Device Tree for Picasso seems broken

I don't know if it's my mess-up, but I was not able to build the exact same dtb image as found in the official boot.img. My built dtb image is 4.4M when concatenated while the official one is only ~800K, and most importantly, when packaged into boot.img, the one built by me does not work and fails straight into bootloader. In console-ramoops I can't even see kernel messages during such a crash, which probably means the kernel isn't even booted enough to output anything to ramoops. I tried to unpack the concatenated dtb images and compare them one-by-one, but it seemed to me that even the same dtb in the two images do not really match up and differs quite significantly.

In my current effort to port LineageOS 17.1 to this device, I resorted to using OSS kernel + prebuilt DTB / DTBO for now. I hope that this can be sorted out soon as some of my kernel changes had to be dirty hacks without functional OSS DTB / DTBO.

Of course, since I'm not aware of anyone else that is currently trying to build kernel + dt for this device, it could be totally my fault instead of Xiaomi's. But for now since I do not know, I'm keeping this open until someone fixed it or could help figure out why mine does not work. My forked kernel source code (with dt included) is at https://github.com/PeterCxy/android_kernel_xiaomi_sm7250

Bắt đầu với mã nguồn kernel đã fork và các tệp device-tree được liên kết trong issue, sau đó so sánh đầu ra DTB được nối của nó với boot.img chính thức và DTB/DTBO dựng sẵn. Kiểm tra các khác biệt trong việc đóng gói và đầu ra ramoops trong quá trình khởi động. Được xem là hoàn tất khi xác định được nguyên nhân và tạo ra một DTB/DTBO có thể được đóng gói vào boot.img và khởi động Picasso thành công.