Difference between revisions of "Talk:QEMU"

Latest revision as of 11:09, 30 June 2010

Get/generate simulation images (old version = with ramdisk)

• In our tests we used the QEMU Versatile PB emulated hardware. To get a compatible Linux kernel for this board then:

 $ cd your_armadeus_view/
 $ wget http://people.debian.org/~aurel32/arm-versatile/vmlinuz-2.6.26-2-versatile

• get some useful environment variables:

 $ make shell_env
 $ source armadeus_env.sh

• in $ARMADEUS_ROOTFS_DIR/etc/inittab, comment following line:

 ttySMX0::respawn:/sbin/getty -L ttySMX0 115200,57600,38400 vt100

• Generate your Armadeus Rootfs as an EXT2 image:

 $ make menuconfig

Target filesystem options  ---> 
    [*] ext2 root filesystem
    ... (keep all default options)

 $ make

• be sure that your rootfs image is less than 16Mbytes (Ramdisk limit)

$ ls -al $ARMADEUS_BINARIES/*.ext2

• and zip it (we will use it as Ramdisk first):

 $ gzip -9 $ARMADEUS_BINARIES/apfxx-rootfs.arm.ext2

• Create a fake QEMU Hard disk image

 $ qemu-img create -f qcow rootfs.arm_nofpu2.img 20M

Launch it (old method)

• first time with ramdisk

[armadeus]$ qemu-system-arm -m 32 -M versatilepb -kernel vmlinuz-2.6.18-6-versatile \
    -initrd apf9328-rootfs.arm.ext2.gz -append "root=/dev/ram" -hda ./apf9328-rootfs.arm_nofpu2.img

• When system has booted, we will create the "hard disk" image. But first, if you are French, load a usable keymap:

 # loadkmap < /etc/i18n/fr.kmap

    =>    loqdk,qp < !etc!i&_n!fr:k,qp    on your PC keyboard

• then:

 # mkdir /tmp/dev
 # mknod /tmp/dev/sda b 8 0
 # mknod /tmp/dev/sda1 b 8 1
 # fdisk /tmp/dev/sda
   n p 1 <enter> <enter> w
 # mkfs.ext2 /tmp/dev/sda1

• Now we can mount our brand new file system:

 # mkdir /mnt/root
 # mount /tmp/dev/sda1 /mnt/root

Note: Following steps need you already configured tftp on your host and networking up and running

• And now we can populate it:

 # cd /mnt/root
 # tftp -g -r apf27-rootfs.arm.tar -l rootfs.arm.tar [HOST IP]
 # tar -xvf rootfs.arm.tar

• Finally halt the emulated system and, next boot, we can omit the initrd image:

[armadeus]$ qemu-system-arm -m 32 -M versatilepb -kernel vmlinuz-2.6.18-6-versatile \
    -append "root=/dev/sda1" -hda ./apf9328-rootfs.arm_nofpu2.img