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Dobrica Pavlinušić's random unstructured stuff
ULX3S Lobby: Revision 16
Helpful notes from chat about ULX3S i2chttps://gitter.im/ulx3s/Lobby?at=5dfcf29acf771f7708ff69e9 It should not be that hard. I have i2c in SaxonSoc in other projects such as https://github.com/SpinalHDL/SaxonSoc/blob/dev/hardware/scala/saxon/board/blackice/BlackiceSocArduino.scala#L25 The generated board support packages include a generated dts, but it is not used yet and the simple i2c generator that I wrote does not generate the dts. There is a problem building SaxonSoc Linux, that some build randomly do not work. It seems to be something to do with SDRAM access. @Dolu1990 is about to redo the SDRAM access for the Ulx3s, which should make it more reliable and faster, as he plans to support double frequency access. There is a lot of information on the development of the u-boot version here , which might be useful to you - SpinalHDL/SaxonSoc#7 https://github.com/SpinalHDL/SaxonSoc/pull/7 I2c Linux support will also need a spinal.lib driver here - https://github.com/SpinalHDL/linux/tree/linux-5.0.y/drivers/i2c The terasic De1Soc version of SaxonSoc Linux has a dts entry for an led for disk access - https://github.com/SpinalHDL/buildroot/blob/saxon/board/spinal/saxon_default/spinal_saxon_default_de1_soc.dts#L194 We really need a better GPIO mapping for the Ulx3s. That might involve including adding a second gpio peripheral to the hardware (gpioB) and doing a better lpf file mapping to pins. It might mean increasing the niumbers of pins that support interrupts. It would be good to include access to the buttons and switches and to make it easy to add Pmods that need interrupt support like the enc28j60 one. ecp5pllMario Hoffmann @hoffma_gitlab Aug 05 16:11 Hello, I wanted to have a 90 degree shifted clock. I was trying out the ecp5pll from @emard. I get it running and the clock adjustment seems to work, but somehow it does not get shifted for me. Is this currently not working with yosys and so forth, is there anything I have to take care of, or might it just be a bug on my side? Tried to search this chat a bit and just searched a bit on the internet but the things I found about it were quite old and not necessarily about my problem. Any ideas? I am using the vhdl version btw emard @emard Aug 05 16:59 There's some order of signals and small delays between them for dynamic shifting to work. https://github.com/emard/ulx3s-misc/blob/master/examples/sdram/memtest_mister/hdl/top/top_memtest.v#L73 here is module to control phase shifts by pressing of BTN for testing of SDRAM with variable phase shift of the clock to chip Mario Hoffmann @hoffma_gitlab Aug 05 17:01 alright, ill look at that. thanks Mario Hoffmann @hoffma_gitlab Aug 05 17:53 Oh nice it works. My thinking was just a bit wrong and there was a little bug too. Thanks emard @emard Aug 05 18:07 ecp5pll has possibility for fine-precision phase adjustment but this simple BTN module doesn't generate proper phaseloadreg signal https://github.com/emard/ulx3s-misc/blob/master/examples/sdram/memtest_mister/hdl/btn_ecp5pll_phase.v#L51 displayhttps://gitter.im/ulx3s/Lobby?at=5f3b7df7ee58011680b36cb0 emard @emard Aug 18 09:06 SSD1331 96x64 is full featured OLED beautiful contrast, but currently best buy is ST7789 1.3" 240x240 LCD less contrast but more pix and less $. Do not solder directly the display. Solder female 7-pin header and plug the display. Mechanical stabilization can be 3D printed https://github.com/emard/ulx3s/tree/master/box it will "work" properly only if whole box is printed. There is no problem with heat normally to FPGA but SSD1331 with wrong software commands can become hot to fry fingers and smoke, it happened to me once, colors faded and I just replaced display. Onboard USB-SERIAL can provide 2nd JTAG channel for openocd debugger of RISCV processor it will work but it will be VERY slow (for debug single step ok, but