Cleanup include paths and use linker files from nuclei-sdk

hw/bsp/gd32vf103_longan_nano/board.mk

@@ -1,51 +1,60 @@
 CROSS_COMPILE = riscv32-unknown-elf-
 
+# Submodules
 DEPS_SUBMODULES += hw/mcu/gd/nuclei-sdk
-
 NUCLEI_SDK = hw/mcu/gd/nuclei-sdk
-GD32VF103_SDK_SOC_COMMON = $(NUCLEI_SDK)/SoC/gd32vf103/Common
-GD32VF103_SDK_DRIVER = $(GD32VF103_SDK_SOC_COMMON)/Source/Drivers
+
+# Nuclei-SDK paths
+GD32VF103_SDK_SOC = $(NUCLEI_SDK)/SoC/gd32vf103
+GD32VF103_SDK_DRIVER = $(GD32VF103_SDK_SOC)/Common/Source/Drivers
+LONGAN_NANO_SDK_BSP = $(GD32VF103_SDK_SOC)/Board/gd32vf103c_longan_nano
+LINKER_SCRIPTS = $(LONGAN_NANO_SDK_BSP)/Source/GCC
+LIBC_STUBS = $(GD32VF103_SDK_SOC)/Common/Source/Stubs
+STARTUP_ASM = $(GD32VF103_SDK_SOC)/Common/Source/GCC
+
 SKIP_NANOLIB = 1
 
 CFLAGS += \
-  -march=rv32imac \
-  -mabi=ilp32 \
-  -mcmodel=medlow \
-  -mstrict-align \
-  -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_GD32VF103 \
-  -DDOWNLOAD_MODE=DOWNLOAD_MODE_FLASHXIP \
-  -DGD32VF103 
+	-march=rv32imac \
+	-mabi=ilp32 \
+	-mcmodel=medlow \
+	-mstrict-align \
+	-nostdlib -nostartfiles \
+	-DCFG_TUSB_MCU=OPT_MCU_GD32VF103 \
+	-DDOWNLOAD_MODE=DOWNLOAD_MODE_FLASHXIP \
+	-DGD32VF103 
 
 # mcu driver cause following warnings
-#CFLAGS += -Wno-error=unused-parameter
+CFLAGS += -Wno-error=unused-parameter
 
 # All source paths should be relative to the top level.
-LD_FILE = hw/bsp/$(BOARD)/gcc_gd32vf103xb_flashxip.ld # Longan Nano 128k ROM 32k RAM
-# LD_FILE = hw/bsp/$(BOARD)/gcc_gd32vf103x8_flashxip.ld # Longan Nano Lite 64k ROM 20k RAM 
+LD_FILE = $(LINKER_SCRIPTS)/gcc_gd32vf103xb_flashxip.ld # Longan Nano 128k ROM 32k RAM
+#LD_FILE = $(LINKER_SCRIPTS)/gcc_gd32vf103x8_flashxip.ld # Longan Nano Lite 64k ROM 20k RAM 
 
 SRC_C += \
-  src/portable/st/synopsys/dcd_synopsys.c \
+	src/portable/st/synopsys/dcd_synopsys.c \
 	$(GD32VF103_SDK_DRIVER)/gd32vf103_rcu.c \
 	$(GD32VF103_SDK_DRIVER)/gd32vf103_gpio.c \
 	$(GD32VF103_SDK_DRIVER)/Usb/gd32vf103_usb_hw.c \
 	$(GD32VF103_SDK_DRIVER)/gd32vf103_usart.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/sbrk.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/close.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/isatty.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/fstat.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/lseek.c \
-	$(GD32VF103_SDK_SOC_COMMON)/Source/Stubs/read.c 
+	$(LONGAN_NANO_SDK_BSP)/Source/gd32vf103c_longan_nano.c \
+	$(LIBC_STUBS)/sbrk.c \
+	$(LIBC_STUBS)/close.c \
+	$(LIBC_STUBS)/isatty.c \
+	$(LIBC_STUBS)/fstat.c \
+	$(LIBC_STUBS)/lseek.c \
+	$(LIBC_STUBS)/read.c 
 
 SRC_S += \
-  $(GD32VF103_SDK_SOC_COMMON)/Source/GCC/startup_gd32vf103.S \
-  $(GD32VF103_SDK_SOC_COMMON)/Source/GCC/intexc_gd32vf103.S
+	$(STARTUP_ASM)/startup_gd32vf103.S \
+	$(STARTUP_ASM)/intexc_gd32vf103.S
 
 INC += \
-  $(TOP)/hw/bsp/$(BOARD) \
+	$(TOP)/hw/bsp/$(BOARD) \
 	$(TOP)/$(NUCLEI_SDK)/NMSIS/Core/Include \
-	$(TOP)/$(GD32VF103_SDK_SOC_COMMON)/Include \
-	$(TOP)/$(GD32VF103_SDK_SOC_COMMON)/Include/Usb \
+	$(TOP)/$(GD32VF103_SDK_SOC)/Common/Include \
+	$(TOP)/$(GD32VF103_SDK_SOC)/Common/Include/Usb \
+	$(TOP)/$(LONGAN_NANO_SDK_BSP)/Include
 
 # For freeRTOS port source
 FREERTOS_PORT = RISC-V