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How to define reserved memory in device tree?

Question asked by Thinh Nguyen on Aug 23, 2018
Latest reply on Aug 23, 2018 by Thinh Nguyen

I am using iMX8MQ evk. I found that in file fsl-imx8mq-evk-m4.dts has some declaration for reserved memory that is used for Cortex M4.

 

reserved-memory {
   #address-cells = <2>;
   #size-cells = <2>;
   ranges;

   m4_reserved: m4@0x80000000 {
         no-map;
         reg = <0 0x80000000 0 0x1000000>;
   };

};

What does reg = <0 0x80000000 0 0x1000000> mean?

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