Enforce bender directory to avoid extra checkout (#82)

* Enforce bender directory to avoid extra checkout

To avoid a checkout of dependencies within the serial_link, setting the
bender directory with -d allows for re-use of available dependencies.

* Fix elfloader path

Makefile

@@ -6,7 +6,8 @@
 # Christopher Reinwardt <creinwar@student.ethz.ch>
 # Paul Scheffler <paulsc@iis.ee.ethz.ch>
 
-CHS_ROOT ?= .
+CHS_ROOT ?= $(shell pwd)
+BENDER	 ?= bender -d $(CHS_ROOT)
 
 include cheshire.mk
 

cheshire.mk

@@ -101,7 +101,7 @@ $(AXI_VGA_ROOT)/.generated:
 # Custom serial link
 $(CHS_SLINK_DIR)/.generated: $(CHS_ROOT)/hw/serial_link.hjson
 	cp $< $(dir $@)/src/regs/serial_link_single_channel.hjson
-	flock -x $@ $(MAKE) -C $(CHS_SLINK_DIR) update-regs && touch $@
+	flock -x $@ $(MAKE) -C $(CHS_SLINK_DIR) update-regs BENDER="$(BENDER)" && touch $@
 
 CHS_HW_ALL += $(CHS_ROOT)/hw/regs/cheshire_reg_pkg.sv $(CHS_ROOT)/hw/regs/cheshire_reg_top.sv
 CHS_HW_ALL += $(CLINTROOT)/.generated
@@ -134,7 +134,7 @@ CHS_BOOTROM_ALL += $(CHS_ROOT)/hw/bootrom/cheshire_bootrom.sv $(CHS_ROOT)/hw/boo
 
 $(CHS_ROOT)/target/sim/vsim/compile.cheshire_soc.tcl: Bender.yml
 	$(BENDER) script vsim -t sim -t cv64a6_imafdcsclic_sv39 -t test -t cva6 -t rtl --vlog-arg="$(VLOG_ARGS)" > $@
-	echo 'vlog "$(CURDIR)/$(CHS_ROOT)/target/sim/src/elfloader.cpp" -ccflags "-std=c++11"' >> $@
+	echo 'vlog "$(realpath $(CHS_ROOT))/target/sim/src/elfloader.cpp" -ccflags "-std=c++11"' >> $@
 
 $(CHS_ROOT)/target/sim/models:
 	mkdir -p $@