diff --git a/README.md b/README.md
index e87ca4b8baa3..9b547325e650 100644
--- a/README.md
+++ b/README.md
@@ -55,18 +55,24 @@
Following is the instruction on how to build an [(ONIE)](https://github.com/opencomputeproject/onie) compatible network operating system (NOS) installer image for network switches, and also how to build docker images running inside the NOS. Note that SONiC image are build per ASIC platform. Switches using the same ASIC platform share a common image. For a list of supported switches and ASIC, please refer to this [list](https://github.com/Azure/SONiC/wiki/Supported-Devices-and-Platforms)
# Hardware
-Any server can be a build image server. We are using a server with 1T hard disk. The OS is Ubuntu 16.04.
+Any server can be a build image server. We are using a server with 1T hard disk. The OS is Ubuntu 16.04 and Ubuntu 20.04.
## Prerequisites
-Install pip and jinja in host build machine, execute below commands if j2/j2cli is not available:
+For Ubuntu 16.04, Install pip and jinja in host build machine, execute below commands if j2/j2cli is not available:
sudo apt-get install -y python-pip
sudo python2 -m pip install -U pip==9.0.3
sudo pip install --force-reinstall --upgrade jinja2>=2.10
sudo pip install j2cli
-Configure your system to allow running the 'docker' command without 'sudo':
+For Ubuntu 20.04,
+```shell
+sudo apt install -y python3-pip
+pip3 install --user j2cli
+```
+
+Install [Docker](https://docs.docker.com/engine/install/) and configure your and configure your system to allow running the 'docker' command without 'sudo':
Add current user to the docker group
`sudo gpasswd -a ${USER} docker`
Log out and log back in so that your group membership is re-evaluated
@@ -74,7 +80,7 @@ Configure your system to allow running the 'docker' command without 'sudo':
## Clone or fetch the code repository with all git submodules
To clone the code repository recursively, assuming git version 1.9 or newer:
- git clone https://github.com/zhengweitang-zwt/sonic-buildimage.git
+ git clone -b otn_legacy https://github.com/sonic-otn/sonic-buildimage.git
## Usage
@@ -101,8 +107,8 @@ To build SONiC installer image and docker images, run the following commands:
# Build SONiC-OTN VS image
BUILD_MULTIASIC_KVM=y make target/sonic-vs.img.gz
- # RUN the virtual image
- Please refer to the `SONiC-OTN-VM.md` file to run it on virtual machine
+## RUN the virtual image
+Please refer to the [SONiC-OTN-VM.md](./SONiC-OTN-VM.md) file to run it on a virtual machine
## Usage for ARM Architecture
To build Arm32 bit for (ARMHF) plaform
diff --git a/SONiC-OTN-VM.md b/SONiC-OTN-VM.md
index b144ff4b5efb..b6a10750f54b 100644
--- a/SONiC-OTN-VM.md
+++ b/SONiC-OTN-VM.md
@@ -1,51 +1,38 @@
-# How to Build AONOS Virtual Machine
-
-
-1. Clone sonic-buildimage repo
+# Prerequisites
+* Install qemu
```
-git clone git@github.com:zhengweitang-zwt/sonic-buildimage.git
+sudo apt-get install qemu-kvm
```
-2. Clone sub-repos
+or
```
-make init
+brew install qemu
```
-3. Config platform type
-
-```
-BUILD_MULTIASIC_KVM=y BUILD_LINUX_KERNEL=y make configure PLATFORM=vs
-```
-4. Build kvm image
+* download sonic-otn virtual images
+1. download ONIE image `onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso`
+```shell
+curl https://sonicstorage.blob.core.windows.net/packages/onie/onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso\?sv\=2020-04-08\&st\=2021-08-27T22%3A41%3A07Z\&se\=2030-08-28T22%3A41%3A00Z\&sr\=b\&sp\=r\&sig\=zyaX7rHnE5jXldpgrnWq1nvsfmMTrVCSuESZqrIxDLc%3D --output onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso
```
-make target/sonic-vs.img.gz
-```
-
-5. Get vm binaries
-```
-ONIE image: onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso
-Refer to `platfrom/vs/onie.mk`, you can download it from https://sonicstorage.blob.core.windows.net/packages/onie/onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso?sv=2020-04-08&st=2021-08-27T22%3A41%3A07Z&se=2030-08-28T22%3A41%3A00Z&sr=b&sp=r&sig=zyaX7rHnE5jXldpgrnWq1nvsfmMTrVCSuESZqrIxDLc%3D
-
-AONOS image: sonic-4asic-vs.img, sonic-installer.img
-you can find the `sonic-4asic-vs.img` in the root folder of your project, and `sonic-4asic-vs.img` in the `target` folder
-```
+2. download installer images `sonic-installer.img` and `sonic-4asic-vs.img`
+download these images from the github [actions](https://github.com/sonic-otn/sonic-buildimage/actions/workflows/otn-legacy-vs-image-build.yml) artifacts, for example this workflow [build#5](https://github.com/sonic-otn/sonic-buildimage/actions/runs/6740732168)
+
+* (optional) build sonic-otn virtual images
+Build these images with steps in [readme](./README.md). Then you can find the `sonic-installer.img` and `sonic-4asic-vs.img` in the root and `target` folder
# How to Start a Virtual Machine
-1. Install qemu
-```
-sudo apt-get install qemu-kvm
+1. Start VM via qemu
```
+gunzip -k sonic-4asic-vs.img.gz
-2. Start VM via qemu
-```
-sudo qemu-system-x86_64 -m 3072 -name onie -accel hvf -boot order=cd,once=d -cdrom ./onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso -device e1000,netdev=onienet -netdev user,id=onienet,hostfwd=:0.0.0.0:3040-:22 -vnc 0.0.0.0:0 -vga std -drive file=./sonic-4asic-vs.img,media=disk,if=virtio,index=0 -drive file=./sonic-installer.img,if=virtio,index=1 -serial telnet:127.0.0.1:7000,server
+sudo qemu-system-x86_64 -m 3072 -name onie -accel hvf -boot order=cd,once=d -cdrom ./onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso -device e1000,netdev=onienet -netdev user,id=onienet,hostfwd=:0.0.0.0:3040-:22 -vga std -drive file=./sonic-4asic-vs.img,media=disk,if=virtio,index=0 -drive file=./sonic-installer.img,if=virtio,index=1 -serial telnet:127.0.0.1:7000,server
```
3. Open a new terminal, use console to login ONIE.
@@ -54,10 +41,8 @@ telnet 127.0.0.1 7000
```
4. Choose entry: `ONIE: Embed ONIE`
-
5. Choose entry: `ONIE: Install OS`
-
6. Wait until AONOS image installed.
@@ -70,16 +55,11 @@ ONIE:/ # blkid
/dev/vda2: LABEL="ONIE-BOOT" UUID="e0f5d6f2-64aa-4501-8123-62bed94e04ee"
```
-
7. reboot
```
ONIE:/ # reboot
```
-8. Boot from SONiC-OS partition.
-
-
-
# How to Login Virtual Machine
1. Connect AONOS VM via console
@@ -103,12 +83,6 @@ telnet 127.0.0.1 7000
ssh root@localhost -p 3040
```
-# How does Virtual Machine simulate line-card and driver
-
-
-
-
-
# AONOS CLI Demo
1. Show line-cards info