Hi,
I have another question about the iMX6,
it is about the TSC emulation .
I have been told that the Pentium TSC could not be accurate enough
for a one of our application that performs high precision data acquisition.
Can we expect a better accuracy with the TSC emulation based
on the ARM timer or not ?
Is this based on the CCNT that is cycle-accurate ?
Thanks
Thierry
Le 23/05/2012 14:32, Gilles Chanteperdrix a écrit :
On 05/23/2012 12:14 PM, Thierry Bultel wrote:
Le 23/05/2012 12:05, Gilles Chanteperdrix a écrit :
On 05/23/2012 11:56 AM, Thierry Bultel wrote:
Hi,
We are looking in a replacement solution for our obsolete
pentium-Celeron calculator.
For many reasons, we would like to switch to the ARM architecture.
The aimed CPU is the iMX6 Quadcore.
Freescale provides a patched 2.6.35 and 2.6.38 kernel that do not have
all the peripherals (the CAN seems to be missing)
and Emtrion, a CPU module manufacturer, say they provide the additional
patches to have the complete BSP.
It is likely a 2.6.35 only, though.
Xenomai for mx6q does not exist for linux 2.6.35. It only exists for
freescale branch for 2.6.38, or 3.0, as a separate set of patches to
apply before and after the Adeos patches for the vanilla kernel. For
further details, see ksrc/arch/arm/patches/README in xenomai 2.6 sources.
Thanks, yes, as I said, I am aware that the very first work for me will
be to get
the non-xenomai 2.6.38 kernel fully working
Furthermore, we have some stability issues with Xenomai for mx6q with
3.0, the issues looking a lot like an issue with cache. We would ned to
recheck 2.6.38 to see if it had the same issues, but I would bet it does.
Actually my concern was to know if there were currently developments
on that CPU. The fact that they are remaining bugs is not a concern,
as long as they would be likely be corrected in the coming months.
Do these bugs also exist on the mx6 single core ?
I was unable to reproduce the cache issue on single core, but I have not
tested enough to be absolutely sure that we do not have it. The issue is
sufficiently rare that it may go unnoticed during one test, and appear
during the next.
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