What works:
* Flashing with heimdall and a SD card
* Networking over USB
* SSH over USB
* Splash screen (when booting from charging screen)
What doesn't work:
* Any other UI than "none" (they boot, but no graphics and no SSH)
Steps to flash:
* pmbootstrap init # Select samsung-loganrelte, select "none" as UI
* pmbootstrap build linux-samsung-loganrelte
* pmbootstrap build device-samsung-loganrelte
* pmbootstrap install --sdcard=/dev/sdX # doesn't boot from internal storage
* pmbootstrap flasher flash_kernel