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openFPGALoader
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Moved the Note regarding OpenBSD from the README.md into the doc/guide/troubleshooting.rst.

This commit is contained in:
Thomas Dettbarn 2026-05-15 15:01:37 +02:00
parent 5a3b8b943e
commit 7887cc0597
2 changed files with 34 additions and 34 deletions
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34
README.md
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@ -156,40 +156,6 @@ OPENFPGALOADER_SOJ_DIR=/somewhere openFPGALoader xxxx
`OPENFPGALOADER_SOJ_DIR` must point to directory containing **spiOverJtag**
bitstreams.
## Disabling uftdi on OpenBSD
Certain evaluation boards can cause the following error when running openFPGAloader on OpenBSD:
```
fail to read data usb bulk read failed
JTAG init failed with: low level FTDI init failed
```
This issue is most likely caused by the uftdi module, trying to access the device. To disable it,
the following commands can be used:
```bash
# doas config -e -f -o /bsd.nouftdi /bsd
OpenBSD 7.8 (GENERIC) #54: Sun Oct 12 12:45:58 MDT 2025
deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
Enter 'help' for information
ukc> disable uftdi*
356 uftdi* disabled
ukc> disable uftdi0
ukc> disable uftdi1
ukc> quit
Saving modified kernel.
# reboot
```
At the boot prompt, typing in
```
boot> boot /bsd.nouftdi
```
will boot the new kernel with the disabled module.
## Sponsors/Partners

34
doc/guide/troubleshooting.rst
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@ -76,3 +76,37 @@ After changing groups or rules, reload udev rules, then unplug/replug the
converter and log out/login again.
Reference: `install guide (udev rules section) <https://trabucayre.github.io/openFPGALoader/guide/install.html#udev-rules>`_.
Unable to flash device on OpenBSD: `JTAG init failed with: DirtyJtag: fails to open device`
===========================================================================================
Certain evaluation boards may show the following error message when running openFPGAloader on OpenBSD:
.. code:: bash
fail to read data usb bulk read failed
JTAG init failed with: low level FTDI init failed
This issue is most likely caused by the uftdi module, which has already locked the device.
Disabling the module can be achieved with the following commands:
.. code:: bash
# doas config -e -f -o /bsd.nouftdi /bsd
OpenBSD 7.8 (GENERIC) #54: Sun Oct 12 12:45:58 MDT 2025
deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
Enter 'help' for information
ukc> disable uftdi*
356 uftdi* disabled
ukc> disable uftdi0
ukc> disable uftdi1
ukc> quit
Saving modified kernel.
# reboot
At the boot prompt, typing in
.. code:: bash
boot> boot /bsd.nouftdi
will boot the new kernel with the disabled module.
Afterwards, openFPGALoader will access the development board as a generic USB device.