for transferring Mbps no). rtchttps://gitter.im/ulx3s/Lobby?at=5f3b86a1a8c178017657caf6 emard @emard Aug 18 09:43 Yes for RTC I first saw it "works" but after few reboots I found out that it resets to compile time or something. Core could consult onboard RTC using i2c and then set unix time integer counter which will continue ticking afterwards. For setting RTC we have esp32 and other options. Btw import ntptime; ntptime.settime() will set ESP32 localtime() from a pool of network NTP servers and then esp32 can initialize onboard RTC here I have played with this https://github.com/emard/ulx3s-misc/tree/master/examples/rtc/micropython-mcp7940n/esp32 https://gitter.im/ulx3s/Lobby?at=5f3dbb34750a2741302ea427 emard @emard Aug 20 01:52 @pnru_gitlab here is 8-bit master interface. I haven't tested it very simple by reading seconds and seems ok https://github.com/emard/ulx3s-misc/blob/master/examples/rtc/i2c_master/proj/hdl/i2c_master_8bit.v https://gitter.im/ulx3s/Lobby?at=5f3e2d1c07c30d132a9c4f58 emard @emard Aug 20 09:58 when we are at verilog, I have found on the net several i2c bidirectional bridges. Only one code worked at our board but it works only if compiled by diamond. trellis compiles but doesn't work. Can someone take a look what I have missed: bridge: https://github.com/emard/ulx3s-misc/blob/master/examples/rtc/micropython-mcp7940n/proj/hdl/i2c_bridge.v toplevel usage: https://github.com/emard/ulx3s-misc/blob/master/examples/rtc/micropython-mcp7940n/proj/top/top_i2c_bridge.v emard @emard Aug 20 22:04 for me it works for any gpdi_scl/sda PULLMODE=UP, DOWN, or NONE so it's not pull setting. I can prepare a bitstream and micropython to ulx3s-bin example that initializes the clock setting time from NTP emard @emard Aug 20 22:18 https://github.com/emard/ulx3s-bin/tree/master/esp32/micropython/rtc can you try this RTC esp32 example for NTP setting? >>> rtcdemo.mcp.time should advance seconds emard @emard Aug 21 00:04
RTC traffic also appears at GPDI connector (if there's i2c chip 3.3V->5V adapter soldered on board PCA9306D). Some monitors may hold i2c lines. Also gpdi connector can be used to monitor traffic if e.g. you have hdmi breakout board emard @emard Aug 21 00:09
UPS but we have problem there will be 2 RTC chips colliding address :) emard @emard Aug 21 18:14 I fixed i2c_bridge.v to work with both trellis and diamond. Paul Ruiz @pnru_gitlab Aug 21 23:35
Which way does the battery go? I think with the + side (cap) up and the - side (ribbed) to the PCB? emard @emard Aug 21 23:59
Battery goes + up (larger part of battery should be in contact with metallic holder soldered) - down (smaller part of battery in contact to big circular pad on the PCB scopeiohttps://gitter.im/ulx3s/Lobby?at=5f3c27ffa05e464346d2f6ea emard @emard Aug 18 21:11 @gkankanh MAX11125 is 1Msa/s total so e.g. if you use 4ch then each channel will be 0.25MSa/s per channel. For oscilloscope it, we have ready solution at hdl4fpga/ULX3S/scopeio you will see traces on monitor. For analysis, onboard USB-serial can do 3Mbps so it could be nearly useable. For faster ADC, yes 100 Mbit ethernet ETH8720 from ebay, module for 2.2$ and for example ebay's AN108 AD/DA module 32MSa/s input, 125MSa/s output https://www.ebay.com/itm/ADDA-Module-Data-Signal-Acquisition-High-speed-Directly-pluggable-connector-/253556250998 also scopeio supports it how to solder headershttps://gitter.im/ulx3s/Lobby?at=5f3cd88378f4a801801336cb emard @emard Aug 19 09:45 To have GP/GN not be swapped from "default" design, Either solder 90° FEMALE headers on top side of board (nice for PMODs directly) or straight 0° MALE pins down on bottom side of board. PMODs can also plug to other end of flat cable and pinout will be identical as if 90° was soldered onboard. nmingenhttps://gitter.im/ulx3s/Lobby?at=5f3cfbce8b8d4f633effcea7 Lawrie Griffiths @lawrie Aug 19 12:15
I am using Ubuntu 20.04, so I need to use pip3 not pip. (You can't get python2 pip on 20.04 easily).
