From 07b3693f175a0a601a53cba656940aaec8bd9949 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Fri, 28 Aug 1998 13:21:53 +0000
Subject: Base files

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 doc/bsp_howto/makefiles.t | 142 ++++++++++++++++++++++++++++++++++++++++++++++
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+@chapter = The Makefiles
+
+@subsection = Makefiles Used During The BSP Building Process
+
+There's a makefile template in each directory of a BSP. They are called
+"makefile.in" and are processed when building RTEMS for a given BSP. One
+should specify the needed files and directories before the building
+process. 
+
+@itemize @bullet
+
+@item the makefile.in at the BSP root specifies which folders have to be
+included. For instance,
+
+@item We only build the ka9q device driver if HAS_KA9Q was defined
+
+@example
+KA9Q_DRIVER_yes_V = network
+KA9Q_DRIVER = $(KA9Q_DRIVER_$(HAS_KA9Q)_V) 
+
+[...]
+
+SUB_DIRS=include start340 startup clock console timer $(KA9Q_DRIVER) wrapup
+@end example
+
+states that all the directories have to be processed, except for the
+network directory which is included only if the user asked for it when
+building RTEMS. 
+
+@item the makefile.in in each driver directory. It lists the files to be
+included in the driver, so don't forget to add the reference to a new file
+in the makefile.in of a given driver when it is created! 
+
+@end itemize
+
+
+Rem : the makefile.in files are ONLY processed during the configure
+process of a RTEMS build. It means that, when you're working on the design
+of your BSP, and that you're adding a file to a folder and to the
+corresponding makefile.in, it will not be take n into account! You have to
+run configure again or modify the makefile (result of the makefile.in
+process, usually in your <the RTEMS build
+directory>/c/src/lib/libbsp/<your BSP family>/<your BSP>/<your driver>
+directory) by hand. 
+
+@subsection = Makefiles Used Both During The BSP Design and its Use
+
+A BSP must go with his configuration file. The configuration files can be
+found under $RTEMS_ROOT/c/make/custom. The configuration file is taken
+into account when building one's application using the template makefiles
+($RTEMS_ROOT/c/make/templates), whic h is strongly advised. There are
+templates for calling recursively the makefiles in the directories beneath
+the current one, building a library or an executable.
+
+Let's see what it looks like :
+
+@example
+RTEMS_CPU=m68k
+
+TARGET_ARCH=o-gen68340
+RTEMS_CPU_MODEL=mcpu32
+
+include $(RTEMS_ROOT)/make/custom/default.cfg
+
+RTEMS_BSP_FAMILY=gen68340
+
+## Target compiler config file, if any
+CONFIG.$(TARGET_ARCH).CC = $(RTEMS_ROOT)/make/compilers/gcc-target-default.cfg
+
+RTEMS_BSP=gen68340
+
+CPU_CFLAGS = -mcpu32
+
+# optimize flag: 
+CFLAGS_OPTIMIZE_V=-O4 -fomit-frame-pointer
+
+# Override default start file
+START_BASE=start340
+
+[...]
+
+ifeq ($(RTEMS_USE_GCC272),yes)
+[...]
+else
+
+define make-exe
+	$(CC) $(CFLAGS) $(CFLAGS_LD) -o $(basename $@).exe $(LINK_OBJS)
+	$(NM) -g -n $(basename $@).exe > $(basename $@).num
+	$(SIZE) $(basename $@).exe
+endif
+@end example
+
+the main board CPU family
+
+directory where you want the objects to go
+
+the main board CPU name for GCC
+
+include standard definitions
+
+bsp directory used during the build process 
+
+cross-compiler options
+
+
+
+
+the name of your bsp directory
+
+CPU flag to pass to GCC
+
+optimisation flag to pass to GCC
+
+
+name of your BSP function to be called immediately after reboot
+
+
+
+if an older version of GCC is used...
+
+
+
+this macro is used in template makefiles to build the final executable.
+Any other commands to follow, just as using objcopy to build a PROM image
+or converting the executable to binary. 
+
+Figure 1 : custom file for gen68340 BSP ($RTEMS_ROOT/make/custom/gen68340.cfg)
+
+
+
+What you have to do:
+
+@itemize @bullet
+
+@item copy any .cfg file to <your BSP>.cfg
+
+@item modify RTEMS_CPU, TARGET_ARCH, RTEMS_CPU_MODEL, RTEMS_BSP_FAMILY,
+RTEMS_BSP, CPU_CFLAGS, START_BASE accordingly. 
+
+@end itemize
+
+
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