Updates to Freedom SoCs

bootrom/xip/Makefile

@@ -0,0 +1,45 @@
+# RISCV environment variable must be set
+
+CC=$(RISCV)/bin/riscv64-unknown-elf-gcc
+OBJCOPY=$(RISCV)/bin/riscv64-unknown-elf-objcopy
+CFLAGS=-march=rv32imac -mabi=ilp32 -O2 -std=gnu11 -Wall -I. -nostartfiles -fno-common -g
+LFLAGS=-static -nostdlib
+
+dtb := $(BUILD_DIR)/$(CONFIG).dtb
+$(dtb): $(BUILD_DIR)/$(CONFIG).dts
+	dtc -I dts -O dtb -o $@ $<
+
+.PHONY: dtb
+dtb: $(dtb)
+
+elf := $(BUILD_DIR)/xip.elf
+$(elf): xip.S $(dtb)
+	$(CC) $(CFLAGS) -DXIP_TARGET_ADDR=0x20400000 -DDEVICE_TREE='"$(dtb)"' $(LFLAGS) -o $@ $<
+
+.PHONY: elf
+elf: $(elf)
+
+bin := $(BUILD_DIR)/xip.bin
+$(bin): $(elf)
+	$(OBJCOPY) -O binary $< $@
+
+.PHONY: bin
+bin: $(bin)
+
+hex := $(BUILD_DIR)/xip.hex
+$(hex): $(bin)
+	od -t x4 -An -w4 -v $< > $@
+
+.PHONY: hex
+hex: $(hex)
+
+romgen := $(BUILD_DIR)/rom.v
+$(romgen): $(hex)
+	$(rocketchip_dir)/scripts/vlsi_rom_gen $(ROMCONF) $< > $@
+
+.PHONY: romgen
+romgen: $(romgen)
+
+.PHONY: clean
+clean::
+	rm -rf $(hex) $(elf) 

bootrom/xip/xip.S

@@ -2,25 +2,15 @@
 // Execute in place
 // Jump directly to XIP_TARGET_ADDR
 
-  .text
+  .section .text.init
   .option norvc
   .globl _start
 _start:
-  j 1f
-  nop
-  nop
-#ifdef CONFIG_STRING
-  .word cfg_string
-#else
-  .word 0  // Filled in by GenerateBootROM in Chisel
-#endif
-
-1:
+  csrr a0, mhartid
+  la a1, dtb
   li t0, XIP_TARGET_ADDR
   jr t0
 
   .section .rodata
-#ifdef CONFIG_STRING
-cfg_string:
-  .incbin CONFIG_STRING
-#endif
+dtb:
+  .incbin DEVICE_TREE