The kgdboc driver contains logic to request the graphics display to switch to a text context when you are using kgdboc=kms,kbd, provided that you have a video driver which has a frame buffer console and atomic kernel mode setting support.

Kgdboc is designed to work with a single serial port. It was meant to cover the circumstance where you wanted to use a serial console as your primary console as well as using it to perform kernel debugging. Of course you can also use kgdboc without assigning a console to …

2022年12月17日 · KGDB intend to be used as a source code level debugger on a running Linux kernel. It works with GDB and allows the user to inspect memory, variables, setup breakpoints, step lines and instructions. Pretty much the same that all application developers are used to, but for the kernel itself.

For kgdb/gdb, kgdboc is designed to work with a single serial port. It is intended to cover the circumstance where you want to use a serial console as your primary console as well as using it to perform kernel debugging.

2020年3月25日 · kgdboc is the debugger that helps debug the kernel over a remote gdb session. kdb gives a debug console to run commands directly against the kernel. It can dump physical memory, list running processes etc.

kgdb is a source level debugger for linux kernel. It is used along with gdb to debug a linux kernel. The expectation is that gdb can be used to "break in" to the kernel to inspect memory, variables and look through call stack information similar to what an application developer would use gdb for.

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 …

In order to use kgdb you must activate it by passing configuration information to one of the kgdb I/O drivers. If you do not pass any configuration information kgdb will not do anything at all. Kgdb will only actively hook up to the kernel trap hooks if a kgdb I/O driver is loaded and configured.

2013年6月18日 · 本文介绍的Kgdb调试方法是一种源码级的Linux内核调试器。 使用Kgdb调试内核时，需要结合gdb一起使用，使用他们可以对内核进行单步调试，设置断点，观察变量、寄存器的值等。 然而也有其限制条件，本文仅简单介绍使用串口的Kgbd的流程 (kgdboc方式),除此之外还网卡方式即kdgboe方式，Kgdb调试原理及kgdboe方式配置请参阅博文《Linux内核驱动开发之KGDB原理介绍及kgdboe方式配置》。 …

为了更加方便内核调试，社区开发了内核级的调试模块kdb和kgdb，通过它们可以实现对内核的在线调试。 其中kdb可以在本机独立运行，当需要执行调试工作时，可通过sysrq命令或按键等方式进入调试器。 然后就可以在调试器中执行打断点、单步调试、修改寄存器、内存，以及查看变量，调用栈等调试命令。 kdb极大地方便了内核调试工作，但其最大的问题是不能使用符号表，从而给调试工作带来不便。 为此内核还提供了kgdb调试方式的支持，在该方式下一共需要两台设备， …