rOSka

• Probably useless hobby OS project
• Targets 32bit legacy systems with graphical framebuffer
• Boots with multiboot compatible bootloader, such as GRUB
• Assembles with FASM
• We'll probably use ext2 filesystem

GRUB disk creation

1. Format disk. Create ext2 partition
2. Create directory mnt and mount your partition to it

       mkdir mnt
       sudo mount /dev/sdX1 mnt
   

3. Intall grub using sudo grub-install --target=i386-pc --removable --boot-dir=mnt/boot /dev/sdX
4. Create config

       menuentry "rOSka" {
           multiboot /boot/roska.bin
           boot
       }
   

5. Copy assembled kernel to mnt/boot/roska.bin

extlinux disk creation

1. Format disk. Create ext2 partition and mark it active boot partition.
2. Add syslinux to bootloader sudo dd if=/usr/lib/syslinux/bios/mbr.bin of=/dev/sdX
3. Create directory mnt and mount your partition to it. Add boot directory to it.

       mkdir mnt
       sudo mount /dev/sdX1 mnt
       sudo mkdir mnt/boot
   

4. Install extlinux(syslinux)

   sudo extlinux --install --device /dev/sdX1 mnt/boot
   sudo cp /usr/lib/syslinux/bios/libcom32.c32 mnt/boot/
   sudo cp /usr/lib/syslinux/bios/mboot.c32 mnt/boot/
   

5. Create config

       DEFAULT rOSka
       LABEL rOSka
           SAY extlinux is booting rOSka...
           KERNEL /boot/mboot.c32
           APPEND /boot/roska.bin
   

6. Copy assembled kernel to mnt/boot/roska.bin
7. Have no video because naughty implementation doesn't tell us the framebuffer address :(

Oh yeah heres a montrosity I currently use. fasm roska.fasm && sudo mount /dev/sdd1 mnt/ && sudo cp roska.bin mnt/boot/roska.bin && sudo umount /dev/sdd1 && sudo sync && sudo qemu-system-i386 /dev/sdd