On 04/13/2018 02:34 AM, Peter Robinson wrote:
> Hi,
>> i have a inet 3f tablet (pov protab 255xxl) and managed to get fedora 27 
>> running on the board with a inet1 dtb,
> 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?
>> The kernel from the initial image boots and everything (except for the 
>> touchscreen) works.
> Touch screen is no real surprise if it's an AllWinner based tablet,
> they change them constantly based on cost and availability.
>> this is version 4.13.3-300.fc27.amv7hl,
>> i also installed version 4.13.9-300.fc27.amv7hl,
> If one 4.13 works it's not surprising others do, what about 4.14.x
>> and these also work fine,
>> Then i updated to the latest fedora 27 kernel 4.15.15-300.fc27.armv7hl and 
>> this kernel starts booting, but then the screen goes blank, and i cannot 
>> login via ssh either,
> Can you some how grab the output up until it goes blank, I suspect
> that last output might give us some idea.
>> the same happened with a self compiled kernel 
>> 4.17.0-0.rc0.git0.300.fc27.armv7hl with lima drivers patched.
> 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 have tried to find the serial port pins on the board, but could not locate 
>> them, also kernel versions 4.14 i have not tried yet because i cannot find 
>> them precompiled.


It looks like sunxi.org has a web page for this device:


According to the wiki article the serial port pins are hidden under the touch 
screen cable.

> 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.
>> Are there any parameters i can change to try to make it boot, or get more 
>> output in the process? Or a link to documentation :)
> 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
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