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+# Running RancherOS on Estuary D02 board
+
+## Requirements
+
+- RancherOS ARM rootfs image: [`rootfs_arm.tar.gz`](https://github.com/rancher/os/releases/download/v0.4.3/rootfs_arm.tar.gz)
+- Estuary D02 kernel: [`Image_D02`](http://download.open-estuary.org/AllDownloads/DownloadsEstuary/releases/2.1/linux/Common/D02/Image_D02)
+- Estuary D02 device tree: [`hip05-d02.dtb`](http://download.open-estuary.org/AllDownloads/DownloadsEstuary/releases/2.1/linux/Common/D02/hip05-d02.dtb)
+- Estuary Ubuntu ARM64 rootfs image: [`Ubuntu_ARM64.tar.gz`](http://download.open-estuary.org/AllDownloads/DownloadsEstuary/releases/2.1/linux/Ubuntu/Common/Ubuntu_ARM64.tar.gz)
+
+
+## Prepare the storage media
+
+Partition (optional) and format a USB drive or a SAS drive. The root partition should be formatted with ext4 filesystem.
+
+
+## Prepare the root filesystem
+
+Mount the ext4 formatted root partition (or the full disk) to an empty directory on your Linux machine (e.g. `/mnt/d02_rootfs`).
+
+Unpack `rootfs_arm.tar.gz` into the root partition:
+```
+$ cd /mnt/d02_rootfs
+$ sudo tar -xzf ~/Downloads/rootfs_arm.tar.gz
+```
+Unpack `/lib/modules` and `/lib/firmware` from Ubuntu_ARM64.tar.gz into the root partition:
+```
+$ sudo tar -xzf ~/Downloads/Ubuntu_ARM64.tar.gz lib/modules lib/firmware
+```
+Unmount the root partition and hook the drive to the D02 board.
+
+
+## Edit `grub.cfg`
+
+Here's an example grub menu entry for RancherOS:
+```
+menuentry "D02 RancherOS USB" --id d02_ros_usb {
+    set root=(tftp,192.168.3.1)
+    linux /Image_D02 root=/dev/sda2 rootfstype=ext4 rw init=/init console=ttyS0,115200 earlycon=uart8250,mmio32,0x80300000 ip=dhcp rancher.password=rancher quiet
+    devicetree /hip05-d02.dtb
+}
+```
+
+Replace `192.168.3.1` with your TFTP server IP-address, `/dev/sda2` with your root partition device. Kernel parameter `rancher.password=rancher` sets `rancher` user password to `rancher`.
+
+
+## Put the boot files into the boot directory
+
+Place the grub config, kernel image and the device tree blob onto the boot dir. This is typically a TFTP root dir on a PXE boot server:
+```
+$ sftp root@192.168.3.1:/var/lib/tftpboot <<< 'put ./tmp/tftp/*'
+```
+
+## Enjoy!
+
+You can now turn on your D02 and it will boot with RancherOS.
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