<speakman>
Hi folks. Anyone tried dual LVDS links for LCD display?
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<oliv3r>
so who wants to know my first results
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<oliv3r>
after removing the heatsinks (we put on for safety mostly, as some countries do get quite warm where wher ship our product to) all of my 6 samples crash within 24 hours. raising the dram freq. to 504 makes it crash within an hour
<oliv3r>
running it at 456 now to go for the next 24 hrs
<oliv3r>
also temperature (obviously) has a very high invluence
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<ssvb>
oliv3r: what makes you think that the temperature has any significant influence?
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<ssvb>
we are using the DDR3 chips at a much lower clock speeds than they are designed to be used with
<ssvb>
nearly all the DDR3 chips in use are DDR3-1333 or even DDR3-1600, have a look at https://linux-sunxi.org/DDR3
<oliv3r>
504 with a coolspray maes it work
<oliv3r>
(one board failed to almost boot with lima-memtester in rc.local
<plaes>
coolspray?
<oliv3r>
with coldspray it did work (to change the bootloader)
<oliv3r>
yeah
<oliv3r>
also
<oliv3r>
our heating was broke monday
<oliv3r>
and all boards more or less worked
<oliv3r>
wed. it was fixed and they started crashing again :)
<ssvb>
just compare the "green" areas in the tables at 648MHz DRAM clock speed
<ssvb>
of course, if your tpr3 settings (and other parameters) happen to be exactly on the edge of the green area, then the boot time temperature does matter really a lot
<oliv3r>
yeah i remmeber that picture :)
<oliv3r>
but never noticed the 'cold start'
<oliv3r>
but wait
<oliv3r>
if i cold start it, my settings will be more tight and thus it has a bigger chance of making it?
<ssvb>
no, your settings will be just different
<oliv3r>
but keeping it cold also means i can keep it going
<oliv3r>
ah right
<oliv3r>
but my EE guy here also says 'yeah bandwidth, clocking and temperature are all related'
<jemk>
ssvb: btw, your zq values are only different by +1 between cold and normal, so either there is something else or even such a small difference has a huge effect
<ssvb>
it shows how the calibrated impedance settings differ between cold start and hot reboot
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<ssvb>
jemk: normally it does not have any significant effect, only the edge case is problematic
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<oliv3r>
anyway, I will let 456 run for a day or so
<oliv3r>
and see if i can get it to pass there
<oliv3r>
and will keep going down and see if it keeps working
<oliv3r>
i don't really have control over the ambient temperature
<oliv3r>
but it atleast confirms the 384 MHz should in theory be stable
<oliv3r>
but my estimate is, 408 will be fine as well
<ssvb>
jemk: on this particular pcduino2 board with hynix ddr3, the default tpr3 value 0x000000 happens to be exactly on the edge, that's why the reliability is so unpredictable between reboots
<jemk>
ssvb: i meant the 648 cubietruck case, there +1 makes the green area much bigger
<ssvb>
jemk: in the case of the Cubietruck, the 648MHz DRAM clock is the extreme top speed configuration, and it is quite understandable that it is sensitive to even minor variations in the config
<ssvb>
jemk: the 600MHz setup is more reliable
<ssvb>
oliv3r: please try to record the dram_tpr3 value for each of these test runs on every board
<ssvb>
oliv3r: in fact, a complete a10-meminfo report is even better
<ssvb>
oliv3r: I mean, the a10-meminfo tool from my repository
<oliv3r>
ssvb: okay; you want the failing cases as well? 504 mhz will be hard to capture :)
<ssvb>
oliv3r: you just need to run a10-meminfo before lima-memtester :-)
<oliv3r>
i can put it before in rc.local i suppose :p
<oliv3r>
but then i have to make a new image
<oliv3r>
hmm
<oliv3r>
there i do a10-memtester > /boot/meminfo to my sd card
<oliv3r>
so if it fails, i can manually still get hte data
<oliv3r>
i'll move my sheet around a bit to store this data
<ssvb>
also do explicit 'sync' before starting lima-memtester
<ssvb>
BTW, I had a proposal to make a more automated tool, with reporting results to a server in the Internet rather than storing them on a local SD card
<ssvb>
if your company or somebody else has a little bit of budget to sponsor this work, then it can be done :)
<ssvb>
I would do it for free earlier, but right now I have already wasted too much time on this DRAM reliability problem
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<oliv3r>
ssvb: i agree
<oliv3r>
ssvb: unfortunatly, we are not the right people to do this I don't think
<oliv3r>
technically, olimex should have sponsored the work
<oliv3r>
as it's their boards that are in question
<oliv3r>
it's costing us money now, to fix their problem; but then again, they easily say 'we don't even use 480 mhz'
<ssvb>
it's difficult to 'sell' reliability, because the vast majority of people don't even realize that they have any kind of a problem until it blows up in their face in a very obvious way
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<ssvb>
yeah, I understand that there is nobody to sponsor this work (or even use it for free!), that's why I did not bother to even try implementing similar tools for H3 and other SoCs
<oliv3r>
ssvb: i do agree that there is a problem
<oliv3r>
but a) allwinner should have created the tools as part of their sdk
<oliv3r>
which meant implementors would likley to use them as part of their certification trajectory etc
<oliv3r>
and then b) implementors should want/use the tool
<oliv3r>
users (e.g. 'us') should not need such a tool, unless we go overclocking things to get better performance
<oliv3r>
we thought we bought stable boards with stable configs
<oliv3r>
we did not realize 'stable' was not really stable :p
<ssvb>
well, I did notify the U-Boot board maintainers (Hans) and Olimex (Tsvetan) at least several times, it was their choice to do exactly nothing
<ssvb>
all this information is on the Internet :)
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<oliv3r>
ssvb: i know i know
<oliv3r>
ssvb: which is why i found hans's reply kinda funny
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<oliv3r>
but ssvb; such is life
<oliv3r>
ssvb: if we all did proper things
<oliv3r>
then sunxi didn' thave to exist as allwinner do it all properly :)
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<oliv3r>
ssvb: but oth; it gives us purpose :p
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<ssvb>
right now I really need to focus on things that bring money, rather than some abstract purpose
<oliv3r>
ssvb: i totally understan
<oliv3r>
i guess it's our curse, as 'free software engineers'
<oliv3r>
pun on free
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<wens>
mripard: any idea what SCU means in simple-scu-card?
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<KotCzarny>
oliv3r: aren't your boards going to be inside quite warm environment?
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<mripard>
wens: no idea
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<mripard>
I tend to stay away of anything called simple
<mripard>
it's usually too complicated
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<ptx0>
trying to compile linux 4.9 mainline on a banana pro, i've got it compiled and installed with the proper .dtb and i've run mkimage on the .cmd file to generate the .scr
<ptx0>
i've got it to the point where it loads sunxi-rtc which sets the date to 1970s but then it doesn't progress further