[Letux-kernel] Strange problem with non-LPAE letux-4.20-rc kernels on 4GB Pyra only

[H. Nikolaus Schaller]

Hi,

> Am 05.12.2018 um 07:18 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> Hi Nikolaus,
> 
> On Tue, 4 Dec 2018 23:00:13 +0100
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
> [...]
>>> root at letux:~# uname -a
>>> Linux letux 4.20.0-rc4-letux+ #3 SMP PREEMPT Fri Nov 30 20:38:05 CET 2018 armv7l GNU/Linux
>>> root at letux:~# 
>>> 
>>> panel enable is called here (my tree).  
>> 
>> Did you remove anything? I had tried with and without TILER patches and not seen a difference.
>> 
> Did you try my git branch? 
> https://github.com/akemnade/linux
> pyra-display-4.20-rc4

I'll try next.

> 
> I did not want upload anything on the goldelico server which
> is not a clean feature branch.
> [...]
>> 
>> This kernel binary was compiled Thu Nov 22 05:25:33
>> 
>> So something is broken in the mmc subsystem and sometimes works and
>> sometimes doesn't Most likely depending on the month number reported
>> by RTC.
>> 
> 
> I am missing lines like that. So really a mmc problem.
> 
> [    3.050931] mmc3: new high speed SDHC card at address 59b4
> [    3.057501] mmcblk3: mmc3:59b4 USD   7.51 GiB 
> [    3.063538]  mmcblk3: p1 p2

Indeed.

> 
> What happens if you compile the mmc host driver as a module
> and load it manually (or unbind/rebind the driver)?
> Just to check whether something just needs more
> time. I would then expect that to fail at all times.

Sure. Kernel can't boot from MMC without driver built into the kernel.
But that does not provide new information why it sometimes works
and was working 100% before...

Maybe a git bisect between 4.19 and 4.20-rc1 is better?
But I hesitate to start this adventure, since it is always
time-consuming and difficult to really do since we have to add
some feature branches to get a bootable system.

And the strange thing: I don't know what could have changed
now and before. The only things I have done was some testing
with different kernels and USB3-OTG.

What I can try next is to try 4.18 and older kernels until
I have one that works in all situations.

And I could try a different SD card. with the same images.

BR and thanks,
Nikolaus