from nmigen import *
from nmigen_boards.ulx3s import *
class Blinky(Elaboratable):
def elaborate(self, platform):
led = platform.request("led", 0)
timer = Signal(26)
m = Module()
m.d.sync += timer.eq(timer + 1)
m.d.comb += led.o.eq(timer[-1])
return m
if __name__ == "__main__":
platform = ULX3S_85F_Platform()
platform.build(Blinky(), do_program=True)
https://github.com/GuzTech/ulx3s-nmigen-examples https://github.com/greatscottgadgets/luna SDRAM memtesthttps://gitter.im/ulx3s/Lobby?at=5f4ea96249a1df0a12c0d83e Lawrie Griffiths @lawrie Sep 01 22:04
@pnru_gitlab @Dolu1990 asked these questions about using the SDRAM, which I thought you might know something about from all your recent work on SDRAM drivers: Dolu1990 @Dolu1990 Sep 01 22:05 Moaaaar powaaaaaaaa emard @emard Sep 01 22:36 oooh yeea :)) if you want to push SDRAM near the edge and give it some heat, on selected designs it can push 133MHz chips to 180-200 MHz, fmax depends on each board. 12F performs better than 85F. Here's memtest https://github.com/emard/ulx3s-misc/tree/master/examples/sdram/memtest_mister shows results on DVI monitor and with BTNs can adjust phase shift dynamically and watch for errors. Dolu1990 @Dolu1990 Sep 01 23:01
<3 emard @emard Sep 01 23:08 Yes this has a classic sdram driver that normally needs 90° phase offset to chip hardware, but as fmax is getting higher the actual phase shift which makes it really work moves. PLL is used to provide phase shift. Paul has made a better sdram driver with cool vendor-independent delay solution with a number of NOT gates.Only ns delay per NOT gate remains vendor dependent Dolu1990 @Dolu1990 Sep 01 23:09 ok :D Paul Ruiz @pnru_gitlab 00:02
@lawrie @Dolu1990 I am not sure I understand the SDRAM questions. In any case, my latest version is here: https://gitlab.com/pnru/cortex/-/blob/master/sdram.v I am not sure what you mean by "using DDR io" - does the SDRAM chip on the ULX3S support DDR? Maybe you mean by DDR that it runs at twice the speed of the CPU or that it uses burst size 2? I don't know what the critical path in the SDRAM chip is, but I do have a hypothesis. When working with a CAS delay of 3 clocks, the data really arrives after 2 clocks plus 6-7ns (spending on the speed grade). If you clock a grade 6 chip (PC166) faster, a clock cycle will take less than 6ns and the data will only arrive after the third rising clock edge. My guess is that the 6-7ns is related to the speed of the sense amplifiers or something like that. resource utilizationhttps://gitter.im/ulx3s/Lobby?at=5f4f8c30d4f0f55ebbf93007 Dolu1990 @Dolu1990 Sep 02 14:12
Is somebody aware of a way to get hearchical ressource utilisation report out from yosys/next-pnr for ECP5 ? David Shah @daveshah1 Sep 02 14:18 You can get a hierarchical report with Yosys by passing -noflatten to synth_ecp5 ps2 keyboardhttps://gitter.im/ulx3s/Lobby?at=5f57e59c59ac794e02f71d14 Kid CUDA @KidCUDA_gitlab Sep 08 22:12
anyone used a PS2 keyboard with ULX3S? emard @emard Sep 08 22:52
@KidCUDA_gitlab US2 pins are 5V tolerant, limited by R and Zener diodes. Still some PS/2 keyboards don't accept 3.3V levels. Best is to obtain combo PS/2+USB they usually work in both modes for ULX3S cortexsource: https://gitlab.com/pnru/cortex https://gitter.im/ulx3s/Lobby?at=5f500a7eec534f584fdbeb15 Paul Ruiz @pnru_gitlab Sep 02 23:11 8s is super-comfortable! Btw I wonder how did cortex start, before it ever booted they need some filesystem to hold files. Is cortex filesystem mountable by modern linux? How did they made it in early times? The Cortex was a traditional home computer with Basic in its day. Running Unix on it was my project some 6-7 years ago. It was a long journey: porting a C compiler and tool chain, building simple kernels with a linked in user program (downloaded to the H/W via something similar to S-records), etc. When the time for disk access came, I used a tool to create & manage disk images.
