<Seppoz>
do i need any changes from A10 to A20 in display settings?
<Seppoz>
my display works in A10, same kernel only changed to sun7i display wont work
<Seppoz>
also is the same uboot that works for a10 suppose to work for a20 or not?
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<lukas2511>
Seppoz: i guess you need different uboot
<lukas2511>
and you have to provide the correct script.bin, and your kernel has to be build for sun7i/A20
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<Seppoz>
lukas2511: the kernel is built for sun7i, i did NOT change the script.bin, and i do have a dedicated sun7i uboot built
<Seppoz>
yet i dont understand why my lcd wont work
<Seppoz>
does uboot in some way touch the lcd settings? i do have different uboot sources for a10 and a20
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<Seppoz>
is the lcd code the same for a10 and a20 cpu?
<Seppoz>
also on A20 i dont have /sys/class/graphics/fbcon which i do have in A10
<ssvb>
Seppoz: is it exactly the same board with just A20 instead of A10?
<Seppoz>
yes
<Seppoz>
100% identical
<Seppoz>
i made kernel for A10
<Seppoz>
then went into kernel config and changed to sun7i
<Seppoz>
compiled
<Seppoz>
and put on with new uboot
<Seppoz>
everything beside the lcd is working fine
<ssvb>
any error messages in the dmesg log?
<Seppoz>
nope
<Seppoz>
also i do have fbcon, was my mistake eralyer
<Seppoz>
its really wired
<Seppoz>
is there any required tweaks on a20 and lcd?
<Seppoz>
like different timing setting or so
<ssvb>
afaik this should be configured in script.bin, also check the kernel cmdline and /proc/config.gz between your a10 and a20 setups
<Seppoz>
also it looks like its not used at all you know
<Seppoz>
if the settings would be wrong
<Seppoz>
it would flicker or whatever
<Seppoz>
or show crap
<ssvb>
btw, why did you have to use different u-boot sources?
<Seppoz>
but it only turns black and fades to white
<Seppoz>
its one thing i do not yet understand, has something to do with ram
<Seppoz>
one thing i also dont understand is why uboot doesnt detect the 1gb ram on a20
<Seppoz>
eventho i did set the ram settings and they are used in the dram file
<Seppoz>
to 1gb
<Seppoz>
but thats another thing
<Seppoz>
ldc is mor eimportaint
<ssvb>
are you using the same dram settings for a10 and a20?
<Seppoz>
yes
<ssvb>
a20 has an extra address line, which is missing on a10, this could potentially make a difference
<Seppoz>
but all that has nothing to do with lcd
<Seppoz>
what do you mean
<Seppoz>
on extra address line?
<lukas2511>
it turns black and fades to white on reboot?
<Seppoz>
sec
<Seppoz>
well hard to describe but yes
<lukas2511>
well that sounds like that there is something happening. at this point i would try to figure out if the display pins are really connected to cpu, to be sure that it's not an hardware issue
<Seppoz>
allready did and tried lcd on a10 board
<Seppoz>
no issues there
<Seppoz>
trying more recent kernel now
<lukas2511>
well but this is a different board, or did you resolder the a20 on the a10 board? may have bad contacts
<Seppoz>
is there any tweaks required on a20 when using lcd?
<lukas2511>
mh
<Seppoz>
it was FP tested and we didnt find any difference between those 2 boards
<Seppoz>
unless there is something wrong in the coreboard
<Seppoz>
which is kind of hard to find out
<lukas2511>
i connected lvds display, figured out timing on scriptfile (was a bit off from datasheet, but with wrong values i got at least something), put "console=tty0" into cmdline, and build sunxi lcd module directly into kernel (not as module)
<lukas2511>
that worked for me on a20
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<Seppoz>
its ttl
<lukas2511>
you could toggle the lcd lines and see if there is actually output on the connector
<Seppoz>
but yea thats what i did
<lukas2511>
i did that just to figure out that i basically held the manual the wrong way m)
<Seppoz>
A10 and a20 pins for lcd are 100% compatible right
<Seppoz>
and also same naming and so on
<ssvb>
Seppoz: the A20 datasheet documents the AA4 pin as SA15 (an address line), but A10 datasheet documents it as SCS1 (chip select)
<ssvb>
Seppoz: A10 only supports up to 4096 chip density for dram, and A20 supports up to 8192
<ssvb>
Seppoz: depending on your dram settings (and the actual dram chips), this could probably make a difference
<Seppoz>
dont see any difference in lcd stuff there
<ssvb>
lukas2511: thanks for the link, it confirms different DDR3 wiring
<ssvb>
Seppoz: anyway, I know a lot more about dram than about lcd :)
<Seppoz>
well so why does a20 doesnt detect my 1gb? let me show you the settings
<lukas2511>
Seppoz: https://github.com/lukas2511/a20-lcd-and-buildroot-test here is my a20 lcd test buildroot stuff. compiling this builds a small linux system that basically enables console on lcd. maybe take a look at kernel config and script.fex, see if there are any major differences
<lukas2511>
(this is for olinuxino a20 micro, you may have to change a few things for your board)
<ssvb>
Seppoz: sure, you can pastebin the dram settings somewhere
<Seppoz>
id really want to fix lcd first wich is a pita
<ssvb>
Seppoz: if your impedance settings are bad, then it may degrade reliability and reduce the maximum dram clock speed, but nothing like wrong size detection
<Seppoz>
is spl setting up dram?
<ssvb>
yes
<Seppoz>
ok
<Seppoz>
lcd result is the same also on new kernel
<ssvb>
does it even try to do something? is the lcd kernel module compiled-in/loaded?
<Seppoz>
yea all that seems irght
<Seppoz>
even if i echo a bmp into the fb
<Seppoz>
it dont care
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<Seppoz>
whell i guess i have to scope the pins tomorrow
<Seppoz>
and see if the clocks and stuff are there
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<quitte>
Hi. I guess it's time I slowly emerged out of hiding.
<quitte>
sorry
<quitte>
Has anyone gotten the AP6210 to work? It's finding the available networks just fine here. but when I try connecting nothing happens.
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<Seppoz>
anyone here have experience with olimex A20 and 7" lcd?
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