What is the highest usable DRAM clock speed for you?
552
27.27%
6
564
0%
0
576
13.64%
3
588
4.55%
1
600
4.55%
1
612
9.09%
2
624
40.91%
9
22 vote(s)
* You voted for this item. [Show Results]

[Volunteer needed]Too high DRAM clock speed MAY be causing you random crashes/freezes
(03-24-2021, 04:55 AM)eugenr Wrote:
(03-24-2021, 03:09 AM)Narvod Wrote: Hi,

I'm running Mobian (so default is 552Hz, right?), and although it is pretty stable, I still have random crashes from time to time. So I would like to try a different dram clockspeed to see if it can get even more stable !

Phoc 0.6 (part of Phosh) and older (?) is known to crash often. That's the current on my Mobian. It seems to be more stable with phoc version 0.7:

https://forums.puri.sm/t/multi-poll-bug-...za/12724/5
OK, I'll wait then  Smile But I had those crashes with plasma mobile and lomiri with ubports in the past as well. I know every OS is in beta stage so I don't really mind, I just don't want to have a worse user experience than necessary if a fix is already availaible. I'll keep the underclocking possibility in mind if it doesn't change in the future I suppose
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As a note, Manjaro ARM builds and packages a few variants of U-Boot for the PinePhone, which allow different DRAM frequencies (492, 528, 552, 592 and 624 MHz) to be easily tried out.  If you're a Manjaro ARM user, just write the desired variant of the U-Boot to your boot device, reboot and test, with no need to search around for an appropriate U-Boot image.
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Mine will error even at 492MHz. I must have a very bad sample.
https://forum.pine64.org/showthread.php?...2#pid94082
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I suspect most people here, who have unstable devices at normal or higher RAM speeds are having the same issue I am having.

It was solved with a kernel patch from @smaeul
https://forum.pine64.org/showthread.php?...7#pid94707

What was once unstable at 492MHz (or any RAM speed) is now running stock 552MHz without crashing, on a patched kernel.
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Arch Linux Arm has released linux-pine64-5.12.4-1 kernel which has the patch.

I am running it at 624MHz RAM speed on a device that would previously hang at 492MHz.

----------
Manjaro has released a kernel with the patch based on https://github.com/megous/linux/releases...10519-1214
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This should put an end to a longstanding issue that affected many devices.  It's awesome! Smile

After some more testing, we could probably remove some or all of the PinePhone U-Boot variants built and packaged by Manjaro ARM, which allow different DRAM frequencies to be selected.
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