On Sat, Apr 14, 2018 at 1:18 PM, Steven Vanden Branden
<stevenvandenbrandenst...@gmail.com> wrote:
>> Hi,
>>
>>
>> That means nothing to me, I'm guessing it's a cheap AllWinner based
>> device, do you have any more details? Are you using a Fedora u-boot or
>> your own? If Fedora what's it called? What Fedora image are you using?
>
> I is indeed a cheap cortex A10 Alwinner tablet, with 1Gb ram.
> I started from image 
> https://download.fedoraproject.org/pub/fedora/linux/releases/27/Spins/armhfp/images/Fedora-Xfce-armhfp-27-1.6-sda.raw.xz
> and used the bootloader for A10-OLinuXino-Lime in the arm-imamge-installer, 
> later on i replaced it with a bootloader compiled for the sun4i-a10-inet1 
> target, compiled from the uboot repo.

For reference I enabled a bunch of these devices in the Fedora u-boot
builds. I've not yet set them up in arm-image-installer but you can
just symlink a device to the AllWinner SoC there so it's quite
straight forward.

> I update by sudo dnf update and everything still works except for the newer 
> kernel.
>
> Also its a inet 10F rev 03 model chipset.
>
>>
>> Touch screen is no real surprise if it's an AllWinner based tablet,
>> they change them constantly based on cost and availability.
>>
> the touchscreen is DPT 300-N3765A-C00, from the dpt group, i will see later 
> if i can get the driver information from the android fex file, but the fex 
> files have multiple touchscreens defined, so i will have to verify which one 
> later.
>
>>
>> If one 4.13 works it's not surprising others do, what about 4.14.x
>>
>>
> i will try the 4.14 kernel from koji as well.
>
>> Can you some how grab the output up until it goes blank, I suspect
>> that last output might give us some idea.
>>
> the latest output is:
>
> starting kernel..
> then a black screen with the pinguin only (from uboot?), then that also 
> disappears, it seems the back-light is still on though, until i reset the 
> tablet,
> could it be that the load address of the kernel is wrong (kernel  size got 
> bigger?).
>
>> What about a Fedora 4.16.2 (built yesterday) kernel? Unfortunately we
>> can't help with custom built kernels, it's almost impossible to remote
>> debug the Fedora ones, custom is the never step of impossible.
>>
> I understand, i will try with the that koji kernel as well.
>>
>> Kernels can always be found in koji to download:
>> https://koji.fedoraproject.org/koji/packageinfo?packageID=8
>> You'll find every thing to the latest 4.17 linus snapshot there.
>>
>>
>> Sadly there's no MakeItWork kernel command line option, it's a matter
>> of getting debug and trying to work out what went wrong and why. We
>> don't explicitly support these devices due to the lack of ease of
>> supporting them as you're finding out, but we don't do anything to
>> actively stop them working, it's very much a best effort, I suspect
>> there's something upstream that has regressed, the question is working
>> out what, and the last of that early boot output will be the best spot
>> to start.
>>
>> Peter
>
> Thanks for all the info, I have spotted what i think is the serial 
> connectors, and i will try tomorrow to get serial working so i can give a 
> better log (of the koji kernel) boot sequence.
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