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Owen Carter
2024-05-06 17:57:57 +02:00
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device-tree/README.md
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# Rebuild dts tree fo MQ pro..
see:
https://manpages.ubuntu.com/manpages/focal/man1/dtc.1.html
https://forum.armbian.com/topic/29626-mango-pi-mq-pro-d1-device-tree-try-to-okay-serial/
https://github.com/torvalds/linux/tree/master/arch/riscv/boot/dts/allwinner
Start by `cd`'ing into this [device tree](device-tree) folder and editing your device tree.
https://github.com/ners/MangoPi/tree/d2589d8211a2f9ae57d88f2e2c4d6a449d668f9e/MangoPi/linux/arch/riscv/boot/dts/allwinner
You can use the generic `sun20i-d1-mangopi-mq-pro.generic.dts` already in the device tree folder as a basis, or start with one of the ones provided with my precompiled trees.
version from official armbian image?
https://github.com/smaeul/u-boot/tree/329e94f16ff84f9cf9341f8dfdff7af1b1e6ee9a/arch/riscv/dts
You may also need to modify `sun20i-d1.dtsi` since this is where pin mappings are declared; eg UART pin sets are defined in this include file and then used in the main tree file.
## Notes for re-generating MQ PRO device tree (`.dtb`)
My notes
* By default the Device Tree compiler (`/usr/bin/dtc`) should already be installed, as should the linux-headers for the kernel.
A full-on tutorial for device tree editing is far beyond the scope of both this document and author.
### compile the mq-pro dts with the current kernel headers
#### Terms
* `.dts` is a top-level Device Tree Source file.
* `.dtsi` is a include file for the `.dts`
* `.dtb` is the binary compiled device tree, this is what we are building here, and is supplied to the kernel at boot time.
## Building the MQ PRO device tree (`.dtb`)
By default the Device Tree compiler (`/usr/bin/dtc`) should already be installed in Ubuntu server, as should the linux-headers for the kernel.
## Compile the mq-pro dts with the current kernel headers
Example here is against the 'default' 6.8.0-31 linux kernel from the Ubuntu 24.04 release
* clean the `dtspp` folder: `rm dtspp/*`
* edit and run `bake.sh` to precompile the files against the latest linux-headers
* cd into the `dtspp` folder and run:
```dtc sun20i-d1-mangopi-mq-pro.dts > dtb-6.8.0-31-mqpro```
* cd into the `dtspp` folder and clean: `rm *.dts *.dtsi`
* run `preprocess.sh` to precompile the files in the parent folder against the latest linux-headers.
* still in the `dtspp` folder run:
```dtc sun20i-d1-mangopi-mq-pro.generic.dts > dtb-6.8.0-31-mqpro-generic.dtb```
modify the version to reflect the current headers
* move the `.dtb` file into the `/boot` folder:
`sudo mv dtb-6.8.0-31-mqpro /boot/dtbs`
* make a link in `/boot` to this:
`sudo ln -s dtbs/dtb-6.8.0-31-mqpro /boot/dtb-mqpro`
`sudo mv dtb-6.8.0-31-mqpro-generic /boot/dtbs`
* make a soft link in `/boot` to this:
`sudo ln -s dtbs/dtb-6.8.0-31-mqpro-generic.dtb /boot/dtb-mqpro`
### Set up Grub to test boot the new DTB
Initially we will test the new dtb:
@@ -44,13 +46,21 @@ Initially we will test the new dtb:
### Make this permanent in grub
ToDo
## Issues
**No HDMI output** - this is either a blocker.. or fine for a headless system
### Bonus
The onboard (blue) status LED can be controlled via the sys tree:
`sudo sh -c "echo 1 > /sys/devices/platform/leds/leds/blue\:status/brightness"` to turn on
`sudo sh -c "echo 1 > /sys/devices/platform/leds/leds/blue\:status/brightness"` to turn off
You can make it flash as wifi traffic is seen with:
`sudo sh -c "echo phy0rx > /sys/devices/platform/leds/leds/blue\:status/trigger"`
`sudo sh -c "echo 1 > /sys/devices/platform/leds/leds/blue\:status/brightness"` to turn on
`sudo sh -c "echo 0 > /sys/devices/platform/leds/leds/blue\:status/brightness"` to turn off
You can make it flash as wifi traffic is seen with:
`sudo sh -c "echo phy0rx > /sys/devices/platform/leds/leds/blue\:status/trigger"`
# references/links:
https://manpages.ubuntu.com/manpages/focal/man1/dtc.1.html
https://forum.armbian.com/topic/29626-mango-pi-mq-pro-d1-device-tree-try-to-okay-serial/
https://github.com/torvalds/linux/tree/master/arch/riscv/boot/dts/allwinner
https://github.com/ners/MangoPi/tree/d2589d8211a2f9ae57d88f2e2c4d6a449d668f9e/MangoPi/linux/arch/riscv/boot/dts/allwinner
DTS version that is used in the official armbian image?
https://github.com/smaeul/u-boot/tree/329e94f16ff84f9cf9341f8dfdff7af1b1e6ee9a/arch/riscv/dts