imx8x reserved-memory

songhongliang — Tue, 14 Mar 2023 03:12:25 GMT

I set the reserved memory in the dts. I only reserved dozens of megabytes of memory, but the kernel log shows that more than 200 megabytes of memory are reserved, imx8x. Is there any other place besides the dts set the reserved memory

log:

[ 0.000000] Memory: 492256K/1046528K available (18560K kernel code, 1558K rwdata, 7180K rodata, 3840K init, 544K bss, 226592K reserved, 327680K cma-reserved)

dtb->dts:

reserved-memory {
#address-cells = <0x02>;
#size-cells = <0x02>;
ranges;

decoder-boot@0x84000000 {
reg = <0x00 0x84000000 0x00 0x2000000>;
no-map;
phandle = <0x40>;
};

encoder-boot@0x86000000 {
reg = <0x00 0x86000000 0x00 0x200000>;
no-map;
phandle = <0x43>;
};

decoder-rpc@0x86200000 {
reg = <0x00 0x86200000 0x00 0x100000>;
no-map;
phandle = <0x41>;
};

encoder-rpc@0x94400000 {
reg = <0x00 0x94400000 0x00 0x700000>;
no-map;
phandle = <0x44>;
};

linux,cma {
compatible = "shared-dma-pool";
reusable;
size = <0x00 0x14000000>;
alloc-ranges = <0x00 0x98000000 0x00 0x14000000>;
linux,cma-default;
};
};

Re: imx8x reserved-memory

Sanket_Parekh — Fri, 17 Mar 2023 09:41:54 GMT

Hi @songhongliang

I hope you are doing well.

Please refer to Chapter 7 Memory Assignment and Table 1. DDR memory assignment in i.MX Porting Guide, where DRAM memory regions are reserved for ATF, SCFW, etc...

One can also try to debug with the below sysfs directory to cross-check if any overlay is not applied to device tree.

$ cd sys/firmware/devicetree/base/reserved-memory/

$ ls

Thanks & Regards,

Sanket Parekh

i.MX Processorsのトピックimx8x reserved-memory

imx8x reserved-memory

Re: imx8x reserved-memory