Hello,
I have a pb using kgdb on a 2.6.30 kernel over a serial line .
I have given this kernel command line to the test machine :
ro kgdb=/dev/ttyS0,115200 kgdboc=ttyS0,115200
On the test machine, from the root directory of 2.6.30 sources I launch ddd
vmlinux.
Then within ddd, I type: set remotebaud 115200,
set debug remote 1
Then back to the test machine, within a terminal , I type as root :
echo g > /proc/sysrq-trigger that freezes the test machine .
Finally back in the development machine, within ddd I type :
target remote /dev/ttyS0 and here is what ddd displays :
(gdb) target remote /dev/ttyS0
Sending packet: $qSupported#37...Sending packet: $qSupported#37...Sending
packet: $qSupported#37...Sending packet: $qSupported#37...Timed out.
Timed out.
Timed out.
Ignoring packet error, continuing...
Packet qSupported (supported-packets) is supported
warning: unrecognized item "timeout" in "qSupported" response
Sending packet: $?#3f...Sending packet: $?#3f...Sending packet: $?#3f...Sending
packet: $?#3f...Timed out.
Timed out.
Timed out.
Ignoring packet error, continuing...
Sending packet: $Hc-1#09...Sending packet: $Hc-1#09...Sending packet:
$Hc-1#09...Sending packet: $Hc-1#09...Timed out.
Timed out.
Timed out.
Ignoring packet error, continuing...
Sending packet: $qC#b4...Sending packet: $qC#b4...Sending packet:
$qC#b4...Sending packet: $qC#b4...Timed out.
Timed out.
Timed out.
Ignoring packet error, continuing...
Sending packet: $qOffsets#4b...Sending packet: $qOffsets#4b...Sending packet:
$qOffsets#4b...Sending packet: $qOffsets#4b...Timed out.
Timed out.
Timed out.
Ignoring packet error, continuing...
Malformed response to offset query, timeout
(gdb)
If I add 'kgdbwait' option in the test machine kernel command line options
the kernel stops on the test machine, and I succeed to attach gdb from the dev
machine to the kernel test machine.
Breaking on printk function works for the first times first or second hundreds,
but if I ask to ignore 500 printk's before the kernel stops, it actually
doesn't stop and stays stalled .
Do you have an idea of the way to fix that ?
Thanks a lot,
Cédric
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