USB workaround

Hardware related problems and workarounds

Re: USB workaround

Postby ESI » Tue Oct 14, 2014 11:09 pm

after many set backs (32bit arm-gcc on 64bit system, ISE under Linux), I managed to build a FSBL with ISE 14.7 which boots. Fortunately I can try and error with FSBLs because I have a JTAG connection (don't try this at home, if you cannot connect JTAG to reflash). But I did not yet patch the FSBL, because I ran out of time again. I will try and report, if I find time again, sorry....
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Re: USB workaround

Postby Sean S » Mon Nov 10, 2014 12:59 pm

So, it's has been many months since Adapteva finally admited that there was a problem... and many more months have gone by. What is the plan to fix this USB or give people their money back!?

:cry: :cry: :cry:
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Re: USB workaround

Postby Len » Mon Nov 17, 2014 5:29 pm

I haven't experienced this problem. Does it only occur if you are using the USB next to the power connecter? I have a powered Macally hub plugged into the one next to the HDMI and until I saw this thread I didn't know there was a problem. Both 2A wall warts are plugged into a switchable power cord. I use a wireless Logitech k330 keyboard and mouse and transfer files from USB sticks. My board is 7020 based from the kickstarter batch.
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Re: USB workaround

Postby ajtravis » Tue Nov 18, 2014 10:21 am

Len wrote:I haven't experienced this problem. Does it only occur if you are using the USB next to the power connecter? I have a powered Macally hub plugged into the one next to the HDMI and until I saw this thread I didn't know there was a problem. Both 2A wall warts are plugged into a switchable power cord. I use a wireless Logitech k330 keyboard and mouse and transfer files from USB sticks. My board is 7020 based from the kickstarter batch.

Hi, Len.

USB is a problem for a significant minority of Parallella 'Desktop' users (including me) and Andreas requested that people report USB problems consistently to help Adapteva solve the problem http://forums.parallella.org/viewtopic.php?f=50&t=1650.

The USB connector next to the power connector is only there as an alternative option to supply the board with power: It does not function as a USB interface. As Sean said, it has been quite a while since Adapteva acknowledged that there is a USB problem with Parallella and, at least in some cases, they have issued an RMA for the boards affected. To be fair to Adapteva, they have had difficulty reproducing the USB problem even on a board I returned that was failing to initialise the USB PHY 90% of the time in 60 tests of each board under different configurations of PSU, USB hub and Linux kernel:

Code: Select all
Successful initialisation of Parallella USB PHY

Serial no. 0007861 0007834 0009068 0007858 All
SKU        A101020 A101020 A101020 A101020
overall    37%     10%     27%     25%     25%

Bye,

Tony.
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Re: USB workaround

Postby frostybeard » Wed Nov 26, 2014 8:05 am

So, it's been about half a year. Will there be a patch? Or an update?
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Re: USB workaround

Postby Sean S » Fri Nov 28, 2014 1:01 pm

I think we can forget about this being fixed. It took ages to acknowledge that there was a problem and there is never a response as to when this will be fixed. Save yourself the frustration and throw the board in the bin and never buy anything from these guys again. Clearly they don't appreciate their loyal backers.
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Re: USB workaround

Postby ajtravis » Fri Nov 28, 2014 1:11 pm

Sean S wrote:I think we can forget about this being fixed. It took ages to acknowledge that there was a problem and there is never a response as to when this will be fixed. Save yourself the frustration and throw the board in the bin and never buy anything from these guys again. Clearly they don't appreciate their loyal backers.

Hi, Sean.

I think that's a bit harsh - I dug deep into my pockets to buy a 'cluster' kit and I've enjoyed getting it to work. It's really only the USB that's a problem - I'm not happy about it, but I don't think it's fair to write off the entire project just because the USB looks like a case of marginal design. We all make mistakes, but few of us are subject to this type of public scrutiny. However, I do agree with you that Adapteva could be a bit more proactive about telling us what they are doing to fix the now well established USB bug in the Parallella design. As I've said before, I think this is the Achilles heel of Parallella as a 'desktop' computer.

Looking forward to Fred publishing details his USB fix soon :-)

Bye,

Tony.
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Re: USB workaround

Postby frostybeard » Sun Nov 30, 2014 10:13 pm

Anything at all would be appreciated.

Joerg, if you want to share the sources of your FSBL, I am sure someone here could follow up on it. (I have zilch experience with Xilinx FSBLs)

FSBL= first stage bootloader, a Xilinx-specific bootloader.
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Re: USB workaround

Postby aolofsson » Sun Nov 30, 2014 11:28 pm

In the latest version of Vivado, supposedly the first stage boot loader has been GPL'ed! Got it from a good source, but have yet to see the code with my own eyes.
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Re: USB workaround

Postby timhavens » Wed Dec 03, 2014 2:28 am

BUMP
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