On 26/04/17, Greg KH wrote:
On Tue, Apr 25, 2017 at 11:11:38PM +0200, Oliver Graute wrote:
Hello list,
i'am using a null modem cable with two usb to serial converts on both ends between my develop and my target machine. The connection is fine. On both machines the serial interface is /dev/ttyUSB0 for this connection.
On the target machine I try to enable kgdboc
echo ttyUSB0 > /sys/module/kgdboc/parameters/kgdboc
but only got:
echo write error: No such device
if I try:
echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc
is not complaining. Some ideas why ttyUSB0 can't be used with kgdb?
USB needs interrupts in order to run properly, which kgdb doesn't enable when you stop the target, for obvious reasons :)
ok that make sense
Stick to a "real" serial connection and you should be fine.
thats not so easy. Even the old notebooks today lacks a "real" serial connection. Perhaps I should use a raspberry as target. There I can get a serial over the gpios. Best Regards, Oliver