stm32mp15x emmc reboot stuck-up

[MWoło.2]

Hi,

I have a problem with hanging up my board occasionally when an issue from the console reboot.

I read about and the internet says this is a problem with the EMMC memory's power cycle.

So I followed by a link

https://github.com/orangepi-xunlong/openwrt/commit/14d3a99e17f2ec6097eeef97530cba2d62c58d3c#diff-1335d7b270cc58c5342d5e2843730580bfe5d8048d765abb753050095929d85d

but still, after a few reboots my board stacked.

My final message from the console is as follows

[  OK  ] Stopped Create Static Device Nodes in /dev.                            
[  OK  ] Reached target System Shutdown.                                        
[  OK  ] Reached target Late Shutdown Services.                                 
[  OK  ] Finished System Reboot.                                                
[  OK  ] Reached target System Reboot.                                          
[   32.494373] watchdog: watchdog0: watchdog did not stop!                      
[   32.522678] systemd-shutdown[1]: Using hardware watchdog 'STM32 Independent 0
[   32.533457] systemd-shutdown[1]: Watchdog running with a timeout of 2min.    
[   32.559399] systemd-shutdown[1]: Syncing filesystems and block devices.      
[   32.687090] systemd-shutdown[1]: Sending SIGTERM to remaining processes...   
[   32.713669] systemd-journald[685]: Received SIGTERM from PID 1 (systemd-shut.
[   32.738780] systemd-shutdown[1]: Sending SIGKILL to remaining processes...   
[   32.764536] systemd-shutdown[1]: Unmounting file systems.                    
[   32.774792] [1459]: Remounting '/' read-only with options 'n/a'.             
[   32.798594] EXT4-fs (mmcblk1p8): re-mounted. Opts: (null). Quota mode: disab.
[   32.825938] systemd-shutdown[1]: All filesystems unmounted.                  
[   32.830174] systemd-shutdown[1]: Deactivating swaps.                         
[   32.835585] systemd-shutdown[1]: All swaps deactivated.                      
[   32.840200] systemd-shutdown[1]: Detaching loop devices.                     
[   32.854929] systemd-shutdown[1]: All loop devices detached.                  
[   32.859153] systemd-shutdown[1]: Stopping MD devices.                        
[   32.865032] systemd-shutdown[1]: All MD devices stopped.                     
[   32.869346] systemd-shutdown[1]: Detaching DM devices.                       
[   32.875192] systemd-shutdown[1]: All DM devices detached.                    
[   32.879905] systemd-shutdown[1]: All filesystems, swaps, loop devices, MD de.
[   32.924796] systemd-shutdown[1]: Syncing filesystems and block devices.      
[   32.930334] systemd-shutdown[1]: Rebooting.                                  
[   33.167515] reboot: Restarting system                                        
INFO:    PSCI Power Domain Map:                                                 
INFO:      Domain Node : Level 1, parent_node -1, State ON (0x0)                
INFO:      Domain Node : Level 0, parent_node 0, State ON (0x0)                 
INFO:      CPU Node : MPID 0x0, parent_node 0, State ON (0x0)                   
INFO:      CPU Node : MPID 0x1, parent_node 0, State ON (0x0)  

How to resolve this issue?

Thanks

BR

Michał

[PatrickF · Accepted solution]

Hi @MWoło.2 

this might come up from a know limitation, not linked to eMMC.

In case your board did not use STPMIC1 for supply (which issue a power cycle on VDDCORE in case of reset), you should connect NRST to NRST_CORE with a 1nF capacitor as listed in ES0438 "Incorrect reset of glitch-free kernel clock switch" or AN5031 "Discrete supplies example 3.3 V I/Os with DDR3L"

Regards,

[MWoło.2]

Hi Patrick,

it's working. I take care of everything else without connecting through the cap that two mentioned NRST.

Thanks a lot, the topic can be closed.

Best Regards

Michał