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xiaomi-lavender: new device (Xiaomi Redmi Note 7)

Administrator requested to merge xiaomi-lavender into master

This adds basic support for Xiaomi Redmi Note 7 and finishes some work that is stuck as WIP for too long already.

2 kernels variants are supported: downstream and mainline.

For downstream kernel:

Works:

  • flashing with fastboot, including vbmeta
  • kernel boots
  • ssh over USB
  • framebuffer (pmOS splash screens, wayland-based UIs)
  • weston works, and Xwayland is running
  • touchscreen
  • battery is charging

Does not work:

Mainline kernel it only at embryo stage. The main problem is that there is no sdm660 SoC in mainline kernel currently, only some individual drivers that were contributed by @opendata26. This continues opendata's work and serves as proof of concept that this is possible.

Works:

  • kernel boots
  • dmesg logs in pstore fs (you can read them from TWRP recovery)
  • dmesg logs over UART interface
  • all 8 CPUs are up!
  • simple-framebuffer can show logs of booting kernel on the screen because it uses hw initialized by bootloader
  • booting process successfully reaches postmarketOS's initramfs and it (obviously) can't find partitions because no block devices are present at all

Doesn't work:

  • everything else: no voltage regulators (PMIC) support => no USB, no sdhci, no gpu, ... no nothing

P.S. the following features were originally implemented to support this device:

P.P.S. funny note: nixOS-mobile lavender MR that uses patches from my branch was merged almost 4 months ago... so I took one patch from samuel too :)

Edited by Administrator

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