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Some add_efi_memmep documentation already consulted:

Without the add_efi_memmap boot argument:

With add_efi_memmap the EFI memory map size differs:

EFI stub boot without add_efi_memmap:

EFI stub boot with add_efi_memmap:

GRUB boot without the add_efi_memmap boot argument:

GRUB boot with add_efi_memmap and the EFI memory map size does seem to differ:

EFI stub boot without add_efi_memmap:

EFI stub boot with add_efi_memmap:

After reading more information - as inlined below - I can't figure out whether to add add_efi_memmap or not. It does something extra which doesn't seem absolutely necessary to boot. On the other hand it can give to give a better (more complete) view of usable memory.

EFI stub boot without add_efi_memmap:

• 22 BIOS-e820 lines
• 60 EFI memory lines
• DMA zone: 21 pages reserved
• Memory: 7885012K/8283384K available

EFI stub boot with add_efi_memmap:

• 22 BIOS-e820 lines
• 66 EFI memory lines
• DMA zone: 21 pages reserved
• Memory: 7882124K/8283384K available

After reading more information - as inlined below - I can't figure out whether to add add_efi_memmap or not. It does something extra which doesn't seem absolutely necessary to boot. On the other hand it can give to give a better (more complete) view of usable memory.