lk for the latest version.
### High Level Features
- Fully-reentrant multi-threaded preemptive kernel
- Portable to many 32 and 64 bit architectures
- Support for wide variety of embedded and larger platforms
- Powerful modular build system
- Large number of utility components selectable at build time
### Supported architectures
- ARM32
- - Cortex-M class cores (armv6m - armv8m)
- - ARMv7+ Cortex-A class cores
- ARM64
- RISC-V 32 and 64bit bit in machine and supervisor mode
- x86-32 and x86-64 386 up through modern cores
- microblaze
- MIPS
- OpenRISC 1000
### [TODO](docs/todo.md)
### To build and test for ARM on linux
1. install or build qemu. v2.4 and above is recommended.
2. install gcc for embedded arm (see note 1)
3. run scripts/do-qemuarm (from the lk directory)
4. you should see 'welcome to lk/MP'
This will get you a interactive prompt into LK which is running in qemu
arm machine 'virt' emulation. type 'help' for commands.
Note: for ubuntu x86-64:
sudo apt-get install gcc-arm-none-eabi
or fetch a prebuilt toolchain from
https://newos.org/toolchains/x86_64-elf-10.2.0-Linux-x86_64.tar.xz
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