diff --git a/ice40/benchmark/.gitignore b/ice40/benchmark/.gitignore
index 392dff13..306b5c6e 100644
--- a/ice40/benchmark/.gitignore
+++ b/ice40/benchmark/.gitignore
@@ -2,4 +2,5 @@ hx8kdemo.log
 hx8kdemo.blif
 hx8kdemo.json
 hx8kdemo_[an][0-9].asc
+hx8kdemo_[an][0-9].log
 report_[an][0-9].txt
diff --git a/ice40/benchmark/Makefile b/ice40/benchmark/Makefile
index 2dde17cc..5e16d9b0 100644
--- a/ice40/benchmark/Makefile
+++ b/ice40/benchmark/Makefile
@@ -10,10 +10,10 @@ report_n$1.txt: hx8kdemo_n$1.asc
 	icetime -m -r report_n$1.txt -d hx8k hx8kdemo_n$1.asc
 
 hx8kdemo_a$1.asc: hx8kdemo.blif
-	arachne-pnr -d 8k -p hx8kdemo.pcf -o hx8kdemo_a$1.asc -s $1 hx8kdemo.blif
+	arachne-pnr -d 8k -p hx8kdemo.pcf -o hx8kdemo_a$1.asc -s 1$1 hx8kdemo.blif > hx8kdemo_a$1.log 2>&1
 
 hx8kdemo_n$1.asc: hx8kdemo.json
-	../../nextpnr-ice40 --asc hx8kdemo_n$1.asc --json hx8kdemo.json --pcf hx8kdemo.pcf --hx8k --seed $1
+	../../nextpnr-ice40 --asc hx8kdemo_n$1.asc --json hx8kdemo.json --pcf hx8kdemo.pcf --hx8k --seed 1$1 > hx8kdemo_n$1.log 2>&1
 endef
 
 $(foreach i,0 1 2 3 4 5 6 7 8 9,$(eval $(call mkreport,$(i))))
@@ -21,3 +21,7 @@ $(foreach i,0 1 2 3 4 5 6 7 8 9,$(eval $(call mkreport,$(i))))
 hx8kdemo.blif: hx8kdemo.json
 hx8kdemo.json: hx8kdemo.v spimemio.v simpleuart.v picosoc.v picorv32.v
 	yosys -ql hx8kdemo.log -p 'synth_ice40 -top hx8kdemo -blif hx8kdemo.blif -json hx8kdemo.json' $^
+
+clean:
+	rm -f hx8kdemo.log hx8kdemo.blif hx8kdemo.json
+	rm -f hx8kdemo_[an][0-9].asc hx8kdemo_[an][0-9].log report_[an][0-9].txt