"memmap=nn[KMG]$ss[KMG]
[KNL,ACPI] Mark specific memory as reserved.
Region of memory to be reserved is from ss to ss+nn.
Example: Exclude memory from 0x18690000-0x1869ffff
memmap=64K$0x18690000
or
memmap=0x10000$0x18690000
Some bootloaders may need an escape character before
'$',
like Grub2, otherwise '$' and the following number
will be eaten."
https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt
"Changing GRUB menu entries and kernel arguments vary between Linux
distributions and versions of the same distro. Instructions for some
of the common Linux distros can be found below. Refer to the
documentation of the Linux distro and version being used for more
information."
https://docs.pmem.io/persistent-memory/getting-started-guide/creating-development-environments/linux-environments/linux-memmap
