Today, 03:11 AM
Thanks to the great series of educational tutorials from @lupyuen , and following the same reverse engineering journey, I finally managed to boot my PinePhone as far as LCD and drawing to screen last night 
No Linux, just Zig! and a bit of assembly for boot header. The code is a disaster scene, but buying a 3rd party serial debug cable this week was the final key to fixing the many register value typos I had scattered throughout my code. It is a shame with the tariffs into EU, because I should have also bought an SD card extender, the number of times I have to switch the SD card between tests is crazy!
If anyone else takes this journey, I highly recommend to buy the serial debug cable first!! I dont know how I managed without for so long, flashing LEDs to monitor progress hehe.
Anyway, I just wanted to post here to thank the community, what is left of it
but especially thanks to Lupyuen for the huge amount of work he has spent on adding the missing documentation to get these devices working as part of his NuttX work. Well done!
No Linux, just Zig! and a bit of assembly for boot header. The code is a disaster scene, but buying a 3rd party serial debug cable this week was the final key to fixing the many register value typos I had scattered throughout my code. It is a shame with the tariffs into EU, because I should have also bought an SD card extender, the number of times I have to switch the SD card between tests is crazy!If anyone else takes this journey, I highly recommend to buy the serial debug cable first!! I dont know how I managed without for so long, flashing LEDs to monitor progress hehe.
Anyway, I just wanted to post here to thank the community, what is left of it
but especially thanks to Lupyuen for the huge amount of work he has spent on adding the missing documentation to get these devices working as part of his NuttX work. Well done!