gdb on Fiasco

[FERANDELLE Pascal]

I took a copy of the floppy demo image on the Fiasco site, and try to use gdb on fiasco, from a PC/Linux with serial line, and gdb 6.4.
I create a new grub entry to launch fiasco without the flags -noserial, -nowait and -nokdb, and the hello module.
Boot seems ok, I suppose fiasco enters kdb and waits for a connexion from the serial line.

On the PC/Linux, I launch gdb, and enter commands :

set remotebaud 115200
target  remote /dev/ttyS0

A dialog seems to establish with the target as I have the messages :

Remote debugging using /dev/ttyS0
Sending packet: $Hc-1#09...Ack
Packet received:
Sending packet: $qC#b4...Ack
Packet received:
Sending packet: $qOffsets#4b...Ack
Packet received:
Sending packet: $?#3f...Ack
Packet received: S05
Sending packet: $Hg0#df...Ack
Packet received:
Sending packet: $p8#a8...Ack
Packet received:
Sending packet: $g#67...Ack
Packet received: 0000000001000000041e03
Sending packet: $m0,8#01...Ack
Timed out.
Timed out.
Timed out.
...

but the PC running Fiasco is resetting !!!

Any information will be helpful ...
Thanks

Pascal