2002-07-30 Joel Sherrill <joel@OARcorp.com>

	* BSP_TIMES, ChangeLog, Makefile.am, arm.texi, bsp.t, callconv.t,
	cpumodel.t, cputable.t, fatalerr.t, intr_NOTIMES.t, memmodel.t,
	preface.texi, stamp-vti, timeBSP.t, timing.texi, version.texi,
	wksheets.texi: New files as ARM supplement initial version added.

1 files changed, 38 insertions, 0 deletions

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+@c
+@c  COPYRIGHT (c) 1988-2002.
+@c  On-Line Applications Research Corporation (OAR).
+@c  All rights reserved.
+@c
+@c  $Id$
+@c
+
+@chapter Memory Model
+
+@section Introduction
+
+A processor may support any combination of memory
+models ranging from pure physical addressing to complex demand
+paged virtual memory systems.  RTEMS supports a flat memory
+model which ranges contiguously over the processor's allowable
+address space.  RTEMS does not support segmentation or virtual
+memory of any kind.  The appropriate memory model for RTEMS
+provided by the targeted processor and related characteristics
+of that model are described in this chapter.
+
+@section Flat Memory Model
+
+Members of the ARM family newer than Version 3 support a flat
+32-bit address space with addresses ranging from 0x00000000 to
+0xFFFFFFFF (4 gigabytes).  Each address is represented by a
+32-bit value and is byte addressable.  
+The address may be used to reference a
+single byte, word (2-bytes), or long word (4 bytes).  Memory
+accesses within this address space are performed in the endian
+mode that the processor is configured for.   In general, ARM
+processors are used in little endian mode.
+
+Some of the ARM family members such as the 
+920 and 720 include an MMU and thus support virtual memory and
+segmentation.  RTEMS does not support virtual memory or
+segmentation on any of the ARM family members.
+