Connecting GDB to the kernel

The cross GDB for your architecture should be used, either sh4-linux-gdb or arm-linux-gdb.

Before debugging, the debugger must connect to the KGDB using the chosen communication method. For example:

Using the serial port:

% sh4-linux-gdb
(gdb) file vmlinux
(gdb) set remotebreak 1
(gdb) set remotebaud 115200
(gdb) target remote /dev/ttyS1
(gdb) continue

Using KGDB ethernet support:

% sh4-linux-gdb
(gdb) file vmlinux
(gdb) set remotebreak 0
(gdb) target remote udp:<src-ip>:<src-port>
(gdb) continue

The kernel can then be debugged like any other application.

STLinux