For the original Unix, the file system was almost the first thing that was built, after the assembler (that is how a.out got its name: assembler output). An empty disk image was written by a custom format program. Files were then loaded from paper tape. Some 1969/1970 Unix code can be found here: emard @emard Sep 02 23:14 Ahaaaa so unix was not all the time available on cortex hardware. Still I'd wanted to know how did you initially start with populated filesystem. Normally e.g. if we have linux on riscv, we can mount the same partition on x86 PC, copy files and and it will work on riscv, but how was this done on cortex? So If I understood, you have a tool that from a directory creates disk image, but there's currently no support to actually mount cortex fs on linux for example. linux has some possibility to write a user-space fs driver like "fuse" but I ghess thats difficult and fragile Paul Ruiz @pnru_gitlab Sep 02 23:29
You can follow my journey here, in 315 commits:
I use a program ("ufs") which creates a disk image from scratch and then adds files to it. The source code is here: Even on the mini Cortex hardware, the CF Card uses FAT formatting and has an image file on it. I make sure the image is contiguous and the boot loader lets the Unix disk driver know in which sector the image starts. This way I can simply copy disk images to the CF card without needing to use special tools. Actually, the card also has disk images for other OS's as well - MDEX and NOS, which are somewhat similar to CP/M and MS-DOS 3 respectively. emard @emard Sep 02 23:44 There has been a lot of concentrated effort! The idea to use contiguous file in FAT is very good, so the CF itself can be easily written from laptop. Paul Ruiz @pnru_gitlab Sep 02 23:53 Thank you. The ulx3s Cortex has it even easier: because of the ESP32, now I don't even have to worry about things being contiguous and I can ftp disk images without having to handle the SD card. emard @emard Sep 03 00:34 yeees it was a piece of luck that for esp32 appeared good micropython support with almost all important things working and that spi-jtag adventure turned out successful. I have ulx3s with SD in a box and once inserted SD I never move out, just ftp files. Things will be even better when WROVER-E prototype starts working, 4MB RAM, 16MB FLASH no more out of memory. Bitstreams could be unzipped on-the-fly, even larger FLASH chips supported with 64K and 256K erase blocks (esp32 must buffer data size of erase block and now we are struggling with 4K buffers) saxonsoc audiohttps://gitter.im/ulx3s/Lobby?at=5f6482c3603d0b37f43d3ec0 Lawrie Griffiths @lawrie Sep 18 11:49 I have a 4-cpu 85F SaxonSoc version with music, working now.
It is now inSmp/bitstreams/ulx3s_85f_blue_4core_saxonsoc.bit
root@buildroot:~# cat .asoundrc
pcm.!default {
type plug
slave.pcm "softvol" #make use of softvol
}
pcm.softvol {
type softvol
slave {
pcm "hw:0,0" #redirect the output to dmix (instead of "hw:0,0")
}
control {
name "PCM" #override the PCM slider to set the softvol volume level globally
card 0
}
}
To play music do: mpg123 -T -f 4096 -m file.mp3. https://gitter.im/ulx3s/Lobby?at=5f648d8cf51808513b4f7db5 olu1990 @Dolu1990 Sep 18 12:35
.asoundrc isn't necessary, it just add volume controles in alsamixer app saxonsoc rtchttps://gitter.im/ulx3s/Lobby?at=5f69eb5d6a6e094525ac61f5 https://gitter.im/ulx3s/Lobby?at=5f69f087e1dd7c19548aad12 Dolu1990 @Dolu1990 Sep 22 14:39 got the rtc to start counting seconds and read it via : i2cset -y 0 0x6F 0x00 0x80 sleep 4 i2cget -y 0 0x6F 0x00 https://gitter.im/ulx3s/Lobby?at=5f6a4562e1dd7c19548b96f0 Lawrie Griffiths @lawrie Sep 22 20:41
