Am Sat, 30 Jul 2016 20:02:14 +0200 hat "H. Nikolaus Schaller" hns@goldelico.com geschrieben:
Hi,
The CPU board I am running these test on has additional wires which allow to measure the voltages VDD_MPU, VDD_CORE, VDD_DDR3, VDD_MM, 1V8, VSYS.
This might be a good idea. Maybe the combination of Palmas and the charger / battery chip causes an issue here and the voltage isn't increased for some reason.
What you could also test would be setting 1GHz to run with a higher voltage and measure whether the voltage REALLY is increased. This way, the unit doesn't crash.
Another thing I'd like to remind here: 1,5GHz work fine (even with full load) with the EVM and the iGEPV5 board. So it probably is something that's different between those and our boards.
* Are there differences in the board files that could cause our CPU to misbehave?
* Is there a difference in our hardware setup that could lead to that? We got different RAM, a different quartz, different power setup (we don't have a simple AC like the devboards, but a battery / charger circuit)
Anyways, please all kernel developers think about potential kernel issues (scheduling, SMP, locking, interrupts, I&D-caches) that might lead to such a behaviour. And potential tests (I can add printk etc. where needed).