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OpenBMC on qemu

This project aims to emulate a BMC system by running openBMC on qemu and controlling fan speed based on temperature.

Tools

In this section, you should mention the hardware or simulators utilized in your project.

  • Qemu
  • OpenBMC

Implementation Details

in order to add sensors to a system we must

1- Add I2C sensor config to devicetree in (openbmc/build/e3c246d4i/workspace/sources/linux-aspeed/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-e3c246d4i.dts) &i2c7 {status = "okay"; lm75@4d {compatible = "national,lm75"; reg = <0x4d>;};};

2- Add sensor recipe to openbmc/meta-asrock/meta-e3c246d4i/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/bus@1e78a000/i2c-bus@300/[email protected] and bbappend file. we can get the recipe from a similar machine like romulus

3- Build the OS image(as described below).

How to Run

prerequisites

libraries and packages requiered for openbmc

    sudo apt install git python3-distutils gcc g++ make file wget \
    gawk diffstat bzip2 cpio chrpath zstd lz4 bzip2

Building the Project

first we must clone openbmc from github

  git clone https://github.com/openbmc/openbmc
  cd openbmc

then we target our hardware

  . setup e3c246d4i

after that we build the image

  bitbake u-boot-aspeed && bitbake obmc-phosphor-image

Running the OS

first we must get qemu

  sudo apt-get install qemu-system-arm

then we change our directory to where the openbmc image is stored

  cd openbmc/build/e3c246d4i/tmp/deploy/images/e3c246d4i/

and the we run "image-bmc" with qemu

  qemu-system-arm -m 256 -M ast2500-evb -nographic \
    -drive file=image-bmc,format=raw,if=mtd \
    -net nic \
    -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443,hostfwd=udp:127.0.0.1:2623-:623,hostname=qemu

after the OS is booted we enter the username and password

  e3c246d4i login: root
  Password: 0penBmc

Results

in order to chech our temperature and fan controller we must check hwmon

  cd /sys/class/hwmon
  ls

here the first folder is our fan cotroller which has to profiles pwm1 and pwm2 and seven fans
image

the second entry is the temperature sensor which always shows zero because there is no real sensor! image

Related Links

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Authors

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