--- wikisrc/ports/evbarm.mdwn	2018/11/07 15:09:41	1.55
+++ wikisrc/ports/evbarm.mdwn	2018/11/11 16:37:42	1.56
@@ -23,20 +23,26 @@ Matt Thomas is the maintainer of NetBSD/
 ### CPU types
 
 The evbarm port can be built with a variety of CPU options.  There are
-three main variables: the instruction set, the endianness, and whether
-there is hardware floating point.  By default the CPU type is "earm",
-and this implies little endian (el when explicitly stated), and soft
+four main variables: the word size, the instruction set, the
+endianness, and whether there is hardware floating point.  By default
+the CPU type is "earm", and this implies aarch32 (32-bit), \todo cpu
+architecture, little endian (el when explicitly stated), and soft
 (emulated) floating point.  Another example, suitable for Raspberry PI
-2, is earmv7hf, which is the v7 instruction set, little endian,
-and hardware floating point.
+2, is earmv7hf, which is aarch32, the v7 instruction set, little
+endian, and hardware floating point.
 
 Typically, various boards are best compiled with a CPU type that
 matches the board's CPU and floating point support, but generally a
 lower CPU instruction set version is workable on a newer board.  See
 build.sh and look for aliases for the evbarm port.
 
-Some processors can operate as arm or the 64-bit ARM variant, aarch64, which is supported by
-[[NetBSD/aarch64|aarch64]].
+Through NetBSD 8, the evbarm port has supported exclusively the
+aarch32 (32-bit CPU) sub-family of the ARM architecture.  Some
+processors, such as many supporting the armv8 CPU architecture, also
+support a 64-bit instruction set, referred to as aarch64.  This is
+sometimes referred to as a distinct port, [[NetBSD/aarch64|aarch64]],
+with code in src/sys/arch/aarch64, but it is built as the evbarm port
+with aarch64 cpu type, and available as the alias evbarm64.
 
 ### Kernels and userland