CWOS: A Tiny ARM-based OS

CWOS is still under development. Currently it can echo user's input through UART channel to demonstrate its IRQ handling mechanism and UART driver.

• Target platform: QEMU emulated ARM Versatile Platform Board
  • CPU: ARM 926EJ-S
  • Memory: 128 MB
• Host environment
  • Verified host OS
    • Ubuntu 14.04 x64
  • QEMU emulator
    • Ubuntu default build qemu-system-arm
  • Cross compile toolchain
    • Ubuntu package gcc-arm-none-eabi

• Relocation at boot time
• IRQ handling
• Basic UART driver
• Partial C-style string library implementation
• printk() support for debugging
• Non-recursive Make design

• Kernel space (128M): 0 ~ 0x08000000
• IO space: 0xD0000000 ~ 0xD01F5000

1. Download qemu and toolchain apt-get install qemu-system-arm gcc-arm-none-eabi in Ubuntu.
2. git clone https://github.com/waynecw/cwos . to retreive source code
3. cd cwos; make
4. make qemu to execute CWOS in QEMU
5. make qemu-debug to execute CWOS in QEMU for attaching GDB.