# Environment Configuration
This article guides you through configuring the CAN bus on a Orange Pi 5 Max board with RK3588 chip. The necessary environment configuration and steps are outlined below.
## Step 1: Access U-Boot Configuration File
First, access the U-Boot configuration file at `/etc/default/u-boot` using a text editor with administrator privileges. This file is responsible for U-Boot configuration.
## Step 2: Modify U-Boot File Contents
Remove comments from the required lines by deleting the `#` symbol at the beginning of each line. Specifically, uncomment the lines `U_BOOT_FDT` and `U_BOOT_FDT_OVERLAYS` to enable loading the device tree file and firmware overlays.
## Step 3: Device Tree File Configuration
Configure the device tree file path by specifying the correct value for `U_BOOT_FDT`. The path may vary for different Orange Pi boards. To find the correct path, search for a file matching `rockchip/rk3588-orangepi-5-max.dtb` in the `/usr/lib/firmware/5.10.0-1012-rockchip/device-tree/` directory.
## Step 4: Firmware Overlays Configuration
Configure the firmware overlays by specifying the correct path for the `U_BOOT_FDT_OVERLAYS` variable. To find the correct files to include, search for files matching `rk3588-can*-m#.dtbo` in the `/usr/lib/firmware/5.10.0-1012-rockchip/device-tree/rockchip/overlay/` directory. Based on the Orange Pi 5 Max documentation, you need to select the correct files for CAN0 and CAN1 interfaces.
## Step 5: Update U-Boot Configuration and Reboot
Update the U-Boot configuration and reboot the board with the command `sudo u-boot-update`. This will apply the changes and restart the board.
## Step 6: Verify CAN Bus Configuration
After the reboot, use the command `ifconfig -a` to verify that the CAN0 and CAN1 interfaces are available.
## Step 7: Connect CAN Devices
Connect CAN receivers and analyzers or other configured CAN devices.
## Step 8: Test CAN Bus Communication
Use the tools `candump` and `cansend` to test CAN bus communication.