Thank you for helping me.
I don't see `/dev/-cma`. Also I don't see cma in module.
But I see CmaTotal and CmaTree in `/proc/meminfo`.
```text
# ls /dev/
autofs gpiochip0 mmcblk0 ptyp0 ptypc tty0
tty2 tty30 tty41 tty52 tty63 ttyp6vcs1 vcsa6
block
I ran into the same problem. I tried to enable CMA by compiling Linux kernel
but I couldn't get it.
I tried [this
instruction](https://www.digikey.com/eewiki/display/linuxonarm/DE10-Nano+Kit#DE10NanoKit-LinuxKernel)
and I enabled CMA in the kernel config. Then I booted with the kernel but
`/
