+# export to bootloader
+export ROMCONF=$(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).rom.conf
+
+# export to fpga-shells
+export FPGA_TOP_SYSTEM=$(MODEL)
+export FPGA_BUILD_DIR=$(BUILD_DIR)/$(FPGA_TOP_SYSTEM)
+export fpga_common_script_dir=$(FPGA_DIR)/common/tcl
+export fpga_board_script_dir=$(FPGA_DIR)/$(BOARD)/tcl
+
+export BUILD_DIR
+