[BSP][K230] Add soft-fpu option for k230

bsp/k230/Kconfig

@@ -10,14 +10,14 @@ source "$RTT_DIR/Kconfig"
 source "$PKGS_DIR/Kconfig"
 rsource "board/Kconfig"
 
-config BOARD_fpgac908
+config BOARD_C908
     bool
     select ARCH_RISCV64
     select RT_USING_COMPONENTS_INIT
     select RT_USING_USER_MAIN
     select RT_USING_CACHE
 	select ARCH_MM_MMU
-    select ARCH_RISCV_FPU_D
+    select ARCH_RISCV_FPU
     select ARCH_REMAP_KERNEL if RT_USING_SMART
     default y
 
@@ -38,3 +38,17 @@ choice BSP_ROOTFS_TYPE
         select RT_USING_DFS_CROMFS
         select PKG_USING_ZLIB
 endchoice
+
+choice BSP_RISCV_USING_FPU
+    prompt "FPU precision"
+    default BSP_RISCV_FPU_D
+
+    config BSP_RISCV_FPU_SOFT
+        bool "Software floating-point"
+        select ARCH_RISCV_FPU
+
+    config BSP_RISCV_FPU_D
+        bool "Double-precision floating-point with Vector"
+        select ARCH_RISCV_FPU_D
+        select ARCH_RISCV_VECTOR
+endchoice

bsp/k230/SConstruct

@@ -8,7 +8,6 @@ from rtconfig import RTT_ROOT
 import sys
 
 def generate_ldscript(input, output):
-
     if not os.path.exists(input):
         print('Error: file', input, 'not found')
         return
@@ -30,12 +29,20 @@ def generate_ldscript(input, output):
 
         print(output, 'is generated from', input)
 
-
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+# apply soft-FPU config
+options = LocalOptions("rtconfig.h")
+soft_fpu = GetLocalDepend(options, 'BSP_RISCV_FPU_SOFT')
+if soft_fpu:
+    rtconfig.DEVICE = rtconfig.DEVICE.replace('-march=rv64imafdcv -mabi=lp64d', '-march=rv64imafdc -mabi=lp64')
+    rtconfig.CFLAGS = rtconfig.CFLAGS.replace('-march=rv64imafdcv -mabi=lp64d', '-march=rv64imafdc -mabi=lp64')
+    rtconfig.LFLAGS = rtconfig.LFLAGS.replace('-march=rv64imafdcv -mabi=lp64d', '-march=rv64imafdc -mabi=lp64')
+    rtconfig.AFLAGS = rtconfig.AFLAGS.replace('-march=rv64imafdcv -mabi=lp64d', '-march=rv64imafdc -mabi=lp64')
+
 DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,