dts - linux,usable-memory

[Laurentiu-Cristian Duca]

hello,

  my name is laurentiu-cristian duca and i am an open-source enthusiast.
lately i have tried to use the linux,usable-memory in the dts memory node
and linux freezes.
  if i use only reg, linux boots fine.
  does anybody used linux,usable-memory and can you show a working example.

  here is what i tried
        memory at 80000000 {
                device_type = "memory";
                reg = <0x0 0x80000000 0x0 0x700000>;
                //linux,usable-memory = <0x80000000 0x700000>;
        };

thank you,
laurentiu