https://github.com/serg3k/device-tree-reader

Locate .dtb objects in binary files and dump them
https://github.com/serg3k/device-tree-reader

bootloader device-tree dtb fdt openbsd-wip

Last synced: about 1 month ago
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Locate .dtb objects in binary files and dump them

• Host: GitHub
• URL: https://github.com/serg3k/device-tree-reader
• Owner: serg3k
• Created: 2022-05-08T20:59:43.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-06-21T14:27:04.000Z (over 2 years ago)
• Last Synced: 2024-11-19T22:51:24.840Z (about 1 month ago)
• Topics: bootloader, device-tree, dtb, fdt, openbsd-wip
• Language: C
• Homepage:
• Size: 10.7 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Intro

I've built this small utility because I thought I need to locate Device Tree 

objects in binaries and dump them in text-form.

This helped me when I was running OpenBSD 7.1 on arm-based PineBook Pro.

I copy-pasted fdt.c and fdt.h from OpenBSD's 

[efiboot](https://github.com/openbsd/src/blob/master/sys/arch/arm64/stand/efiboot/). 

I did some lame adjustments for the sake of convenience.

It could be that using `libfdt` was cleaner and better option, but back then I did not know 

it actually exists. `efiboot` code was pretty simple and easy to understand 

so I just reused it.

For the time being I only built it in OpenBSD using native make(1).

Perhaps I will add support for other BSDs and Linux/MacOs.

Note: it needs to be checked whether `fdtdump` or `dtc -o` is a better fit for this task.

In this case, current utility could be minimized to only locate dtb objects in a given binary 

and dump them as separate files. (text file with list of dumped object, their offset and 

size should then also be generated).

# Bulding

* [x] OpenBSD

* [ ] FreeBSD

* [ ] NetBSD

* [ ] MacOS

* [ ] Linux

I used to build it on OpenBSD using [make(1)](https://man.openbsd.org/make). GNU make is currently 

not supported and Linux build has not been tested.

```

make 

```

To build on Linux/MacOS, use this:

```

make 

```

# Running

```

./main /usr/local/...

```