Open JaapKeuter opened 9 years ago
Ignore my previous posts. Some more tests on my Pi 2 show that I need 2 overvolt (I guess you shouldn't set it to 0) with that overclock setting otherwise I get random lockups and I always seem to get some errors in memtester, no matter the SDRAM setting.
From my tests, this config seem to work fine fine for me: 1000MHz ARM, 500MHz core, 480MHz SDRAM, 2 overvolt Changing SDRAM to 490 or more produces errors.
EDIT: After running it more times I could actually reproduce the errors even with 480MHz, although it's rarer than 490, but it still happens...
So, you say: set overvolt to 2, i.s.o. 0? Even though that's not what is in the test results, I've been running my Pi2 at the 2 overvolt setting 24/7 for well over two months now without problems, so maybe it is the right setting.
Btw: Maybe you should test with 483 MHz i.s.o. 480 MHz. Maybe that matches better with the SoC internals.
What does "i.s.o" means? Anyway, overclock 2 is fine. I just had some random lockups due to the SDRAM setting, which also produces errors in memtester. According to various forum posts I could read on raspberry official forum, other people have the same issue as well. I had to set it to 460 or 470 MHz (can't remember which one, can't check right now) to not have any errors.
i.s.o.= instead of By the way, now you say 'overclock 2 is fine', I guess you meant to say 'overvolt 2 is fine'. Maybe an additional setting should be defined to set a lower frequency.
Yes sorry, I meant overvolt 2. Anyway there has been no commit since January, I'm not sure if this will get merged anytime soon...
Pi2 overclock preset SDRAM speed is INCREDIBLY aggressive. this might not be a problem for most applications but for games/emulation it'll quite likely cause a Pi2 to crash. 483 is the highest I can get to.
First off there is no reset to default, so adding a Pi2_None option to go back to those.
Second, furhter research(*) has shown that slightly lower settings do not cause stabilty problems versus the current overclock settings. Renaming this modest overclock settings due to lack of overvoltage.
(*) http://linuxonflash.blogspot.nl/2015/02/a-look-at-raspberry- pi-2-performance.html