I just had a successful run with versaloon. I simply checked out v1.0 of the repository and flashed it to a blue pill board. After checking that the device get recognized by my computer with dmesg and lsusb, I connected the JTAG signals and 5V power.
I tested the setup with the pin-scan example. Since I had a different version of the board than the author did, I hat to make some changes to the code.
git diff
diff --git a/5a-75b/pin-scan/Makefile b/5a-75b/pin-scan/Makefile
index 2a870ce..a8978b6 100644
--- a/5a-75b/pin-scan/Makefile
+++ b/5a-75b/pin-scan/Makefile
@@ -7,7 +7,8 @@ top.json: $(SYNTH_SRCS) name.hex
yosys -p 'read_verilog $(SYNTH_SRCS); synth_ecp5 -top top -abc9 -json $@'
top.config: top.json top.lpf
- nextpnr-ecp5 --25k --package CABGA381 --speed 6 --lpf top.lpf --json top.json --textcfg top.config --freq 65
+ #nextpnr-ecp5 --25k --package CABGA381 --speed 6 --lpf top.lpf --json top.json --textcfg top.config --freq 65
+ nextpnr-ecp5 --25k --package CABGA256 --speed 6 --lpf top.lpf --json top.json --textcfg top.config --freq 65
top.svf: top.config
ecppack --input $< --svf $@
diff --git a/5a-75b/pin-scan/gen_lpf.py b/5a-75b/pin-scan/gen_lpf.py
index 5b6d44f..365443c 100755
--- a/5a-75b/pin-scan/gen_lpf.py
+++ b/5a-75b/pin-scan/gen_lpf.py
@@ -15,7 +15,8 @@ with open(sys.argv[2], 'w') as lpf, open(sys.argv[3], 'wb') as rom:
for l in cr:
if not l[0].isdigit():
continue
- if not l[7].isalnum():
+ # if not l[7].isalnum():
+ if not l[9].isalnum():
continue
if l[1][0:2] not in ('PT', 'PB', 'PL', 'PR'):
continue
@@ -23,7 +24,7 @@ with open(sys.argv[2], 'w') as lpf, open(sys.argv[3], 'wb') as rom:
continue
name = l[1]
- pad = l[7]
+ pad = l[9]
lpf.write('LOCATE COMP "pads[%d]" SITE "%s";\t# %s\n' % (i, pad, name))
lpf.write('IOBUF PORT "pads[%d]" PULLMODE=UP;\n' % (i,))
I also had to copy and modify an openocd config for the target platform
chubby.cfg
transport select jtag
adapter_khz 200
jtag newtap lfe5u25 tap -expected-id 0x41111043 -irlen 8 -irmask 0xFF -ircapture 0x05
init
scan_chain
svf -tap lfe5u25.tap -quiet -progress top.svf
shutdown
The programming is then done with OpenOCD.
$ sudo openocd -f interface/vsllink.cfg -f chubby.cfg
Open On-Chip Debugger 0.10.0
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 200 kHz
Info : Versaloon(0x15)by Simon(compiled on Jul 26 2020)
Info : USB_TO_XXX abilities: 0x00000208:0x010001E3:0xC0000007
Info : clock speed 200 kHz
Info : JTAG tap: lfe5u25.tap tap/device found: 0x41111043 (mfg: 0x021 (Lattice Semi.), part: 0x1111, ver: 0x4)
Warn : gdb services need one or more targets defined
TapName Enabled IdCode Expected IrLen IrCap IrMask
-- ------------------- -------- ---------- ---------- ----- ----- ------
0 lfe5u25.tap Y 0x41111043 0x41111043 8 0x05 0xff
svf processing file: "top.svf"
95%
Time used: 0m50s625ms
svf file programmed successfully for 620 commands with 0 errors
shutdown command invoked