When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests.
QEMU documentation can be found [http://wiki.qemu.org/Manual here].<br>
== Build QEMU with IGEP support ==
$ [http://git.linaro.org/gitweb?p=qemu/qemu-linaro.git;a=summary git clone git://git.linaro.org/qemu/qemu-linaro.git]
Download IGEP support patch for QEMU from this [http://downloadswww.igepisee.esbiz/component/zoo/QEMUitem/0001qemu-IGEP_QEMU_support.path emulator link ]and after that apply the patch as: <pre>$ cd qemu-linaro $ patch -p1 < 0001-IGEP_QEMU_support.path</pre> Configure the sources for build with this command: <pre>$ ./configure --target-list=arm-softmmu --prefix=/opt/qemu-linaro</pre> Build the sources: <pre>$ make </pre> Install QEMU: <pre>$ make install</pre> Optionally you can download from [http://www.isee.biz/component/zoo/item/qemu-emulator here] the QEMU binaries, we suggest install it under /opt directory with the right user execution permissions.<br> == Board Emulation == Go to your qemu install directory.<br> <pre>$ cd /opt/qemu-linaro/bin</pre> We provide a QEMU ready image based on Ubuntu/Linaro Nano (Oneric 11.11) image, it can be download from [http://www.isee.biz/component/zoo/item/qemu-emulator here] (first uncompress it).<br> The image has 2 partitions (you can see the partitions using fdisk -ul command as: fdisk -ul igep-nano.img)<br> Device Boot Start End Blocks Id System<br>
$ cd qemuigep-linaro nano.img1 * 63 106494 53232 c FAT32 LBA (Boot)<br>
$ patch igep-p1 nano.img2 <nbsp; 0001-IGEP_QEMU_support.path 106496 1048575 470016 83 Linux (Root filesystem)<br>
Configure Optionally you can mount the sources partitions in you host PC and modify the content as:<br> <pre>First Partition: $ mount -o loop,offset=$[63*512] igep-nano.img /mnt/tmp</pre><pre>Second Partition: $ mount -o loop,offset=$[106496*512] igep-nano.img /mnt/tmp</pre> Now you're ready for build execute the emulator in a console with this command: <br> <pre>qemu-system-arm -M igep -m 512 -clock unix -serial stdio -drive file=igep-nano.img,if=sd,cache=writeback -usb -monitor telnet:localhost:7100,server,nowait,nodelay -device usb-kbd -device usb-mouse</pre> Parameters:<br> -m : Memory assigned to the Virtualized board in Mega Bytes. [[Image:QEMU boot.png|thumb|center]] == Tips == === Resize Rootfs Partition === We will resize our rootfs partition adding 1 GB at end. First we create a new raw file using qemu-img as: <pre>$ qemu-img create -f raw addon.raw 1G </pre> With addon.raw we concatenate it at end of our image file as: <pre>$ cat addon.raw >> igep-nano.img </pre> Next step it's modify the partition table information. We will use cfdisk utility for modify the information. <pre>$ sudo cfdisk igep-nano.img </pre> Next step it's select your rootfs partition as this picture shows [[Image:Cfdisk change size partition.png|thumb|center]]Select the menu '''RESIZE''' and select '''CHANGE SIZE''' option. [[Image:Cfdisk change size partition option.png|thumb|center]]Select resize at '''END'''. [[Image:Cfdisk resize end.png|thumb|center]]Enter the MAX new size and press enter key.
$ ./configure --target-list=arm-softmmu --prefix=<span style="color: rgbWe will write the changes to the disk using the '''commit''' menu option and select '''YES''' (255, 0, 0confirm the changes);">/opt/qemu-linaro</span> .
Build The next step it's update the sources: file-system structure. <pre>$ sudo losetup /dev/loop0 igep-nano.img -o $[106496*512]
$ make sudo e2fsck -f /dev/loop0
Install QEMUe2fsck 1.41.14 (22-Dec-2010)rootfs: recovering journalPass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 5: Checking group summary information
$ make install rootfs: ***** FILE SYSTEM WAS MODIFIED *****rootfs: 11969/5579872 files (0.6% non-contiguous), 1126338/22491136 blocks
Optionally you can download from [http:$ sudo resize2fs /dev/downloads.igep.es/QEMU/qemu-linaro.tar.gz here] the QEMU binaries.<br> loop0
== Board Emulation ==$ sudo losetup -d /dev/loop0 </pre> Now you should see your new partition with your wished new size.
./qemu-system-arm -M igep -m 512 -clock unix -serial stdio -drive file=/home/mcaro/Projects/myigep/workspace/igep-dsp-gst-framework/igep-ubuntu-desktop.img,if=sd,cache=writeback -usb -usbdevice host[[Category:usb.1:80ee:cafe -monitor telnet:localhost:7100,server,nowait,nodelayDevelopment_tools|QEMU]]
