Hi Maciej, > Do you use the netconsole then too? Using a USB serial port adapter > would be an alternative, although not a very powerful one either, because > you need to have many parts of the OS initialised before you can get to > such a port. No, I haven't used netconsole, but I do have a frame buffer. There have been a few very early kernel crashes during the porting from v2.6 to v4.15. All of them could be identified to a single commit by bisection, and then it was easy to find a solution to proceed, fortunately. Eventually I'd like to get kexec working. I suspect it could be somewhat tricky to debug though. Fredrik
