diff --git a/stand/efi/loader/copy.c b/stand/efi/loader/copy.c
--- a/stand/efi/loader/copy.c
+++ b/stand/efi/loader/copy.c
@@ -296,6 +296,14 @@
 	return (res);
 }
 #define	EFI_ALLOC_METHOD	AllocateMaxAddress
+#elif defined(__aarch64__)
+/*
+ * Older kernels only support a 48-bit physical address space, and locore.S
+ * only supports a 50-bit space. Limit to 48 bits so older kernels can boot
+ * even if FEAT_LPA2 is supported by the hardware.
+ */
+#define	get_staging_max()	((1ul << 48) - 1)
+#define	EFI_ALLOC_METHOD	AllocateMaxAddress
 #else
 #define	EFI_ALLOC_METHOD	AllocateAnyPages
 #endif
@@ -320,7 +328,9 @@
 	 */
 	if (running_on_hyperv())
 		efi_verify_staging_size(&nr_pages);
+#endif
 
+#if EFI_ALLOC_METHOD == AllocateMaxAddress
 	staging = get_staging_max();
 #endif
 	status = BS->AllocatePages(EFI_ALLOC_METHOD, EfiLoaderCode,