On Fri, Feb 5, 2010 at 5:49 AM, Philippe Auphelle <pauphe...@gmail.com> wrote:
> FWIW, I had a similar problem first time I used kgdb.
> I'm using it to debug modules, butand when I reached my own hard coded
> int 3 in the module, I ended up with a timeout in gdb, andhost /
> target connectivty was lost.
>
> It happens that when kgbd was entered from the module (target), the
> serial port parms had been reset to some default value (like 9600)
> instead of the 115200 I had set in the kernel parms (I would get the
> right speed in the kernel on kgdbwait stop, the speed was messed after
> that). So kgdb sent at 9600 while gdb in the dev host was set to
> 115200.
Hi Philippe,
Maybe you set a wrong format parms to kgdb, so it uses the default parms.
You can add some printk at following functions, see what happens on that.
linux-2.6/drivers/serial/serial_core.c : 2231
int uart_poll_init()
{
int baud = 9600;
...
if (options) {
uart_parse_options(options, &baud, &parity, &bits, &flow);
/* here, the parms will be uesd by uart at last. */
printk(KERN_ERR "band:%d, parit: %d, bits: %d, flow:%d", baud,
parity, bits, flow);
return uart_set_options(port, NULL, baud, parity, bits, flow);
}
return 0;
}
Dongdong
> stty to the right parms just before loading the module in the target
> took care of that (would be nice if kgdb always set those parms back
> when waking up, though :) )
>
> Not sure this is related to the problem you have, but just in case it
> could help...
>
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