switch to rv32i compiler

testbench/basic_test/Makefile

@@ -12,8 +12,8 @@ OBJ = $(notdir $(SOURCE_AS:.S=.o))
 OBJ += $(notdir $(SOURCE_C:.c=.o))
 
 CC = riscv64-linux-gnu-gcc-8
-# CFLAGS = -march=rv32i -mabi=ilp32
-CFLAGS = -march=rv64i -mabi=lp64
+CFLAGS = -march=rv32i -mabi=ilp32
+# CFLAGS = -march=rv64i -mabi=lp64
 
 CPPFLAGS =
 
@@ -21,7 +21,7 @@ AS = riscv64-linux-gnu-as
 ASFLAGS = $(CFLAGS)
 
 LD = riscv64-linux-gnu-ld
-LDFLAGS = -T
+LDFLAGS = -melf32lriscv_ilp32
 
 
 # $(info $$TESTBENCH_V is [${TESTBENCH_V}])
@@ -39,7 +39,7 @@ LDFLAGS = -T
 	$(CC) $(CPPFLAGS) $(CFLAGS) $^ -o $@
 
 %.elf: %.ld $(OBJ)
-	$(LD) $(LDFLAGS) $^ -o $@
+	$(LD) $(LDFLAGS) -T $^ -o $@
 
 %.hex: %.elf
 	riscv64-linux-gnu-objcopy --target=verilog $< $@