capturing console (/dev/ttyS1) logs
 

Hi,

I have been trying to capture console logs from the init script.
When the ramfs is mounted, i check if usb is connected , if conncted, i mount it and redirected the console logs like so:

I'm getting

I tried changing the permission to 777, but to no avail.
I also tried sudo, and found out that our ramfs does not support this command.
The console logs are still being printed on the monitor.

Please suggest a solution.

Thanks.

Does your distro have a boot logging facility such as bootlogd?

This is on an embedded device, and these logs come from ramfs.

Sorry -- I don't have a solution but doesn't that command (those two commands) means "run cat in the background" followed by "execute /dev/ttyS1 and append the output to /mnt/logs.txt"?

AFAIK from studying bootlogd source code too long ago for memory to serve well, intercepting writes to the console is non-trivial. I had a look for the bootlogd source code to refresh memory but could not find it.

Thank you the speedy response and your precious time.

That is my intention, but nothing is happening when i do this. When i try from command line:

It hangs...

Also in our ramfs, we are printing logs to screen using DEBUG1L(); function.
Capturing this is my ultimate aim.

Also any suggestion to diagnose this problem better is welcome.

Better but unlikely to work because you want to capture writes to /dev/ttyS1, not output from it (whatever that means -- AFAIK the keyboard input goes via a complex route through the kernel).

Ideas for a solution could come from the bootlogd source code .. but where is it?!