Follow-up Comment #2, bug #39861 (project grub):
My board has an NVDIMM, and BIOS reports the NVDIMM mapping as e820 type 12.
Stock Linux kernels treat unknown e820 types the same as reserved, and an
NVDIMM-enabled kernel will see type 12 memory and use the NVDIMM. Syslinux
passes type 12 straight through, but grub2 changes type 12 to type 2, breaking
the whole mechanism.
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