Added unused function pruning to RISCV build. Updated debugging commands.

Author: dgarske

arch.mk

@@ -47,6 +47,11 @@ ifeq ($(ARCH),RISCV)
   CROSS_COMPILE:=riscv32-unknown-elf-
   CFLAGS+=-fno-builtin-printf -DUSE_PLIC -DUSE_M_TIME -g -march=rv32imac -mabi=ilp32 -mcmodel=medany -nostartfiles -DARCH_RISCV
   LDFLAGS+=-march=rv32imac -mabi=ilp32 -mcmodel=medany
+  
+  # Prune unused functions and data
+  CFLAGS +=-ffunction-sections -fdata-sections
+  LDFLAGS+=-Wl,--gc-sections
+
   OBJS+=src/boot_riscv.o src/vector_riscv.o
   ARCH_FLASH_OFFSET=0x20000000
 endif

docs/Targets.md

@@ -69,8 +69,8 @@ Loading with JLink:
 
 ```
 JLinkExe -device FE310 -if JTAG -speed 4000 -jtagconf -1,-1 -autoconnect 1
-loadfile wolfboot.hex
-reset
+loadbin factory.bin 0x20010000
+rnh
 ```
 
 ### Debugging
@@ -81,9 +81,12 @@ In one terminal:
 `JLinkGDBServer -device FE310 -port 3333`
 
 In another terminal:
+`riscv64-unknown-elf-gdb test-app/image.elf -ex "set remotetimeout 240" -ex "target extended-remote localhost:3333"`
+or
 `riscv64-unknown-elf-gdb wolfboot.elf -ex "set remotetimeout 240" -ex "target extended-remote localhost:3333"`
 
 
+
 ## STM32-F407
 
 Example 512KB partitioning on STM32-F407