Incorporate patch 1899525

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@720 42af7a65-404d-4744-a932-0658087f49c3

arch/z80/src/Makefile

@@ -38,6 +38,7 @@
 
 -include $(TOPDIR)/Make.defs
 -include chip/Make.defs
+-include board/Make.defs
 
 ############################################################################
 # Compiler-Dependent Make

arch/z80/src/Makefile.sdcc

@@ -71,7 +71,7 @@ DEPSRCS		= $(CSRCS)
 ARCH_SRCDIR	= $(TOPDIR)/arch/$(CONFIG_ARCH)/src
 BOARDDIR	= $(TOPDIR)/arch/$(CONFIG_ARCH)/src/board
 
-VPATH		= chip:common
+VPATH		= chip:common:board
 
 # Libraries
 

arch/z80/src/z80/Make.defs

@@ -33,11 +33,13 @@
 #
 ############################################################################
 
+ifeq ($(CONFIG_ARCH_HAVEHEAD),)
 ifeq ($(CONFIG_LINKER_ROM_AT_0000),y)
 HEAD_ASRC	= z80_rom.asm
 else
 HEAD_ASRC	= z80_head.asm
 endif
+endif
 
 CMN_ASRCS	= 
 CMN_CSRCS	= up_initialize.c up_allocateheap.c up_createstack.c \

arch/z80/src/z80/README.txt

@@ -0,0 +1,49 @@
+arch/z80/src/z80
+^^^^^^^^^^^^^^^^
+
+The arch/z80 directories contain files to support a variety of 8-bit architectures
+from ZiLOG (and spin-architectures such as the Rabbit2000).  The arch/z80/src/z80
+sub-directory contains logic unique to the classic Z80 chip.
+
+Files in this directory include:
+
+z80_head.asm
+	This is the main entry point into the Z80 program.  This includes the
+	handler for the RESET, power-up interrupt vector and address zero and all
+	RST interrupts.
+
+z80_rom.asm
+	Some architectures may hae ROM located at address zero.  In this case, a
+	special version of the "head" logic must be used.  This specail "head"
+	file is probably board-specific and, hence, belongs in the board-specific
+	configs/<board-name>/src directory.  This file may, however, be used as
+	a model for such a board-specific file.
+
+	z80_rom.S is enabled by specifying CONFIG_LINKER_ROM_AT_0000 in the
+	configuration file.
+
+	A board specific version in the configs/<board-name>/src directory can be
+	used by:
+	
+	1. Define CONFIG_ARCH_HAVEHEAD
+	2. Add the board-specific head file, say <filename>.asm, to
+	   configs/<board-name>/src
+	3. Add a file called Make.defs in the configs/<board-name>/src directory
+	   containing the line:  HEAD_ASRC = <file-name>.asm
+
+Make.defs
+	This is the standard makefile fragment that must be provided in all
+	chip directories.  This fragment identifies the chip-specific file to
+	be used in building libarch.
+
+chip.h
+	This is the standard header file that must be provided in all chip
+	directories.
+
+z80_initialstate.c, z80_copystate.c,  z80_restoreusercontext.asm, and
+z80_saveusercontext.asm, switch
+ 	These files implement the Z80 context switching logic
+
+z80_schedulesigaction.c and  z80_sigdeliver.c
+	These files implement Z80 signal handling.
+ 

configs/xtrs/README.txt

@@ -1,12 +1,37 @@
 xtrs README
 ^^^^^^^^^^^^^
 
-TRS80 Model 3.  This port uses a vintage computer based on the Z80.
+Current status
+^^^^^^^^^^^^^^
+
+The xtrs port is not operational yet; some work still needs to be done.
+
+Getting a TRS80 emulator and DOS disks
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This port uses a vintage computer based on the Z80, the TRS80.
+There's a main page describing the different models of TRS80.
+See: http://www.trs-80.com
+
 An emulator for this computer is available to run TRS80 programs on a 
 linux platform (http://www.tim-mann.org/xtrs.html).
 
+Other emulators are available for other platforms. 
+See http://www.trs-80.com, click on the link Emulators.
+
+TRSDOS, LDOS and other softwares are available at:
+http://discover-net.net/~dmkeil/trs80/software/trs-dos.htm
+
+Or you can get TRSDOS 1.3 and 6.1 from this site; it's included with the emulator.
+http://discover-net.net/~dmkeil/trs80/model4.htm
+
 The SDCC toolchain is available from http://sdcc.sourceforge.net/.  All
-testing has been performed using version 2.6.0 of the SDCC toolchain.
+testing has been performed using version 2.7.0 of the SDCC toolchain.
+
+Loading an executable into xtrs
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+At http://www.trs-80.com click on the link: Getting a Software Onto an Emulator.
 
 Configuring NuttX
 ^^^^^^^^^^^^^^^^^

configs/xtrs/src/Make.defs

@@ -0,0 +1,37 @@
+############################################################################
+# configs/xtrs/src/Make.defs
+#
+#   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+HEAD_ASRC = xtrs_head.asm
+