I use the extracted Android dtb file modify to work with linux kernel . You can use meson8b_m201d.dtb you posted, renamed to dtb.img . not the dtd .
Also you only reset once . If run LE reset for LE . if run Armbian reset once for ...
For me the process is device default logo then screen goes off and them on and all the linux start info.
Here is other kernel test it:
https://mega.nz/#!VSYF1aLI!OvuLNW1Lg1YH5S0UY33vCPyGaWs0Ac90D4m_t-V940g