Linux kernel debugging on ARM9 LPC3250
 

Hello,

I'm trying to debug Linux kernel using KGDB:
- kernel was built with debugging symbols support, KGDB support, serial port driver support etc
- laptop running Debian GNU/Linux connected with Serial-To-Usb cable (/dev/ttyUSB0 at laptop, /dev/ttyS0 at the board)
- kernel boot args: console=ttyS0,115200n81 root=/dev/nfs rw nfsroot=192.168.0.7:/home/raydan/ltib/rootfs ip=192.168.0.10 init=/sbin/init kgdboc=ttyS0,115200

In minicom session after shell prompt I enter 'Ctrl+Alt+F+G' and get:
Then on the laptop I execute 'gdb vmlinux', then in gdb 'set remotebaud 115200' and 'target remote /dev/ttyUSB0'. Output is:
Looks like debugging initializes fine, but when I execute 'next' gdb command to step over kernel, gdb prints:
Then board console prints nothing, laptop gdb just hangs.

Could anybody help with this trouble?

--
Best Regards,
Dmitry Vinokurov

What happens if you use 'continue' instead of 'next'?

You also might want to try using 'kgdbwait' as one of the boot parameters too. That will make the target kernel hang as though you tripped the MagicKey, without you having to press the MagicKey.