Op dinsdag 16 juni 2020 14:12:12 CEST schreef Michal Suchánek: > On Tue, Jun 16, 2020 at 02:02:44PM +0200, Matthias Brugger wrote: > > +nicolas +michal > > > > On 16/06/2020 14:00, Freek de Kruijf wrote: > > > I am doing some testing with the newest Tumbleweed images for the > > > Raspberry Pi 4B. The micro-SD card I was using for the KDE version > > > showed a rather slow system. Long waiting between commands. > > > > > > After trying to change the default language with "yast language", which > > > pulls in quite a lot of new packages, the system was very slow. Finally > > > dmesg showed error messages complaining: > > > > > > mmc1 timeout waiting for hardware interrupt > > > > > > Searching for a solution I found the following patch: > > > > > > https://patchwork.kernel.org/patch/10219153/ > > > > > > The main cause seems to be the behaviour of certain SD cards of which I > > > apparently have one. I do have a similar card, same brand, same kind and > > > same size, which does not show this behaviour. > > > > > > So my question is: Has this patch been implemented in the newest version > > > of > > > Tumbleweed for the RPi4? > > Most likely. > > > > If not, would it solve this problem? > > No. > > In the case that matters it seems most of the system is locked up. I > suspect something essential like the DMA controller locks up rather than > the MMC controller itself. I can see now why Chinese chips employ > multiple DMA cotrollers with key components like storage having a > private DMA each. > > Given the low general interest and low occurence of these broken cards I > gave up on debugging this. > > I may be able to find the one card that exhibits the problem after > covid-19 situation stabilizes some more but I did not seriously try to > debug a low-level problem like this yet. > > Thanks > > Michal
I can send you my SD card if you wish. It behaves normally in my desktop computer. Send me your address by private email. It is a SanDisk Ultra 16 GB. -- fr.gr. member openSUSE Freek de Kruijf -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
