https://gist.github.com/mrvn/a9e596aa4d02a5db0b9d0e8f04ac5b37
a pi4 dtb file

interrupt maps
https://www.devicetree.org/open-firmware/practice/imap/imap0_9d.pdf

pci bindings
https://www.devicetree.org/open-firmware/bindings/pci/pci2_1.pdf

https://elinux.org/images/f/f9/Petazzoni-device-tree-dummies_0.pdf

https://docs.rs/device_tree/1.1.0/device_tree/

overall
https://readthedocs.org/projects/devicetree-specification/downloads/pdf/stable/

https://saurabhsengarblog.wordpress.com/2015/11/28/device-tree-tutorial-arm/

https://www.kernel.org/doc/Documentation/devicetree/bindings/input/gpio-keys.txt

cpu release addr
https://android.googlesource.com/kernel/msm/+/android-7.1.0_r0.2/Documentation/devicetree/bindings/arm/cpus.txt#204


https://github.com/raspberrypi/rpi-eeprom/pull/273
> /proc/device-tree/chosen/bootloader/version is populated in the latest firmware and should be used in preference to vcgencmd bootloader_versions because it does not depend on VCHI and is non-blocking.