* Michael Mrozek EvilDragon@openpandora.org [171003 09:32]:
On Di, 2017-10-03 at 12:27 +0200, Michael Mrozek wrote:
Hi,
indeed, whereas U-Boot sets it to 1.5V, the kernel switches back to 1.35V: [ 2.780669] smps6: Bringing 1500000uV into 1350000-1350000uV
So my Pyra was running over 24 hours with 4GB RAM at 1.35V (until I shut it down).
It was just idling though, so no extensive tests, and it still was running with DLL off (haven't done any other test yet).
But as it was booting up reliably.
Switching the memory voltage after booting can be glitchy and there could be issues coming up from suspend etc. So best to stick to whatever voltage makes the voltage measured at the memory chips be the correct 1.35V.
And I'd leave out the DLL off hack too because we're running things outside the specs. If it's really the voltage drop then it should not be needed. And there might be also some performance issues without the DLL.
Regards,
Tony