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QEMU

4,375 bytes added, 10:06, 31 August 2012
→‎Board Emulation
= '''QEMU on IGEP Boards''' =
 
[http://wiki.qemu.org/Main_Page '''QEMU''']  is a generic and open source machine emulator and virtualizer.
 
When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.
 
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/QEMUcomponent/zoo/item/0001qemu-IGEP_QEMU_support.path emulator link ]and after that apply the patch as: <pre>$ cd qemu-linaro $ patch -p1 &lt; 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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Boot&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Start&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; End&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Blocks&nbsp;&nbsp; Id&nbsp; System<br>  igep-nano.img1&nbsp;&nbsp; *&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; 63&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 106494&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 53232&nbsp;&nbsp;&nbsp; c&nbsp; FAT32 LBA (Boot)<br>  igep-nano.img2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 106496&nbsp;&nbsp;&nbsp;&nbsp; 1048575&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 470016&nbsp;&nbsp; 83&nbsp; Linux (Root filesystem)<br>  Optionally you can mount the 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 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>
$ cd qemu-linaro m&nbsp;: Memory assigned to the Virtualized board in Mega Bytes.
$ patch -p1 &lt;&nbsp;0001-IGEP_QEMU_support[[Image:QEMU boot.path png|thumb|center]]
Configure == 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 &gt;&gt; igep-nano.img </pre> Next step it's modify the sources partition table information. We will use cfdisk utility for build with modify the information. <pre>$ sudo cfdisk igep-nano.img </pre> Next step it's select your rootfs partition as this commandpicture shows  [[Image: Cfdisk change size partition.png|thumb|center]]Select the menu '''RESIZE''' and select '''CHANGE&nbsp;SIZE'''&nbsp;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.
$&nbsp;./configure --target-list=arm-softmmu --prefix=<span style="color: rgbWe will write the changes to the disk using the '''commit''' menu option and select '''YES''' (255, 0, 0confirm the changes);">/opt/qemu-linaro</span> .
Build The next step it's update the sources: file-system structure. <pre>$ 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
<br> $ sudo resize2fs /dev/loop0
== Board Emulation ==$ sudo losetup -d /dev/loop0 </pre> Now you should see your new partition with your wished new size.
aaaaaa[[Category:Development_tools|QEMU]]
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