Difference between revisions of "Talk:QEMU"

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m (New page: ==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: <pre c...)
 
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  $ qemu-img create -f qcow rootfs.arm_nofpu2.img 20M
 
  $ qemu-img create -f qcow rootfs.arm_nofpu2.img 20M
 
</pre>
 
</pre>
 +
 +
==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
 +
 +
[[Image:qemu_apf_ramdisk.png]]
 +
 +
* When system has booted, we will create the "hard disk" image. But first, if you are French, load a usable keymap:
 +
<pre class="apf">
 +
# loadkmap < /etc/i18n/fr.kmap
 +
</pre>
 +
<pre class="host">
 +
    =>    loqdk,qp < !etc!i&_n!fr:k,qp    on your PC keyboard
 +
</pre>
 +
* then:
 +
<pre class="apf">
 +
# 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
 +
</pre>
 +
* Now we can mount our brand new file system:
 +
<pre class="apf">
 +
# mkdir /mnt/root
 +
# mount /tmp/dev/sda1 /mnt/root
 +
</pre>
 +
{{Note|Following steps need you already configured [[Communicate | tftp]] on your host and networking up and running}}
 +
 +
* And now we can populate it:
 +
<pre class="apf">
 +
# cd /mnt/root
 +
# tftp -g -r apf27-rootfs.arm.tar -l rootfs.arm.tar [HOST IP]
 +
# tar -xvf rootfs.arm.tar
 +
</pre>
 +
 +
* 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

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

Qemu apf ramdisk.png

  • 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 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