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+arch/x86/src/README.txt
+^^^^^^^^^^^^^^^^^^^^^^^
+
+This directory holds x86-specific source files.  All x86 source reside in
+lower-level common, chip-specific, and architecture-specific directories.
+
+common/ Directory
+^^^^^^^^^^^^^^^^^
+
+This directory holds source files common to all x86 architectures.
+
+Architecture-Specific Directories
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Architecture-specific directories hold common source files shared for by
+implementations of specific x86 architectures.
+
+i486
+  This directory holds logic appropriate for any instantiation of the 32-bit
+  i486 architecture.
+
+Chip-Specific directories
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The same x86 architecture may be realized in different chip implementations.
+For SoC chips, in particular, on-chip devices and differing interrupt
+structures may require special, chip-specific definitions in these chip-
+specific directories.
+
+qemu
+  This is the implementation of NuttX on the QEMU x86 simulation.