Boot Zephyr from SYSLINUX

1. Setup the virtual disk

   $ dd if=/dev/zero of=disk.img bs=$((1024 * 1024)) count=100
   $ parted -s disk.img mktable msdos mkpart primary 0 100% toggle 1 boot
   $ sudo losetup --show -Pf disk.img
   /dev/loopX
   

   $ sudo chown $LOGNAME:$LOGNAME /dev/loopX*
   $lsblk
   NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
   loopX 7:0 0 100M 0 loop 
   └─loopXp1 259:6 0 100M 0 loop
   $ mkfs.fat -F32 /dev/loopXp1
   $ sudo mount -o uid=$(id -u) /dev/loopXp1 /mnt
   

   • /dev/loopX , X can be 1,2,3,4, for this case /dev/loop5 .

2. Install SYSLINUX on the drive.

   $ sudo extlinux --device /dev/loopXp1 -i /mnt
   

3. Build Zephyr for QEMU.

   $ git clone http://github.com/zephyrproject-rtos/zephyr.git
   $ source zephyr-env.sh
   $ cmake -DBOARD=qemu_x86 -H$ZEPHYR_BASE/tests/kernel/fifo/fifo_timeout/ -Bbuild-x86-f
   $ make -C build-x86-f
   $ cp build-x86-f/zephyr/zephyr.elf /mnt
   

4. Create the SYSLINUX config.

   $ tee <<EOF > /mnt/syslinux.cfg
   timeout 0
   prompt 0
   default zephyr
   LABEL zephyr
   kernel elf.c32
   append zephyr.elf
   

5. Run QEMU on the disk.

   $ /opt/zephyr-sdk-0.9.5/sysroots/x86_64-pokysdk-linux/usr/bin/qemu-system-i386 \
   -m 1024 -cpu qemu32,+nx,+pae \
   -enable-kvm \
   -device isa-debug-exit,iobase=0xf4,iosize=0x04 \
   -clock dynticks -no-acpi -balloon none \
   -L /usr/share/qemu -bios bios.bin \
   -machine type=pc-0.14 \
   -serial stdio \
   -hda disk.img
   

   $ vncviewer 127.0.0.1:5900