oot@buildroot:~# cat date.sh
R6=`i2cget -y 0 0x6f 0x06`
R5=`i2cget -y 0 0x6f 0x05`
R4=`i2cget -y 0 0x6f 0x04`
R2=`i2cget -y 0 0x6f 0x02`
R1=`i2cget -y 0 0x6f 0x01`
YY="${R6:2:2}"
MON="$((${R5:2:2}-20))"
DD="${R4:2:2}"
HH="${R2:2:2}"
MM="${R1:2:2}"
echo "20$YY-$MON-$DD $HH:$MM"
root@buildroot:~# ./date.sh
2020-9-22 19:40
date -s "`./date.sh`"
https://gitter.im/ulx3s/Lobby?at=5f6a69588fe6f11963554984 emard @emard Sep 22 23:15
#include <stdio.h>
#include <stdlib.h>
#define I2C_SLAVE 0x703
#define O_RDWR 2
int i2c_rtc;
void rtc_open(int addr)
{
i2c_rtc = open("/dev/i2c-0", O_RDWR);
ioctl(i2c_rtc, I2C_SLAVE, addr);
}
void rtc_read(unsigned char *buf, int reg, int n)
{
buf[0] = reg;
write(i2c_rtc, buf, 1);
read(i2c_rtc, buf, n);
}
void i2cdemo(void)
{
int i;
unsigned char buf[7];
// mask for BCD SEC MIN HOUR WKDAY DAY MONTH YEAR
unsigned char mask[7] = {0x7F, 0x7F, 0x3F, 0x07, 0x3F, 0x1F, 0xFF};
rtc_read(buf, 0, sizeof(buf));
for(i = sizeof(buf)-1; i >= 0; i--)
printf(" %02x", buf[i] & mask[i]);
printf("\n");
}
int main(int argc, char *argv[])
{
int i;
rtc_open(0x6F);
for(i = 0; i < 60; i++)
{
i2cdemo();
sleep(1);
}
return 0;
}
root@buildroot:/home/root/rtc# ./a.out
20 09 22 02 21 14 27
20 09 22 02 21 14 28
20 09 22 02 21 14 29
20 09 22 02 21 14 30
20 09 22 02 21 14 31
saxonsoc jtaghttps://gitter.im/ulx3s/Lobby?at=5f78c209dfe47e4d57464c10 Lawrie Griffiths @lawrie Oct 03 20:25 The pins to connect to are these - https://github.com/SpinalHDL/SaxonSoc/blob/dev-0.1/hardware/synthesis/radiona/ulx3s/smp/ulx3s_v20_linux_uboot.lpf#L342-L348 emard @emard Oct 03 20:26
I tried to upload SVF file and it works, (fast). Yes, this pins connection is important. Is there a simple JTAG openocd scan command I can test it to make sure I connected all jtag newtap lfe5 tap -expected-id 0x21111043 -irlen 8 -irmask 0xFF -ircapture 0x5 Dolu1990 @Dolu1990 Oct 03 20:29 hoo when openocd run it scan everything emard @emard Oct 03 20:29 yes yes I see it on above linked script Dolu1990 @Dolu1990 Oct 03 20:30 i'm not sur there a command to rescan, just rerun it ^^ emard @emard Oct 03 20:31 OK I need to make a bit on the solder and pins to board, then I will test it and when I get vexrisc scanned by openocd jtag I will put it online for remote access Dolu1990 @Dolu1990 Oct 03 20:31 you should get a scan like 0x10001FFF Lawrie Griffiths @lawrie Oct 03 20:33 @Dolu1990 Doesn't @emard need to build your version of openocd - https://github.com/SpinalHDL/openocd_riscv Dolu1990 @Dolu1990 Oct 03 20:34
Yes Dolu1990 @Dolu1990 Oct 03 21:02 sudo apt-get install libtool automake libusb-1.0.0-dev texinfo libusb-dev libyaml-dev pkg-config for the full depedency on debian emard @emard 00:00 Escape character is '^]'. Open On-Chip Debugger > init > scan_chain TapName Enabled IdCode Expected IrLen IrCap IrMask -- ------------------- -------- ---------- ---------- ----- ----- ------ 0 fpga_spinal.bridge Y 0x10001fff 0x10001fff 4 0x01 0x0f Got openocd to connect https://gitter.im/ulx3s/Lobby?at=5f7c33646e0eb844696af0a2 Lawrie Griffiths @lawrie 11:05 You then need a usb JTAG device, preferably an FT2232 one, and you connect the pins to gn0 - gn3. I have not used openocd with SaxonSoc for a while, but @Dolu1990 uses it all the time. micropython sockshttps://gitter.im/ulx3s/Lobby/archives/2020/10/10?at=5f820bfb07361f0cc6430489 kost @kost Oct 10 19:31 UTC
since you guys around SaxonSoc made such a great progress. I had to do my part of the promise.
