topic How to add reserved-memory in dts on imx7? in i.MX Processors

How to add reserved-memory in dts on imx7?

ZhijianYe — Thu, 19 Nov 2020 02:13:16 GMT

Hi,

I want to add reserved-memory in dts on imx7. Would you show me?

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Thu, 19 Nov 2020 02:14:50 GMT

logo_mem@0xbe000000{
compatible = "logo_mem";
device_type = "memory";
reusable;
reg = <0xbe000000 0x02000000>;
status = "okay";
};

Is it right? How to make it right and work?

Re: How to add reserved-memory in dts on imx7?

joanxie — Thu, 19 Nov 2020 03:52:58 GMT

you need add reserved-memory for what? vpu or gpu?

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Fri, 20 Nov 2020 02:03:17 GMT

For saving a memory that is transmited from uboot to kernel. Will it work?

Re: How to add reserved-memory in dts on imx7?

joanxie — Fri, 20 Nov 2020 03:54:38 GMT

yes, if you need to change the memory for gpu, you can add "gpumem=xxx" in your uboot command, for more detailed information, pls refer to the document as below:

"https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Memory-Management-on-i-MX6-Android/ta-p/1102563"

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Fri, 20 Nov 2020 06:53:10 GMT

Thanks a lot.

And will the reserved-memory be initialized? I need it to keep the date that is written on uboot.

Re: How to add reserved-memory in dts on imx7?

joanxie — Fri, 20 Nov 2020 07:58:57 GMT

I don't know what you mean, uboot command just set the memory size

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Fri, 20 Nov 2020 08:05:04 GMT

I mean I will write data in the memory by coding, not command.Will the data be clean when uboot quit?

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Fri, 20 Nov 2020 08:15:56 GMT

I mean I will write data in the memory by coding during uboot working, not command.Will the data be clean when uboot quit?

Re: How to add reserved-memory in dts on imx7?

ZhijianYe — Fri, 20 Nov 2020 08:21:30 GMT

I mean I will write data in the memory by coding during uboot working, not command.Will the data be clean when uboot quit?

I think it will be clean. Is there any other way to save the data?