Hello, check do you have /dev/-cma

![image|633x289](upload://5mgEGeTSHkHqMj4zWheuWuqujEh.png) 

Also you could check cma module installed:
$ lsmod | grep cma
cma                    16384  0
To check available volume of cma:
$ cat /proc/meminfo

![image|254x500](upload://mZVNiX9gO5ARi1ULFUfnI8uiPyc.png)





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