uefi.8: describe architecture-specific default path

Sponsored by:	The FreeBSD Foundation

share/man/man8/uefi.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 24, 2018
+.Dd January 25, 2018
 .Dt UEFI 8
 .Os
 .Sh NAME
@@ -65,16 +65,20 @@ boot process proceeds as follows:
 firmware runs at power up and searches for an OS loader in the EFI system
 partition.
 The path to the loader may be set by an EFI environment variable.
-If not set, the default is
-.Pa /EFI/BOOT/BOOTX64.EFI .
+If not set, an architecture-specific default is used.
+.Bl -column -offset indent "Architecture" "Default Path"
+.It Sy Architecture Ta Sy Default Path
+.It amd64 Ta Pa /EFI/BOOT/BOOTX64.EFI
+.It arm64 Ta Pa /EFI/BOOT/BOOTAA64.EFI
+.El
+.Pp
 The default
 .Nm
 boot configuration for
 .Fx
 installs
 .Pa boot1.efi
-as
-.Pa /EFI/BOOT/BOOTX64.EFI .
+in the default path.
 .It
 .Pa boot1.efi
 reads boot configuration from