Add DOS cross-compilation support to the Makefile

Add a README with build instructions.

Corresponding to flashrom svn r963.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Rudolf Marek <r.marek@assembler.cz>

Makefile

@@ -2,6 +2,7 @@
 # This file is part of the flashrom project.
 #
 # Copyright (C) 2005 coresystems GmbH <stepan@coresystems.de>
+# Copyright (C) 2009,2010 Carl-Daniel Hailfinger
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -20,15 +21,22 @@
 PROGRAM = flashrom
 
 CC      ?= gcc
-STRIP   = strip
+STRIP   ?= strip
 INSTALL = install
 DIFF    = diff
 PREFIX  ?= /usr/local
 MANDIR  ?= $(PREFIX)/share/man
-CFLAGS  ?= -Os -Wall -Werror -Wshadow
+CFLAGS  ?= -Os -Wall -Wshadow
 EXPORTDIR ?= .
 
-OS_ARCH	= $(shell uname)
+WARNERROR ?= yes
+
+ifeq ($(WARNERROR), yes)
+CFLAGS += -Werror
+endif
+
+# FIXME We have to differentiate between host and target arch.
+OS_ARCH	?= $(shell uname)
 ifneq ($(OS_ARCH), SunOS)
 STRIP_ARGS = -s
 endif
@@ -40,6 +48,12 @@ ifeq ($(OS_ARCH), FreeBSD)
 CPPFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 endif
+ifeq ($(OS_ARCH), DOS)
+CPPFLAGS += -I../libgetopt -I../libpci/include
+# Bus Pirate and Serprog are not supported under DOS.
+CONFIG_BUSPIRATESPI = no
+CONFIG_SERPROG = no
+endif
 
 CHIP_OBJS = jedec.o stm50flw0x0x.o w39v040c.o w39v080fa.o w29ee011.o \
 	sst28sf040.o m29f400bt.o 82802ab.o pm49fl00x.o \
@@ -188,12 +202,26 @@ endif
 endif
 
 ifeq ($(NEED_PCI), yes)
-LIBS += -lpci
+ifneq ($(OS_ARCH), DOS)
+# FIXME This workaround is needed until libpci detection can handle
+# cross-compiling for DOS.
+CHECK_LIBPCI = yes
+endif
+endif
+
+ifeq ($(NEED_PCI), yes)
 FEATURE_CFLAGS += -D'NEED_PCI=1'
 PROGRAMMER_OBJS += pcidev.o physmap.o hwaccess.o
 ifeq ($(OS_ARCH), NetBSD)
 LIBS += -lpciutils #		The libpci we want.
 LIBS += -l$(shell uname -p) #	For (i386|x86_64)_iopl(2).
+else
+ifeq ($(OS_ARCH), DOS)
+# FIXME There needs to be a better way to do this
+LIBS += ../libpci/lib/libpci.a ../libgetopt/libgetopt.a
+else
+LIBS += -lpci
+endif
 endif
 endif
 
@@ -239,7 +267,7 @@ compiler:
 		rm -f .test.c .test; exit 1)
 	@rm -f .test.c .test
 
-ifeq ($(NEED_PCI), yes)
+ifeq ($(CHECK_LIBPCI), yes)
 pciutils: compiler
 	@printf "Checking for libpci headers... "
 	@$(shell ( echo "#include <pci/pci.h>";		   \
@@ -315,6 +343,9 @@ tarball: export
 	@rm -rf $(EXPORTDIR)/flashrom-$(RELEASENAME)
 	@echo Created $(EXPORTDIR)/flashrom-$(RELEASENAME).tar.bz2
 
-.PHONY: all clean distclean dep compiler pciutils features export tarball
+djgpp-dos: clean
+	make CC=i586-pc-msdosdjgpp-gcc STRIP=i586-pc-msdosdjgpp-strip WARNERROR=no OS_ARCH=DOS
+
+.PHONY: all clean distclean dep compiler pciutils features export tarball dos
 
 -include .dependencies

README

@@ -42,7 +42,7 @@ Linux et al:
 
  * pciutils / libpci
  * pciutils-devel / pciutils-dev / libpci-dev
- * zlib-devel / zlib1g-dev (only needed if libpci is static)
+ * zlib-devel / zlib1g-dev (needed if libpci was compiled with libz support)
 
 On FreeBSD, you need the following ports:
 
@@ -75,6 +75,25 @@ To compile and run on Darwin/Mac OS X:
  Install DirectIO from coresystems GmbH.
  DirectIO is available at http://www.coresystems.de/en/directio.
 
+To cross-compile on Linux for DOS:
+
+ Get RPMs of the cross compiler from the DJGPP site and install them:
+ djcross-binutils-2.19.1-10ap.i386.rpm
+ djcross-gcc-tools-4.4.1-1ap.i686.rpm
+ djcross-gcc-4.3.2-8ap.i686.rpm
+ Download pciutils 3.1.5 and apply http://assembler.cz/flashrom/pciutils.patch
+ Download and compile http://assembler.cz/flashrom/libgetopt/
+ Compile pciutils, see README.DJGPP for instructions.
+ Enter the flashrom directory.
+ ../libpci should contain pciutils source and binaries.
+ ../libgetopt should contain getopt.a from libgetopt.
+ Run either (change settings where appropriate)
+ make CC=i586-pc-msdosdjgpp-gcc STRIP=i586-pc-msdosdjgpp-strip OS_ARCH=DOS
+ or (above settings hardcoded)
+ make djgpp-dos
+ You might have to add WARNERROR=no to the make command line.
+ To run flashrom.exe, download http://clio.rice.edu/djgpp/csdpmi7b.zip and
+ make sure CWSDPMI.EXE is in the current directory.
 
 Installation
 ------------