Tool to visualize the device tree file (dtb) used by the Linux kernel?

dtc -O dts

sudo apt-get install device-tree-compilerdtc -I dtb -O dts -o a.dts a.dtb

gives a well indented textual representation of the device tree a.dts, which is easy to understand with a text editor. Or dump it to stdout with:

dtc -I dtb -O dts -o - a.dtb

The source code for dtc is present in the kernel tree itself at scripts/dtc/dtc.c

Tested on Ubuntu 16.04, with the device tree of Raspberry Pi 2, found in the first partition of 2016-05-27-raspbian-jessie-qemu.img.

For convenience I have in my .bashrc:

dtbs() ( dtc -I dtb -O dts -o - "$1" )dtsb() ( dtc -I dts -O dtb -o - "$1" )

dtc can also extract the DTS from /proc of a live kernel as shown at: https://unix.stackexchange.com/questions/265890/is-it-possible-to-get-the-information-for-a-device-tree-using-sys-of-a-running

On linux we can directly open dtb file by using fdtdump

fdtdump dtb_file.dtb > /tmp/test.txt 

You can try the Component inspector tool.

It is part of QorIQ Configuration Suite which is a plugin for Eclipse.

Download here.(Requires registration. Free to download.)

Personally as i am on the cmd-line most of the time, and quite addicted to vi, i find its built-in code folding capabilities are somewhat sufficient as long as the dts is properly indented.

Setup hot-keys commands to fold/expand blocks of code in vi
by adding the following lines to .vimrc :

nnoremap <silent> <F5> zfa}<CR>nnoremap <silent> <F6> zo<CR>

With the above setup, to fold a block/node, simply move the cursor onto any of its lines(except the title) and hit F5. To expand a folded block/node, move to the line with the folded title and hit F6.

Here is what a partially folded dts looks like in vi.