(03-06-2016, 02:26 PM)janjwerner Wrote: @TL
Do you have any suggestions about feeding 5V through Euler extension pins? I would expect that it should be able to handle more than 1.9A?
Just plug in, Euler bus connector can handle more than 1.9A. Please watch out the polarity, reverse may fry the board.
(03-06-2016, 02:34 PM)longsleep Wrote: Trip cooling points with my current U-Boot builds are as follows: 65, 80, 90, 95 °C
2 cores are disabled when cooling state 5 is reached and ultimatively 3 cores are disabled in cooling state 6. The cooling tables are optimized to avoid loosing CPU cores on high load.
A heat sink is absolutely required to use all 4 cores with high frequency.
See https://github.com/longsleep/build-pine6...09bea2c251 for the commit and https://github.com/longsleep/build-pine64-image/pull/3 for the discussion and a lot of background information about benchmarking and thermal throttling.
TL;DR: get a heat sink when you want to use Linux and have the Pine do anything which utilizes multiple cores to avoid thermal throttling in normal environments.
@longsleep, thanks on the heads up. I am currently working with one heatsink vendor and design a low profile but effective heathink for the situation where the board been pushed into performance situation like all 4 cores in full swing.