Hi,

I am trying to get kgdb and kdb to work on DB410c, but I am having problems with the serial driver. I have compiled with these options:

CONFIG_KGDB=y CONFIG_KGDB_SERIAL_CONSOLE=y CONFIG_KGDB_KDB=y CONFIG_KDB_DEFAULT_ENABLE=0x1

I am using the kernel from git.linaro.org/landing-teams/working/qualcomm/kernel.git, branch release/qcomlt-4.9.

So, I enable kdb/kgdb on the serial console like so:

echo ttyMSM0 > /sys/module/kgdboc/parameters/kgdboc echo g > /proc/sysrq-trigger

Then it enters kdb mode, and things start to go wrong. For example, keystrokes are sometimes ignored, and then repeated 20 or 30 times after a few other keystrokes. When trying to connect to kgdb over a serial line (after quitting from the terminal emulator on the console, of course) I don't get any connection.

I have a feeling that it is a problem with the implementation of poll_get_char and poll_put_char in the serial driver. Has anyone seen this type of behaviour? Any ideas on how to fix?

Regards, Chris Simmonds