Re: [PATCH] remote target interrupt before ack

[Michael Walle <michael at walle dot cc>]

Am Montag 04 April 2011, 22:21:21 schrieb Pedro Alves:
> On Monday 04 April 2011 21:00:15, Michael Walle wrote:
> > Hi,
> > 
> > the following patch puts the sending of the interrupt/break sequence
> > before the proforma ACK. This guarantees the ACK won't be delivered to
> > an application on the remote side.

> 
> Can you explain what the latter sentence means a bit better?
> 
Oh, i forgot to mention that this bug affects serial lines which are shared 
with the GDB stub. Assume the remote needs a BREAK to start its gdb stub. If 
you send the '+' before the BREAK it will be delivered to the actual 
application running on the device (and of course listening on the serial 
port). [If there happens to be some echo service things will even go worse, 
because the echoed '+' will be interpreted by GDB as an ACK to the first sent 
packet.]

-- 
Michael