Device tree for Xiaomi 14T (degas)

LineageOS device tree for the Xiaomi 14T, codename degas (MediaTek Dimensity 8300-Ultra, MT6897).

Basic	Spec sheet
SoC	MediaTek Dimensity 8300-Ultra (MT6897)
GPU	Mali-G615 MC6
Display	6.67" AMOLED, 1220x2712, 144 Hz
Android	LineageOS 23 (based on stock Android 16, OS3.0.4.0.WNEMIXM)

Building

Add degas.xml to .repo/local_manifests/ of a LineageOS 23.2 checkout and sync:

mkdir -p .repo/local_manifests
cp device/xiaomi/degas/degas.xml .repo/local_manifests/
repo sync
source build/envsetup.sh
breakfast degas userdebug
mka bacon

Read the comments in that manifest before editing it. Several of the projects it looks like it needs are already declared by the LineageOS base manifest, and re-declaring them makes repo sync abort with duplicate path.

Three other repositories are involved:

Repository	What for
android_device_xiaomi_degas-kernel	prebuilt GKI kernel, modules and base device tree
android_external_wpa_supplicant_8	one commit for WPA3/SAE on the MediaTek gen4m driver
android_vendor_xiaomi_degas	proprietary blobs, not published — see below

Vendor blobs

There is no published vendor tree. Generate it from your own device, which is what extract-files.py is for:

./extract-files.py <path to an extracted stock firmware dump>
./extract-files.py            # no argument: pull from a connected device over adb

Use the stock build this tree targets, OS3.0.4.0.WNEMIXM — another build can ship different blobs and different sonames.

After every extraction run ./verify-hand-edits.py. One blob carries a hand edit that a re-extract silently reverts, and the script fails loudly when that happens.

Don't run --regenerate_makefiles; it discards checked-in edits.

Credits

Based on the duchamp device tree by mt6897-devs, same MT6897 platform. The git history is preserved: commits inherited from duchamp are prefixed duchamp: and keep their original authors.

License

Apache License, Version 2.0.

Some of the tree isn't covered by it — the GPL-2.0 kernel UAPI header in udfps/, and the configuration extracted from Xiaomi stock firmware. NOTICE has the full list, the attribution Apache-2.0 section 4 requires, and the record of what was changed from the upstream tree.