* Grazvydas Ignotas notasas@gmail.com [180531 08:38]:
On Wed, May 30, 2018 at 5:42 PM, Tony Lindgren tony@atomide.com wrote:
- Grazvydas Ignotas notasas@gmail.com [180530 08:41]:
Hi,
On Tue, May 29, 2018 at 7:10 PM, Tony Lindgren tony@atomide.com wrote:
Note that we still can have pyra hang running two instances of memtester 1500M for about 10 minutes on bare CPU boards with no heat sink connected. The boards now boot reliably after that though, so presumably the pyra heat sink will solve this issue.
I've tried these patches on my 4g board from last year (also with double memtesters) and although it did not crash, memtester detected errors after running for about an hour. My board is "lucky" that it boots even with old code, but it used to crash in around 20 minutes or so. I haven't seen it crash with 1.37V with the old code, although it might just have been luck. I'll do some more testing later (don't want to leave it unattended while I'm at work).
Yeah worth testing for sure.
I've tested 2 more scenarios: new timings, 1.37V: memtester errors after ~1h old timings, 1.37: memtester errors after 4h+ hours
Could just be randomness or heat related, second test was done in the evening under slightly lower room temperature.
Hmm OK. What CPU speed are you running it at?
Do you have a heat sink attached? I recall the last time I played with this I was able to run two instances of memtester 1500M for longer periods of time only if I added a proper heatsink and a fan.
No heatsink, it's a cased unit. How do you cool the OMAP when it's inside the "sandwich"? Are you simply cooling the "empty" side of CPU board?
Looking at your memtester times sounds like the case is working well as a heat sink :)
I had some PC heat sink tape around that I put on the empty top side of the CPU board, then dropped four tiny heatsinks and two tiny PC 12V fans on that :)
I can still get memtester errors after about 10 minutes, but I noticed I now have the fans hooked to 5V power supply. I need to test with fans running at 10V or something higher as I think that's what I used the last time to be able to run two instances of memtester 1500M for longer periods of time.
Regards,
Tony