How to apply for large memory in user layer

[半醒的狐狸]

How do I request more than 400M memory at the user layer？

I tried malloc and mmap, malloc failed to return, mmap application was successful, but the kernel crashed during initialization。

my board is MCIMX7SABRE

thanks！！

[igorpadykov · Accepted solution]

Hi 益 李

one can try "reserved-memory" parameter

imx7d.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel 

https://www.kernel.org/doc/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt 

Best regards
igor
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[半醒的狐狸]

it's usefull ，i malloc 512M memory successfully，thanks。