Hi Jan,

Am 22.06.19 um 20:40 schrieb Jan Kratochvil:
> On Sat, 22 Jun 2019 10:59:29 +0200, Stefan Wahren wrote:
>> it does matter, because there is zero free documentation about the
>> sdhost controller on the BCM2835.
> "Kingston C16G JAPAN, SDC2", bought in 2009.
>
>
>> Raspbian uses their downstream sdhost driver
>> bcm2835-sdhost, while Fedora the mainline driver bcm2835. This one was
>> derived from the downstream one around kernel 4.12.
> So why not to update upstream kernel from the downstream one again...
this won't work. During upstreaming process there has been a lot of
changes to get this driver mainline. So we can't simply merge them
again. We need to finding the offending upstream commit and revert it.
>
>
>>> # I have verified now that it is a regression
>>> # since (as this kernel boots fine directly from my Kingston MicroSD):
>>> #   Fedora-Server-29-1.2.aarch64.raw.xz = kernel-4.18.16-300.fc29.aarch64
>> Thanks this is very helpful. Could you please test Fedora kernel 4.19
>> and 5.0 for aarch64? This would narrow down the issue much more.
> I have tried to put the kernel-4.18.16-300.fc29 driver
> drivers/mmc/host/bcm2835.c into kernel-5.1.12-300.fc30:
>       https://people.redhat.com/jkratoch/bcmbug.diff
>       https://koji.fedoraproject.org/koji/taskinfo?taskID=35710809
>
> And it booted without any error - normally it fails in 60-100 seconds after
> boot like:
>       [   70.246299] sdhost-bcm2835 3f202000.mmc: timeout waiting for 
> hardware interrupt.
>
> But then with my custom built kernel I ran 'dnf distro-sync' and it failed
> again, just later:
>       [ 1059.688583] sdhost-bcm2835 3f202000.mmc: timeout waiting for 
> hardware interrupt.
>       [ 1059.793528] sdhost-bcm2835 3f202000.mmc: bcm2835_read_wait_sdcmd: 
> timeout (100 ms)
>       ...
>       [ 1060.341279] sdhost-bcm2835 3f202000.mmc: bcm2835_read_wait_sdcmd: 
> timeout (100 ms)
>       [ 1060.346235] sdhost-bcm2835 3f202000.mmc: previous command never 
> completed.
>       [ 1060.350784] print_req_error: I/O error, dev mmcblk0, sector 9965568 
> flags 1
>       [ 1060.350832] mmc0: card 495c removed
>       [ 1060.355420] EXT4-fs warning (device mmcblk0p3): ext4_end_bio:318: 
> I/O error 10 writing to inode 8907 (offset 0 size 2572288 starting block 
> 1245986)
>       [ 1060.366554] Buffer I/O error on device mmcblk0p3, logical block 
> 932129
>
> OK, I see maybe I will give up and just buy a newer MicroSD card...

It would be helpful to send me this card and i'll try to fix this.

Stefan

>
> Thanks,
> Jan Kratochvil
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