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precompiled-trees/README.md
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@ -28,23 +28,46 @@ Each folder contains a `.dtb` file, which is the compiled device tree itself, pl
* Has the console uart, 1x I2C. 1xSPI * Has the console uart, 1x I2C. 1xSPI
* 15 unassigned GPIO pins, 3 pre-assigned to pinctl * 15 unassigned GPIO pins, 3 pre-assigned to pinctl
# Getting the DTB files
Clone this repo:
```console
$ git clone https://github.com/easytarget/MQ-Pro-IO.git
$ cd MQ-Pro-IO
```
# Examining the current DTB pin mappings: # Examining the current DTB pin mappings:
In the [tools](../tools) folder there is a python script called `list-pins.py`. In the [tools](../tools) folder there is a python script called `list-pins.py`.
To run it you need to be in that directory, then run `python3 list-pins.py MangoPi-MQ-Pro` to see a map of the current pin assignments (the same map I use in `.gpio` files in the folders above.) To run it you need to be in that directory, then run:
`python3 list-pins.py MangoPi-MQ-Pro`
* This produces the same map I use in the documentation and `.gpio` files in the folders above.
# Install and use # Install the Device Tree
Installing is simple, clone this repo on to the MQ pro and, as root, copy the desired `.dtb` file to the `/boot/dbts` folder. Installing is, in principle, simple.
* Clone this repo on to the MQ pro and, as root, copy the desired `.dtb` file to the `/boot/dbts` folder.
* Then make a soft link in the root of the /boot folder named `dtb-mqpro` that points to the file you just copied.
```console
$ sudo cp precompiled-trees/generic/6.8.0-31-generic.dtb /boot/dtbs/
$ cd /boot
$ sudo ln -s dtbs/6.8.0-31-generic.dtb dtb-mqpro
```
Then make a soft link in the root of the /boot folder named `dtb-mqpro` that points to the file you just copied. Finally, edit the `/boot/grub/grub.cfg` file to use the new DTB for the default 'Ubuntu' target:
* `sudo vi /boot/grub/grub.cfg`
Finally, edit the `/boot/grub/grub.cfg` file to use the new DTB for the default 'Ubuntu' target. * Look for the first block that begins with: `menuentry 'Ubuntu'`
* Comment out the existing entry and add a new one:
```console
# devicetree /boot/dtb-6.8.0-31-generic
devicetree /boot/dtb-mqpro
```
Reboot! Reboot!
After rebooting you can re-run **list-pins.py** from above to verify the new mappings. After rebooting you can re-run **list-pins.py** from above to verify the new mappings.
If you have errors rebooting (maybe a corrupt file if you rebuilt it etc..) you need to either boot using a USB serial adapter on the console pins and select the recover image (or edit the command and revert to the generic `.dtb`). Or remove the SD card, mount the /boot partition and edit the `grub/grub.cfg` file there. If you have errors rebooting (maybe a corrupt file if you rebuilt it etc..) you need to either boot using a USB serial adapter on the console pins and select the recovery image, or, in grub, edit the command and revert to the generic `/boot/dtb`.
As a last resort you may have to remove the SD card, mount the `/boot` partition and edit `grub/grub.cfg` there.
* !! The 'default' dtb supplied by ubuntu should always be softlinked as `/boot/dtb`, so putting `devicetree /boot/dtb` in grub in place of the custom `.dtb` should work and is predictable (no version numbers etc).
## Making Permanent: ## Making Permanent:
(As Root) Edit: `/etc/grub.d/10_linux` line 458 to say: (As Root) Edit: `/etc/grub.d/10_linux` line 458 to say:
@ -62,3 +85,4 @@ Note that we are adding `dtb-mqpro` to the start of this list, this is the 'sear
fi fi
done done
``` ```
When Grub next rebuilds it *should* make the new DTB the default for all entries now. (this is untested, as of this writing there have not been any kernel upgrades to test them on)