1 files changed, 79 insertions, 0 deletions
diff --git a/bootrom/bram.mk b/bootrom/bram.mk
new file mode 100644
index 0000000..2c7875a
--- /dev/null
+++ b/bootrom/bram.mk
@@ -0,0 +1,79 @@
+ifndef _BRAM_MK
+_BRAM_MK := # defined
+
+BRAM_ADDR := 0x1000
+
+BASEDIR := $(dir $(lastword $(MAKEFILE_LIST)))
+BASEDIR := $(BASEDIR:/=)
+DATADIR := $(BASEDIR)/common
+
+LDSCRIPT := $(DATADIR)/bram.ld
+MEMSCRIPT := $(DATADIR)/mem.awk
+
+BITFILEDIR := $(BASEDIR)/../bitfile
+BITFILE_VERSION ?= 0-1
+
+BITFILE := $(BITFILEDIR)/freedom-e300-arty-$(BITFILE_VERSION).bit
+CFGFILE := $(BITFILEDIR)/FreedomE-$(BITFILE_VERSION).cfg
+MEMINFO := $(BITFILEDIR)/freedom-e300-arty-$(BITFILE_VERSION).mmi
+BRAM_INST := `cat $(BITFILEDIR)/freedom-e300-arty-$(BITFILE_VERSION)-bootrom.txt`
+
+XLEN = 32
+BRAM_WIDTH=64
+
+all: mcs
+
+$(BITFILE):
+	@echo "In order to get Version $(BITFILE_VERSION) of the bitfile:"
+	@echo ""
+	@cat $(BITFILEDIR)/README.md
+
+CC := ../../toolchain/bin/riscv$(XLEN)-unknown-elf-gcc
+UPDATEMEM ?= updatemem
+
+CDEFINES += -DCFG_STRING=\"$(CFGFILE)\"
+
+CFLAGS ?= -m$(XLEN) -O2 -std=c11 -pedantic -Wall \
+	-nostartfiles -fno-common -mcmodel=medany -g \
+	$(CDEFINES)
+
+LDFLAGS ?= -T$(LDSCRIPT) -static -nostdlib
+OBJCOPY ?= objcopy
+elf: $(PROG).elf
+hex: $(PROG).hex
+mem: $(PROG).impl.mem
+mcs: $(PROG).mcs
+
+$(PROG).elf: $(SRCS) $(EXTRAS) $(CFGFILE)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(SRCS)
+
+$(PROG).hex: $(PROG).elf
+	$(OBJCOPY) -S -O verilog --change-addresses -$(BRAM_ADDR) $< $@
+
+# Manually reverse the byte order due to limitations in UpdateMEM.
+# Per UG898: "When UpdateMEM inputs data, it takes data from data input
+# files in Bit Lane sized chunks from the most right value first to the
+# left most.  For example, if the first 64 bits of input data are
+# 0xB47DDE02826A8419 then the value 0xB4 is the first value to be set
+# into a Block RAM."
+$(PROG).impl.mem: $(PROG).hex $(MEMSCRIPT)
+	awk -v WIDTH=$(BRAM_WIDTH) -v REVERSE=1 -f $(MEMSCRIPT) $< > $@
+
+.PHONY: $(PROG).mcs
+$(PROG).mcs : $(BITFILE) $(PROG).impl.mem
+	@echo ""
+	@echo ""
+	@echo "TO COMPLETE THE BUILD OF $(PROG).mcs, "
+	@echo "ENTER THE FOLLOWING IN THE VIVADO TCL WINDOW:"
+	@echo ""
+	@echo "cd `pwd`"
+	@echo ""
+	@echo "exec $(UPDATEMEM) -meminfo $(MEMINFO) -data $(PROG).impl.mem -proc $(BRAM_INST) -bit $(BITFILE) --out $(PROG).bit -force"
+	@echo ""
+	@echo "write_cfgmem -format mcs -interface spix4 -size 16 -loadbit {up 0x0 $(PROG).bit} -file $(PROG).mcs -force"
+	@echo ""
+
+clean:
+	rm -f -- $(foreach ext,elf hex impl.mem bit mcs,$(PROG).$(ext))
+
+endif # _BRAM_MK