Unable to flash ecpix5 about openfpgaloader HOT 10 OPEN

Hi,
I have tried to load and flash bitstream on ecpix5 successfully.
One thing strange here: ecpix5 has a ft2232h not a ft4232.

Anyway: errors reported are produces at libftdi/libusb level, try to change your USB cable or (I see you uses a *VMWARE VM) trying first a direct access (msys2 package): sometime USB is unstable with a virtual machine (and if your VM report a ft4232 instead of a ft2232 maybe communication between libftdi and device is broken/bad).

from openfpgaloader.

Thanks for your reply.

I have just tried on a non-VM system (Ubuntu 22.04) with a different cable and it still shows the same errors. And my ECPIX definitely has a FT4232 - I can see the markings on the IC directly.

from openfpgaloader.

It's really weird: most of the time I see this type of error it's related to hardware... Could you try to reduce frequency?

For FT4232 vs FT2232 it's interesting, @lambdaconcept docs shows an FT2232 but maybe your board is a new release with a different cable.

from openfpgaloader.

You use sudo to run openFPGALoader could you try:

• switching to root (sudo /bin/bash) or
• following this page to have access right as simple user

I don't remember exactly but I have already seen issue when using sudo

from openfpgaloader.

Yes, I was just trying sudo to try to see if there were any permissions issues. It does the same thing with non-sudo. My board is very recent, so I believe it is a new revision. Are there any other working boards that use an FT4232?

from openfpgaloader.

Ok, interesting update. If I connect the board and try to flash a bitfile at 6MHz, not only do the errors come up but the device de-enumerates...

However, at 1MHz it works fine. Even more confusingly, after I flash it with 1MHz, I can then run the command again at 6MHz and it works fine... I can also flash it at 30MHz as long as I flash it with 1MHz first.

Not quite sure what to make of this.

from openfpgaloader.

Yes really interesting thing!
I have recently used a board with a ft4232 without noticing something like this -> I have to install an ubuntu (22.04) with docker to test if I'm able to reproduce this issue, and to see if it's openFPGALoader related or a regression somewhere between libftdi and libusb.

from openfpgaloader.

So I have been playing with this a bit because I figured like you that it was a hardware problem. It behaved the same with multiple different cables on multiple PCs. Just on a whim I tried unplugging and plugging the cable on the device side ~50 times - and this seems to have fixed it! I guess there was maybe some flux or debris inside the connector from manufacturing. Sorry, I probably should have checked this under the microscope or something earlier. I'm happy for you to close this, but perhaps this is a good opportunity to add a new board or something for the "R03" version of the ECPIX5 because it has the FT4232?

from openfpgaloader.

Great news! Thanks!
Yes sometime a simple debris may produces wrong behaviour :)
Yes. It make sense to add a new entry to this new ECPIX5's revision.
Thanks!

from openfpgaloader.

I have pushed a new board definition for R03 variant.

Thanks again

from openfpgaloader.