import upip
upip.install('micropython-socks')
and then you can just simply say: import socks socks.start()
it will start listening on 0.0.0.0:1080 for SOCKS5 connections. curl --socks5 192.168.4.1:1080 http://ifconfig.co nmigen - OV7670 with st7789https://gitter.im/ulx3s/Lobby?at=5f949a4e6c8d484be2a6df34 Lawrie Griffiths @lawrie Oct 24 23:19 @goran-mahovlic I now have a version of the OV7670 camera application working in nmigen with the st7789 display - https://github.com/lawrie/ulx3s-nmigen-examples/tree/master/ov7670 oberonhttps://gitter.im/ulx3s/Lobby?at=5f949d40270d004bcfea9716 Charles Perkins @charlesap Oct 24 23:31 @pnru_gitlab @emard I have created a new disk image based on the www.projectoberon.com sources, only adding some more LED output in the inner core boot process. Here's a zip file of a disk image that you should be able to directly write to an SD card: https://github.com/io-core/io/blob/main/images/ledboot.img.zip ... this image has the Oberon partition at the correct offset but I did not bother to format the first part with a FAT partition. It boots on my ulx3s with the earlier Oberon .bit file. Here's the meaning of the LEDs on booting: LEDs: 7------- In BootLoad Firmware LEDs: 7-----1- In BootLoad Firmware LEDs: 7----2-- In BootLoad Firmware LEDs: -------0 Control transferred to Modules LEDs: ------1- Control transferred to Files LEDs: -----2-- Control transferred to Kernel LEDs: ----3--- In Kernel - Temporary Trap installed LEDs: ---4---- In Kernel - Stack and heap origins and limits configured LEDs: --5----- Kernel SecMap initialized, control transferred to FileDir LEDs: -6------ Directory traversal complete LEDs: 7------- Sectors marked, control transferred to Modules which has loaded Oberon. LEDs: -------- Icons are defined, display subsystem initialized, ready to load System. LEDs: --5----0 GC in the Oberon Loop LEDs: --5---10 GC in the Oberon Loop LEDs: --5--210 GC in the Oberon Loop LEDs: --5-----
If there is an early trap before the system introduces a nicer printing trap the leds will fast-blink now with the trap value (0-7). The Oberon source code modified with the LED output is here:
https://github.com/io-orig/projectoberon/blob/main/Kernel.Mod.NL oled pinshttps://gitter.im/ulx3s/Lobby?at=5fa2bcb374152347c213d4ae emard @emard Nov 04 11:59
@sthornington yes bitstream projects do rearrange pins. At least GND and 3.3V must match, FPGA is flexible about pins, practical is to plug display directly without wires. Original markings are for SSD1331. ST7789 7-pin is similar but I think pin has BL (backlight) function instead of CS. wifi_gpio17 refers to the same thing and also ESP32 is flexible about SPI pinout so you can match practicaly any combination. @sthornington of course GND and VCC can't be swapped by FPGA, because OLED draws current and must connect to hard power supply, can't be powered from FPGA 16mA pins (so low power devices actually could swap even GND/VCC). new board will have 8-pin LCD header instead of 7-pin but there's really crowded with routing so additional 2 pins are nearly impossible. But if display has GND and VCC swapped, then it will fit to external connector GN/GN 0-27 so there's still a possibility to plug such display directly on board on the side rtc - i2c master examplehttps://gitter.im/ulx3s/Lobby?at=5fa7ba79c6fe0131d4e19d31 emard @emard Nov 08 10:29 There is example https://github.com/emard/ulx3s-misc/tree/master/examples/rtc/i2c_master/proj which makes i2c master in verilog, talks to RTC and displays time as HEX on DVI and LCD. There can't be interference with ESP32 because ESP32 is not directly connected to RTC, FPGA is between them. rt2232 second channel openocdhttps://gitter.im/ulx3s/Lobby?at=5fc57a82150b213e980592d8 emard @emard 00:04 @sthornington if you have external ft2232 it is fastest and normally used as openocd jtag debugger for softcore cpus like litex or saxonsoc linux. Secondary US1 channel is possible and fully supported by openocd, but it will be unacceptably slow to transfer big files like kernel or root fs images. https://github.com/emard/ulx3s-jtagthru/blob/master/scripts/ft231x2.ocd here is some project that has openocd script to export secondard jtag channel to external pins but normally you can use it internally to soft-core too. See also the schematics for your board (v3.0.8) how FTDI is connected to FPGA |