Hi, On Wed, 16 Dec 2015 10:11:38 +0100 Hans de Goede <[email protected]> wrote:
> Hi, > > On 16-12-15 08:35, Siarhei Siamashka wrote: > > On Thu, 10 Dec 2015 04:31:05 -0800 (PST) > > Thomas Kaiser <[email protected]> wrote: > > > >> Hi, > >> > >> Hans de Goede wrote: > >>> > >>> ? if I understand things correctly your patch make lima-memtester pass > >>> at 672 MHz (which is our current configured speed) on both your > >>> and Siarhei's boards, to me that seems that it fixes things. > >>> > >> > >> A few more boards were tested but 672 MHz seem still questionable: > >> > >> http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit > >> http://www.orangepi.org/orangepibbsen/forum.php?mod=redirect&goto=findpost&ptid=257&pid=7465 > >> > > > > Yes, the 672 MHz DRAM clock speed does not look like a good choice > > for Orange Pi PC. Either we find better delays & zq settings and > > improve reliability, or the DRAM clock speed needs to be decreased > > (also ensuring a little bit of safety headroom). > > > >> (the latter interesting since he uses a huge 35x35x25mm heatsink that > >> covers also DRAM) > > > > Some outliers are always possible and we have only one sample, which > > can be clocked somewhat higher than the others. It is hard to make any > > conclusions with the available data and the heatsink may be unrelated. > > > > Unless we get more test results in a few days which radically change > > the statistics, probably using 624 MHz for DRAM on Orange Pi PC would > > be reasonable. > > Reducing the DRAM speed to 624 seems like a good idea to me, can someone > send me a patch for this please? We still have a hope to collect more statistics at: http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit The Orange Pi PC DRAM clock speed needs to be adjusted before the U-Boot v2016.01 release, and we still have to decide what would be the best default. But the time is running out. So if anyone wants to do a useful contribution by submitting lima-memtester results from his/her Orange Pi PC board, then now is the last chance. Steven, if you have access to many Orange Pi PC boards, maybe you could try to run some tests on them too? -- Best regards, Siarhei Siamashka -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
