Hi Roy,
Am 18.11.2016 um 15:25 schrieb Roy Gillotti gillottir@gmail.com:
Is there anything I can test?, I know I did that experiment a few months ago, bumping up the supply voltage and what not. I was seeing an instability while running on 5V.
Ok!
I haven't tried to power up the devboard while limiting the CPU to a lower clock frequency.
I'm also still using an older kernel where the PVR is working properly, so I haven't played with any of the newer kernels yet.
The strategy I am currently trying to follow is to run the EVM at 1.5GHz@5V and find some working setup that does not hang. If necessary with a very old kernel.
If we can manage to find such a config we can try that on the Pyra hardware and see if we still have the problem there. If it is also gone we finally know that there is some hidden instability in modern kernels - although we have no explanation. Then we can look for it and fix the kernel.
If we still have the problem on the Pyra it is very likely a hardware difference which can not be fixed by software changes.
So if you could invest some time to locate a working old (3.8 to 3.12) kernel, that would be of big help. I have tried tag v3.8.13.9-rt20 from git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git but it did hang after "Starting Kernel...". Maybe it was just the console setup or bootargs but I don't know.
BR and thanks, Nikolaus
On Thu, Nov 17, 2016 at 6:59 PM, Michael Mrozek EvilDragon@openpandora.org wrote: Hi,
as Nikolaus is currently working on improving the voltage connections on the CPU board, it came to our mind that the EVM (which we based our design on) also might have some bugs.
Unfortunately, I don't have an EVM here anymore (it's at the touchscreen manufacturers place so they could test the screen), so I can't help, but as I know some here have an EVM and / or an IGEPv5, maybe you can help.
Here are the issues Nikolaus had that occur both on the EVM AND on the Pyra.
- Unstable at 1,5GHz. Crashes under high-load and when doing memtest.
- Doesn't properly reboot after a reset
As far as I know, the instability only happens whn using an 5V adaptor on the EVM (at least I ran it under high-load with a 12V AC adaptor for quite a while). Can someone test and confirm this? Also, does memtest (maybe Nikolaus can provide the compiled binary for that) also crash when using 5V?
The reboot... yes, I've seen that. I remember I always had plug out the power of the EVM completely, otherwise, it never really rebooted.
Has anyone looked into this? Does this still happen or does anyone know why? And if yes, does that happen on the igepV5 as well?
It's interesting that our Pyra boards behave a bit like the EVM when powered with 5V. I hope there's no bug in the power-supply circuit which we cloned into our CPU board.
Thanks for any help here :)
Of course, Nikolaus is welcome to add some comments in case I've forgotten something.
-- Mit freundlichen Grüßen,
Michael Mrozek
OpenPandora GmbH Geschäftsführer: Michael Mrozek
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