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xiaomi-cepheus: new device (Xiaomi Mi 9)

Administrator requested to merge cepheus into master

Powerful beast with Snapdragon 855 - 8 cores up to 2.8 GHz, 6 Gb RAM and fast UFS storage.

Downstream kernel will not be maintained really, but useful for exploring stuff. That kernel is at version 4.14 and can be compiled with recent gcc versions though, so not that bad.

USB rndis works, touch too, but no display (framebuffer, /dev/fb0 is not present at all). Internal storage works, battery/charging.

Mainline port is bare minimum (UART, framebuffer display, GPIO keys, USB). No storage support yet (UFS doesn't work)

https://wiki.postmarketos.org/wiki/Xiaomi_Mi_9_(xiaomi-cepheus)

Edited by Administrator

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