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<bobby_>
my A10-OLinuXino-LIME rev. C is not stable at 1008MHz@1.4 V using libjpeg-turbo test, mainline kernel 4.0.0-rc4 and u-boot 2015.01, so I tried ssvb and wens suggestions
<bobby_>
I added 960 MHz@1.4 V in sun4i.dtsi and compiled a new dtb - it works and it is stable
<bobby_>
912MHz@1.35V is also stable
<bobby_>
then I changed dcdc2 voltage in u-boot to 1.45V
<bobby_>
1008MHz@1.45V is stable, 1056MHz@1.45V is not
<bobby_>
btw, how many times should I run cpufreq-ljt-stress-test with result PASSED to conclude that CPU is stable?
<ssvb>
bobby_: nobody knows :-)
<ssvb>
in fact, I would prefer to have some safety headroom instead of running the test for X, Y or Z hours and concluding that everything is alright
<bobby_>
ssvb: because even at 1008MHz@1.4V I had series of 21 successful tests until it failed on the 22nd, .. and then on 25... 28 etc
<ssvb>
yes, exactly
<ssvb>
we also can't be sure that libjpeg-turbo is the most stressing test (there might be some other real workload, which is more likely to fail with improper CPU voltage), and some A10-OLinuXino-LIME boards may be more picky than the others
<ssvb>
bobby_: my A10-OLinuXino-LIME rev. A fails the test with 1008MHz @1.425V after running it long enough
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<bobby_>
ssvb: my results are exactly as sun4i_poorlime, at least for 912, 960, 1008 MHz
<ssvb>
in a geometrical sense, we want to increase the cpufreq voltages, so that the 'blue' line gets placed above the 'cyan' and there is at least 0.025V gap between them to have some safety headroom
<ssvb>
bobby_: have you seen the patches from wens in the mailing list?
<bobby_>
even at "stock" voltages A10 seems to be hotter than A20, I will not risk running cpuburn-a8 on it :)
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<bobby_>
no
<ssvb>
are you subscribed to the linux-sunxi and/or lakml mailing lists?
<ssvb>
arie: thanks, I'll try to have a look at it later
<ssvb>
arie: is this file license clean (maybe recorded by you)?
<arie>
ssvb: yes, I recorded it. Use it anyway you like
<arie>
thanks for your time!
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<sillysnowflake>
does uboot display anything on the screen? i have it installed on my sd card and tried booting that without any linux installed anywhere, but nothing shows up
<bonbons>
sillysnowflake: depends on uboot version, older ones only know serial console
<sillysnowflake>
i got the one from the git repo just a few days ago
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<bonbons>
then it should probably display something (unless improperly configured or your device is not sufficiently supported)
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<ssvb>
sillysnowflake: this also depends on which git repo you have used
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<jero>
talking about uboot, are there framebuffer drivers for the sun4i in uboot ?
<RSpliet>
jero: maybe not the best help, but I verified it working for sun7i... I reckon the display component hardly differs between the various SoCs so good chance of it either working or being easy to get working