diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 58eb696ccf13ea982fcce400e16bfea6252ac82d..886c900323f145d05913c300c4309dcfac6dd4de 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1944,7 +1944,7 @@
 
 	keepinitrd	[HW,ARM]
 
-	kernelcore=	[KNL,X86,IA-64,PPC]
+	kernelcore=	[KNL,X86,IA-64,PPC,ARM64]
 			Format: nn[KMGTPE] | nn% | "mirror"
 			This parameter specifies the amount of memory usable by
 			the kernel for non-movable allocations.  The requested
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 8eb44aec2c78e18082d501e56e66d97ae1184389..a3b3bfccd822160afdad5500283ec69b01fd3c40 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -724,8 +724,10 @@ void __init arm64_memblock_init(void)
 	else
 		arm64_dma_phys_limit = PHYS_MASK + 1;
 
-	if (efi_enabled(EFI_MEMMAP))
+	if (efi_enabled(EFI_MEMMAP)) {
 		efi_fake_memmap();
+		efi_find_mirror();
+	}
 
 	reserve_pin_memory_res();