mkproject: add support for platform variants

This commit adds basic support for platform variants. The script does
not make any sanity check on the variant name. It's user's
responsibility to use the correct variant for the platform.

https://jira.digi.com/browse/DEL-435

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

sdk/mkproject.sh

@@ -35,9 +35,14 @@ Usage: source ${SCRIPTNAME} [OPTIONS]
 
     -l               list available platforms
     -p <platform>    select platform for the project
+    -v <variant>     select platform variant
 
 Available platforms: ${AVAILABLE_PLATFORMS}
 
+See platform include files for supported variant names:
+
+${SCRIPTPATH}/sources/meta-digi/meta-digi-arm/conf/machine/include/<platform>.inc
+
 EOF
 }
 
@@ -72,6 +77,10 @@ do_mkproject() {
 		sed -i  -e "/^#BB_NUMBER_THREADS =/cBB_NUMBER_THREADS = \"${NCPU}\"" \
 			-e "/^#PARALLEL_MAKE =/cPARALLEL_MAKE = \"-j ${NCPU}\"" \
 			${PROJECTPATH}/conf/local.conf
+		if [ -n "${variant}" ]; then
+			sed -i -e "/^MACHINE_VARIANT =/cMACHINE_VARIANT = \"${variant}\"" \
+				${PROJECTPATH}/conf/local.conf
+		fi
 		unset NCPU
 	fi
 }
@@ -94,10 +103,11 @@ AVAILABLE_PLATFORMS="$(echo $(ls -1 ${CONFIGPATH}/*/local.conf.sample | sed -e '
 # The script needs to be sourced (not executed) so make sure to
 # initialize OPTIND variable for getopts.
 OPTIND=1
-while getopts "lp:" c; do
+while getopts "lp:v:" c; do
 	case "${c}" in
 		l) list_platforms="y";;
 		p) platform="${OPTARG}";;
+		v) variant="${OPTARG}";;
 	esac
 done
 
@@ -118,4 +128,4 @@ fi
 
 # clean-up all variables (so the script can be re-sourced)
 unset AVAILABLE_PLATFORMS GREEN NONE OLD_PROJECT PROJECTPATH RED SCRIPTNAME SCRIPTPATH
-unset list_platforms platform
+unset list_platforms platform variant