Thanks Randy. Good info though I didn't find the a solution there.
But through the cxl developer community I have found a solution, and I'll
share it here for posterity.
sudo grub2-editenv /boot/grub2/grubenv set memmap_val='8G\$8G'
GRUB_CMDLINE_LINUX=" ... memmap=\$memmap_val"
Cheers,
Joh
On Thu, Dec 21, 2023 at 11:06 PM Randy Goldenberg <
randy.goldenb...@gmail.com> wrote:
> "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
>
>
