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#############################################################
# Makefile Arguments
#############################################################
# BSP_DIR sets the path to the target-specific board support package.
BSP_DIR ?= $(abspath bsp)
# SRC_DIR sets the path to the program source directory
SRC_DIR ?= $(abspath src)
#############################################################
# BSP loading
#############################################################
# There must be a settings makefile fragment in the BSP's board directory.
ifeq ($(wildcard $(BSP_DIR)/settings.mk),)
$(error Unable to find BSP for $(TARGET), expected to find $(BSP_DIR)/settings.mk)
endif
# Include the BSP settings
include $(BSP_DIR)/settings.mk
# Check that settings.mk sets RISCV_ARCH and RISCV_ABI
ifeq ($(RISCV_ARCH),)
$(error $(BSP_DIR)/board.mk must set RISCV_ARCH, the RISC-V ISA string to target)
endif
ifeq ($(RISCV_ABI),)
$(error $(BSP_DIR)/board.mk must set RISCV_ABI, the ABI to target)
endif
# Determines the XLEN from the toolchain tuple
ifeq ($(patsubst rv32%,rv32,$(RISCV_ARCH)),rv32)
RISCV_XLEN := 32
else ifeq ($(patsubst rv64%,rv64,$(RISCV_ARCH)),rv64)
RISCV_XLEN := 64
else
$(error Unable to determine XLEN from $(RISCV_ARCH))
endif
#############################################################
# Toolchain
#############################################################
# Allow users to select a different cross compiler.
CROSS_COMPILE ?= riscv64-unknown-elf
# If users don't specify RISCV_PATH then assume that the tools will just be in
# their path.
ifeq ($(RISCV_PATH),)
RISCV_GCC := $(CROSS_COMPILE)-gcc
RISCV_GXX := $(CROSS_COMPILE)-g++
RISCV_OBJDUMP := $(CROSS_COMPILE)-objdump
RISCV_GDB := $(CROSS_COMPILE)-gdb
RISCV_AR := $(CROSS_COMPILE)-ar
else
RISCV_GCC := $(abspath $(RISCV_PATH)/bin/$(CROSS_COMPILE)-gcc)
RISCV_GXX := $(abspath $(RISCV_PATH)/bin/$(CROSS_COMPILE)-g++)
RISCV_OBJDUMP := $(abspath $(RISCV_PATH)/bin/$(CROSS_COMPILE)-objdump)
RISCV_GDB := $(abspath $(RISCV_PATH)/bin/$(CROSS_COMPILE)-gdb)
RISCV_AR := $(abspath $(RISCV_PATH)/bin/$(CROSS_COMPILE)-ar)
PATH := $(abspath $(RISCV_PATH)/bin):$(PATH)
endif
#############################################################
# Software
#############################################################
ifneq ($(BSP),legacy)
PROGRAM_ELF ?= $(SRC_DIR)/$(PROGRAM)
.PHONY: all
all: software
.PHONY: software
software: $(PROGRAM_ELF)
ifneq ($(COREIP_MEM_WIDTH),)
software: $(PROGRAM_HEX)
endif
PROGRAM_SRCS = $(wildcard $(SRC_DIR)/*.c) $(wildcard $(SRC_DIR)/*.h) $(wildcard $(SRC_DIR)/*.S)
$(PROGRAM_ELF): \
$(PROGRAM_SRCS) \
$(BSP_DIR)/install/lib/libmetal.a \
$(BSP_DIR)/install/lib/libmetal-gloss.a \
$(BSP_DIR)/metal.lds
$(MAKE) -C $(dir $@) $(notdir $@) \
AR=$(RISCV_AR) \
CC=$(RISCV_GCC) \
CXX=$(RISCV_GXX) \
CFLAGS="-Os -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI) -g -mcmodel=medany -I$(abspath $(BSP_DIR)/install/include/)" \
CXXFLAGS="-Os -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI) -g -mcmodel=medany -I$(abspath $(BSP_DIR)/install/include/)" \
LDFLAGS="-nostartfiles -nostdlib -L$(sort $(dir $(abspath $(filter %.a,$^)))) -T$(abspath $(filter %.lds,$^))" \
LDLIBS="-Wl,--start-group -lc -lgcc -lmetal -lmetal-gloss -Wl,--end-group"
touch -c $@
.PHONY: clean-software
clean-software:
$(MAKE) -C $(SRC_DIR) clean
clean: clean-software
endif # BSP != legacy
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