This was deprecated in 2001 and announced to live on for 5 years.
Some old boot loaders still use this way.
+config XEN_DOM0
+ def_bool y
+ depends on XEN
+
+config XEN
+ bool "Xen guest support on ARM (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && ARM && OF
+ help
+ Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
+
endmenu
menu "Boot options"