- Launch QEMU with the currently built Linux by running the
following
command:
petalinux-boot --qemu --kernel
- Watch the QEMU console. You should see the details of the QEMU command. Get the GDB TCP port from -gdb tcp:<TCP_PORT>.
- Open another command console (ensuring the PetaLinux settings
script has been sourced), and change to the Linux directory:
cd "<plnx-proj-root>/images/linux"
- Start GDB on the vmlinux kernel image in command mode:
petalinux-util --gdb vmlinux
You should see the GDB prompt. For example:
petalinux-util --gdb vmlinux GNU gdb (GDB) 12.1 Copyright (C) 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-petalinux-linux --target=aarch64-xilinx-linux". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux... (No debugging symbols found in vmlinux) (gdb)
- Attach to the QEMU target in GDB by running the following GDB
command:
(gdb) target remote :9000
- To let QEMU continue execution:
(gdb) continue
- You can use
Ctrl+C
to interrupt the kernel and get back the GDB prompt. - You can set break points and run other GDB commands to debug the kernel.
CAUTION:
If another
process is using port 9000,
petalinux-boot
attempts
to use a different port. See the output of petalinux-boot
to determine what port was used. In the following
example, port 9001 is used: INFO: qemu-system-arm ... -gdb
tcp::9001 ...
Tip: It can be helpful
to enable kernel debugging in the kernel configuration menu ( ), so that kernel debug symbols are present in the image.