How to list the kernel Device Tree

If dtc is available on your platform (else, install the device-tree-compiler package), you can use:

dtc -I fs /sys/firmware/devicetree/base

The device tree is exposed as a hierarchy of directories and files in /proc. You can cat the files, eg:

find /proc/device-tree/ -type f -exec head {} + | less

Beware, most file content ends with a null char, and some may contain other non-printing characters.