kernel debug

to redirect the console over a serial cable
1.enable settings in kernel hacking
2.dont forget to select serial option
3.additional settings in kernel arguments

to enable kgdb based debugging
1.again repeat the same above
2.put additional settings in kernel arguments
3.on the remote side start gdb with vmlinuz as arg
4.specify the source path
5.system.map is relevent only for target system , if the kernel crashes the target refers to
symbols in system.map its not relevent on kgdb based debugging
6.additional steps are required for module debugging