Device Boot Loop Issue While Porting to Ubuntu Touch (Halium 13)
I am trying to port my device to Ubuntu Touch, using Halium 13. I have flashed the images to the right partitions, but I encountered a boot loop with the following behavior:
Boot Loop Sequence
The device shows the Motorola start-up logo for one second.
The device shows the unlocked bootloader warning screen for 6 seconds.
It shows the Motorola logo again for 6 to 10 seconds, but now with a horizontal pixelated line on the screen.
It then shows a blank screen for 5 to 10 seconds.
The cycle repeats, but the line gradually moves down on each reboot.
Troubleshooting Performed
At this stage, I entered the fastboot bootloader and tried:
fastboot boot twrp.img
However, the device immediately started boot looping.
I then replaced dtbo.img with the one from the latest LineageOS 20 build available for my device.
After this change, the horizontal line disappeared.
I was able to successfully boot TWRP using:
fastboot boot twrp.img
Logging Investigation
I attempted to read the pstore logs but couldn't find any useful output.
I suspected the kernel might not have been built with the required logging options enabled.
To address this, I:
Created a separate logging.config file with the right kernel flags.
Added it to deviceinfo.
Verified that the options were correctly applied to the generated .config file located at:
workdir/downloads/KERNELOBJ
Added the appropriate kernel command-line parameters to the vendor cmdline in the deviceinfo file.
Current Status
Despite these changes:
The device still does not boot properly.
USB does not become available.
The pstore directory remains empty even after enabling all relevant logging flags and kernel parameters.
Source Tree
For debugging and error analysis, the device source tree is available at:
https://gitlab.com/systemmaniac2010/motorola-rhode
Please help me out with this.
