QEMU Basic. Create the Hardware System

Transcription

1 QEMU Basic In this simple Demo we shall be creating a simple Zynq HW project in , exporting to SDK to create the HDF file. This HDF file will be used as the base to create the Linux image in Petalinux. We can then use QEMU to test and explore its features. Create the Hardware System Create a project for ZC702 board Create a new BD based on the bellow image Generate output products Generate HDL Wrapper Export to SDK (This steps simply generate the HDF file used in the next steps)

2 Generate the Petalinux Image Change to the SDK folder of the Vivado project (where the HDF has been exported) Run the following commands petalinux-create --type project --template zynq --name sys_1 petalinux-config --get-hw-description project_1/project_1.sdk -p sys_1 petalinux-create --type apps --template c --name hello_world petalinux-config c rootfs Configure the rootfs to include the following elements o Apps -> [*] hello_world o Filesystem Packages -> net -> netcat -> [*] netcat o Filesystem Package -> console/network -> dropbear -> [*]dropbear o Filesystem Package -> console/network -> dropbear -> [*]dropbear-openssh-sftp-server Modify the DTS to add the PHY node /dts-v1/; /include/ "system-conf.dtsi" / { }; &gem0 { local-mac-address = [00 0a c0 12]; phy-handle = <&phy0>; phy-mode = "rgmii-id"; mdio { #address-cells = <1>; #size-cells = <0>; phy0: phy@7 { compatible = "marvell,88e1116r"; device_type = "ethernet-phy"; reg = <7>; }; }; }; Petalinux-build Note To verify the DTB was created correctly (or expected), you can use the command below and check the output file. cd sys_1/images/linux../../build/linux/kernel/xlnx-3.19/scripts/dtc/dtc -I dtb -O dts -o system.dts system.dtb

3 Run QEMU The QEMU is pre-compiled in Petalinux. Users can compile this themselves (See the Wiki for help here). For this demo, type the following command in the host machine in order to boot the built image. petalinux-boot --qemu kernel This will boot. You should see the following on your console (towards the end, and before the login). To test the hello_world app, type hello_world on the console (after QEMU image login). To terminate QEMU use the Ctrl + A & X QEMU can be run manually instead of using petalinux commands. More information about the arguments can be found in the command help doc or in the QEMU wiki page or Xilinx wiki page. You can see in the bellow image the QEMU command used by petalinux when running the kernel image and a custom run of hello_world application.

4 QEMU Networking QEMU emulates a small sub-network (or LAN, kinda) containing a DHCP server, a gateway and a DNS server. Everything we need to access the internet. There are also some optional components that can be added to this emulated network. The DNS and gateway back onto the host machines internet connection. This means that the QEMU VM session has internet access. The Following diagram (Wiki) shows the networking architecture: We can check the acquired network parameters by the VM. Note If you don t see the DNS and DCHP set up then you probably messed up your devicetree

5 The network connection can be used as normal, almost as if it were actually attached to the HOST network (If the machine running the QEMU has Xilinx network access). For example, we can use the wget command to download a files from the web. Download the crossroads homepage. wget web.xilinx.com We can also set up a proxy server to use the Xilinx proxy serverand download a released image from the Xilinx wiki page. export http_proxy=proxy.xilinx.com wget Note This link was correct as of writing this doc. To check the link go to the Wiki and under Download, verify the link address. Telnet Users can also connect to the QEMU via Telnet. For this purpose run the image with the following command, where <port> value is anything between 2000 and (make sure it is unique and not used by other instance). Once opened, telnet from the host machine to have access to the target image. petalinux-boot --qemu --kernel --qemu-args "-redir tcp:<port>: :23"

6 SSH QEMU guest session can be accessed through ssh as done with telnet. In this case ssh port have to be redirected when launching the guest image. Launch the Guest: petalinux-boot --qemu --kernel --qemu-args "-redir tcp:1400: :22" Launch the SSH session: ssh c aes128-cbc p 1400 root@localhost Note The RSA key of the booted linux is changed after reboot. So, beware of this. You can just do a vim.ssh/known_hosts and dd (delete the last key) TFTP QEMU also has a built in TFTP capability to allow for easy file transfer to/from guest machine to the host. To test this feature, create a directory with a new file on it and run the QEMU image sharing the folder with the TFTP server. mkdir public cd public echo "Hello There" > file.txt cd.. petalinux-boot qemu kernel qemu-args -tftp./public

7 SCP Other way to transfer files from the host machine to the target is using scp. To be able to use scp, QEMU have to been launched with the ssh tunnel redirected to the localhost (see SSH example). This way files can be send to the guest machine with the following command. Launch the Guest: petalinux-boot --qemu --kernel --qemu-args "-redir tcp:1400: :22" Send the file with scp: scp c aes128-cbc p 1400 public/file.txt root@localhost:/home/root

8 Multiple session Users can also connect two QEMU sessions and using the redir switch. Communication can be managed in a way that TX and RX between guest and host. petalinux-boot --qemu --kernel --qemu-args "-redir tcp:2500: :1440" petalinux-boot --qemu --kernel --qemu-args "-redir tcp:2501: :1550" Once both guest are running we can setup the scenario in two modes, Guest 1 as listener and Guest 2 as sender or in the opposite direction. Guest 1 as listener: nc l p 1440 Guest 2 as sender: nc Guest Guest Host Here, you can see that if I type Hello in guest2, it is sent to guest1. Also, if I type on guest1, it will be sent to guest2.