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当你觉得迷茫的时候,那就多学习

rk3566 android CMA预留内存系统层获取ddr容量变小

reserved-memory {

  #address-cells = <2>;

  #size-cells = <2>;

  ranges;

   reserved: buffer@0 {

    compatible = "shared-dma-pool";

    reusable;

    reg = <0x0 0x70000000 0x0 0x10000000>;

    linux,cma-default; };

};

 

dts中配置了预留的memery

[ 0.000000] Reserved memory: created CMA memory pool at 0x0000000060000000, size 512 MiB
[ 0.000000] OF: reserved mem: initialized node rknpu, compatible id shared-dma-pool
[ 0.000000] Reserved memory: created CMA memory pool at 0x0000000010000000, size 8 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool

所以导致2G的DDR实际上只有1.3G

去掉后解决问题

posted @ 2022-01-06 18:48  陈昌雄  阅读(610)  评论(0编辑  收藏  举报
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