Makefile/mkconfig: read simple board configurations from boards.cfg

Instead of adding explicit build rules for each and every board to the
top level Makefile (which makes it grow and grow), we now provide a
simple default rule and extend the "mkconfig" script to read board
configurations from a plain text file (table), "boards.cfg".

For simple boards it is now sufficient to add a single line of text to
the "boards.cfg" file, no changes to the top level Makefile are needed
any more.

To make the table better readable, change the notation for unused
fields from "NULL" into "-".

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Mike Frysinger <vapier@gentoo.org>

1 files changed, 51 insertions, 21 deletions

diff --git a/mkconfig b/mkconfig
index a71d09e..b661071 100755
--- a/mkconfig
+++ b/mkconfig
@@ -12,6 +12,24 @@ APPEND=no	# Default: Create new config file
 BOARD_NAME=""	# Name to print in make output
 TARGETS=""
 
+arch=""
+cpu=""
+board=""
+vendor=""
+soc=""
+
+if [ \( $# -eq 2 \) -a \( "$1" = "-A" \) ] ; then
+	# Automatic mode
+	line=`egrep -i "^[[:space:]]*${2}[[:space:]]" boards.cfg` || {
+		echo "make: *** No rule to make target \`$2_config'.  Stop." >&2
+		exit 1
+	}
+
+	set ${line}
+	# add default board name if needed
+	[ $# = 3 ] && set ${line} ${1}
+fi
+
 while [ $# -gt 0 ] ; do
 	case "$1" in
 	--) shift ; break ;;
@@ -22,13 +40,25 @@ while [ $# -gt 0 ] ; do
 	esac
 done
 
-[ "${BOARD_NAME}" ] || BOARD_NAME="${1%_config}"
-
 [ $# -lt 4 ] && exit 1
 [ $# -gt 6 ] && exit 1
 
-if [ "${ARCH}" -a "${ARCH}" != "$2" ]; then
-	echo "Failed: \$ARCH=${ARCH}, should be '$2' for ${BOARD_NAME}" 1>&2
+CONFIG_NAME="${1%_config}"
+
+[ "${BOARD_NAME}" ] || BOARD_NAME="${CONFIG_NAME}"
+
+arch="$2"
+cpu="$3"
+if [ "$4" = "-" ] ; then
+	board=${BOARD_NAME}
+else
+	board="$4"
+fi
+[ $# -gt 4 ] && [ "$5" != "-" ] && vendor="$5"
+[ $# -gt 5 ] && [ "$6" != "-" ] && soc="$6"
+
+if [ "${ARCH}" -a "${ARCH}" != "${arch}" ]; then
+	echo "Failed: \$ARCH=${ARCH}, should be '${arch}' for ${BOARD_NAME}" 1>&2
 	exit 1
 fi
 
@@ -42,26 +72,26 @@ if [ "$SRCTREE" != "$OBJTREE" ] ; then
 	mkdir -p ${OBJTREE}/include2
 	cd ${OBJTREE}/include2
 	rm -f asm
-	ln -s ${SRCTREE}/arch/$2/include/asm asm
-	LNPREFIX=${SRCTREE}/arch/$2/include/asm/
+	ln -s ${SRCTREE}/arch/${arch}/include/asm asm
+	LNPREFIX=${SRCTREE}/arch/${arch}/include/asm/
 	cd ../include
 	rm -f asm
-	ln -s ${SRCTREE}/arch/$2/include/asm asm
+	ln -s ${SRCTREE}/arch/${arch}/include/asm asm
 else
 	cd ./include
 	rm -f asm
-	ln -s ../arch/$2/include/asm asm
+	ln -s ../arch/${arch}/include/asm asm
 fi
 
 rm -f asm/arch
 
-if [ -z "$6" -o "$6" = "NULL" ] ; then
-	ln -s ${LNPREFIX}arch-$3 asm/arch
+if [ -z "${soc}" ] ; then
+	ln -s ${LNPREFIX}arch-${cpu} asm/arch
 else
-	ln -s ${LNPREFIX}arch-$6 asm/arch
+	ln -s ${LNPREFIX}arch-${soc} asm/arch
 fi
 
-if [ "$2" = "arm" ] ; then
+if [ "${arch}" = "arm" ] ; then
 	rm -f asm/proc
 	ln -s ${LNPREFIX}proc-armv asm/proc
 fi
@@ -69,19 +99,19 @@ fi
 #
 # Create include file for Make
 #
-echo "ARCH   = $2" >  config.mk
-echo "CPU    = $3" >> config.mk
-echo "BOARD  = $4" >> config.mk
+echo "ARCH   = ${arch}"  >  config.mk
+echo "CPU    = ${cpu}"   >> config.mk
+echo "BOARD  = ${board}" >> config.mk
 
-[ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk
+[ "${vendor}" ] && echo "VENDOR = ${vendor}" >> config.mk
 
-[ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk
+[ "${soc}"    ] && echo "SOC    = ${soc}"    >> config.mk
 
 # Assign board directory to BOARDIR variable
-if [ -z "$5" -o "$5" = "NULL" ] ; then
-    BOARDDIR=$4
+if [ -z "${vendor}" ] ; then
+    BOARDDIR=${board}
 else
-    BOARDDIR=$5/$4
+    BOARDDIR=${vendor}/${board}
 fi
 
 #
@@ -102,7 +132,7 @@ done
 cat << EOF >> config.h
 #define CONFIG_BOARDDIR board/$BOARDDIR
 #include <config_defaults.h>
-#include <configs/${BOARDNAME}.h>
+#include <configs/${CONFIG_NAME}.h>
 #include <asm/config.h>
 EOF