how to tail /sys/kernel/debug/remoteproc/remoteproc0/trace0 to external file

[SMich.1]

I tried :

tail -F /sys/kernel/debug/remoteproc/remoteproc0/trace0 >> myLog.log

but this command not printing new log messages that appear in the trace0 file.  

how can I print every line of log to some external file that not disappear when the remoteproc dies.

tnx.

[Olivier GALLIEN]

Hi @SMich.1​ ,

/sys/kernel/debug/remoteproc/remoteproc0/trace0 is a circular buffer not compatible with tail.

Alternative can be to root the trace to a physical UART on M4 side (if you have a spare one), else to implement a process Linux side which backup trace0 content periodically.

Hope it help,

Olivier