Add support for a saving build objects in a separate directory.

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

CHANGELOG

@@ -2,6 +2,26 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Add support for a saving build objects in a separate directory.
+  Modifications are based on the linux kernel approach and 
+  support two use cases:
+
+  1) Add O= to the make command line
+  'make O=/tmp/build all'
+
+  2) Set environement variable BUILD_DIR to point to the desired location
+  'export BUILD_DIR=/tmp/build'
+  'make'
+
+  The second approach can also be used with a MAKEALL script
+  'export BUILD_DIR=/tmp/build'
+  './MAKEALL'
+
+  Command line 'O=' setting overrides BUILD_DIR environent variable.
+
+  When none of the above methods is used the local build is performed and
+  the object files are placed in the source directory.
+
 * Remove the board/netstar/crcit binary from git repository.
 
 * Fix tools/updater build error.

MAKEALL

@@ -8,7 +8,17 @@ else
 	MAKE=make
 fi
 
-[ -d LOG ] || mkdir LOG || exit 1
+if [ "${MAKEALL_LOGDIR}" ] ; then
+	LOG_DIR=${MAKEALL_LOGDIR}
+else
+	LOG_DIR="LOG"
+fi
+
+if [ ! "${BUILD_DIR}" ] ; then
+	BUILD_DIR="."
+fi
+
+[ -d ${MAKEALL_LOGDIR} ] || mkdir ${MAKEALL_LOGDIR} || exit 1
 
 LIST=""
 
@@ -303,8 +313,12 @@ build_target() {
 
 	${MAKE} distclean >/dev/null
 	${MAKE} ${target}_config
-	${MAKE} ${JOBS} all 2>&1 >LOG/$target.MAKELOG | tee LOG/$target.ERR
-	${CROSS_COMPILE:-ppc_8xx-}size u-boot | tee -a LOG/$target.MAKELOG
+
+	${MAKE} ${JOBS} all 2>&1 >${LOG_DIR}/$target.MAKELOG \
+				| tee ${LOG_DIR}/$target.ERR
+
+	${CROSS_COMPILE:-ppc_8xx-}size ${BUILD_DIR}/u-boot \
+				| tee -a ${LOG_DIR}/$target.MAKELOG
 }
 
 #-----------------------------------------------------------------------