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.
Am Mon, 2 Oct 2017 06:45:48 -0700 hat Tony Lindgren <tony@atomide.com
geschrieben:
Yes, but without updated kernel... so I guess I was really running at 1.35V with DLL off (if the kernel lowered the voltage).
I need to test that.
One thing to notice: I didn't have ANY issues with rebooting. It booted fine every time I tried, no failure, regardless how warm it was.
If U-Boot starts with 1.5V, then hardware levelling is done with 1.5V, right? The kernel switches to 1.35V after that... maybe that's the trick?
I'll try with various boards and combinations!
- Michael Mrozek EvilDragon@openpandora.org [171001 16:25]:
Tony, as it worked for you with either 1.39V (or was it 1.42V?) OR DLL off, maybe both have a positive effect?
What about a build with 1.39V with DLL off?
Could you please provide a build with that?
Sounds like you got that from notaz already, see my other reply though for things to test.
Regards,
Tony