Messages in this thread | | | Date | Wed, 14 Feb 2018 16:36:49 +0100 | From | Michal Suchánek <> | Subject | Re: [PATCH 1/2] mmc: bcm2835: reset host on timeout |
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On Wed, 14 Feb 2018 15:58:31 +0100 Stefan Wahren <stefan.wahren@i2se.com> wrote:
> Hi Michal, > > Am 14.02.2018 um 15:38 schrieb Michal Suchanek: > > The bcm2835 mmc host tends to lock up for unknown reason so reset > > it on timeout. The upper mmc block layer tries retransimitting with > > single blocks which tends to work out after a long wait. > > > > This is better than giving up and leaving the machine broken for no > > obvious reason. > > could you please provide more information about this issue (affected > hardware, kernel config, version, dmesg, reproducible scenario)? >
The RPi3 is known to not work with some SD cards. You can find some wiki pages with large tables of known-working and known-broken cards. I have a couple of RPi3 boards and a card that works and card that does not. I tried debugging the issue but did not find anything I can do about it - AFAICT the issue happens somewhere inside the MMC controller IP.
I have no inside knowledge of the controller in question but during testing I tried to reset the controller whenever the issue happens so I can continue running the test system for a longer time until it gets unusable. While I did not find any solution to the problem the workaround with resetting the controller works quite reliably for me.
So I am posting it in the hope that people with the wrong combination of RPi3 and SD card will not get a blank screen but rather a system that boots but tends to lock up for half a minute occasionally.
Thanks
Michal
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