breakpoints if you desire to run with the ``CONFIG_STRICT_KERNEL_RWX``
option turned on, else you need to turn off this option.
-Next you should choose one of more I/O drivers to interconnect debugging
+Next you should choose one or more I/O drivers to interconnect the debugging
host and debugged target. Early boot debugging requires a KGDB I/O
driver that supports early debugging and the driver must be built into
the kernel directly. Kgdb I/O driver configuration takes place via
-kernel or module parameters which you can learn more about in the in the
+kernel or module parameters which you can learn more about in the
section that describes the parameter kgdboc.
Here is an example set of ``.config`` symbols to enable or disable for kgdb::
Configure kgdboc at runtime with sysfs
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-At run time you can enable or disable kgdboc by echoing a parameters
-into the sysfs. Here are two examples:
+At run time you can enable or disable kgdboc by writing parameters
+into sysfs. Here are two examples:
1. Enable kgdboc on ttyS0::
Kernel parameter: ``nokaslr``
-----------------------------
-If the architecture that you are using enable KASLR by default,
+If the architecture that you are using enables KASLR by default,
you should consider turning it off. KASLR randomizes the
-virtual address where the kernel image is mapped and confuse
-gdb which resolve kernel symbol address from symbol table
+virtual address where the kernel image is mapped and confuses
+gdb which resolves addresses of kernel symbols from the symbol table
of vmlinux.
Using kdb
kgdb
- Now disconnect your terminal program and connect gdb in its place
-
2. At the kdb prompt, disconnect the terminal program and connect gdb in
its place.
helper functions in some of the other kernel components to make it
possible for kdb to examine and report information about the kernel
without taking locks that could cause a kernel deadlock. The kdb core
- contains implements the following functionality.
+ implements the following functionality.
- A simple shell