On 09/04/2014 10:00 AM, Denys Dmytriyenko wrote:
On Thu, Sep 04, 2014 at 02:50:03PM +0000, Mikhail Zakharov wrote:
On Wed, Sep 3, 2014 at 8:59 PM, Peter A. Bigot <[email protected]> wrote:
One anomaly I've found is the CPU frequency range. On debian we have:
debian@beaglebone:~$ cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
300000 600000 800000 1000000
while on OE we have:
root@beaglebone:~# cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
300000 600000 720000 800000
Stock yocto-bsp is missing a few things that can be found in Robert
Nelson's patchset for 3.14 linux kernel.
There are lots of other functionality that is missing from yocto-bsp
kernel for Beaglebone. I suggest you take at the following repos and
scavenge for what you need :P
First of all, this is meta-ti mailing list for the corresponding BSP. That's
what Peter was asking for, comparing to Robert's Debian and Yocto reference
BSPs, not the other way around.
Second, Yocto reference BSP is that way for a reason - it's a reference BSP
done with pure mainline kernel and u-boot components w/o any patching on top.
That's its entire purpose. For anything else special, including performance
tweaks, there are other BSPs available. If there is an issue with performance
in meta-ti, we'll investigate it and try to match with Robert's BSP.
Yes, at this time meta-ti's BSP performs as well as I've seen any
OE-based system, and gets several things right that meta-yocto-bsp does
not (and one thing wrong that meta-yocto-bsp gets right, I think; still
investigating, will follow-up when I'm sure).
I've also verified that performance with a native gcc 4.9.1 build on
BeagleBone with hard float is poor, so it's not due to the way OE builds
gcc. I have several competing hypotheses to test.
But I'm still looking for a way to set the CPU frequency to the higher
values supported on Beaglebone Black. I had hoped meta-ti's would be
able to do that, since it has bone vs boneblack device trees and u-boot
detection.
Any hints where to look for clock settings?
Peter
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