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To: "xchen" <xchen@sunrisetelecom.com.cn>
Cc: <gdb@sourceware.org>
Subject: Re: (Rising Spam Alert)gdbserver can't run over serial
References: <20070929080553.740EF13B821@lax-gw04.mroute.net>
From: Jim Blandy <jimb@codesourcery.com>
Date: Tue, 02 Oct 2007 21:52:00 -0000
In-Reply-To: <20070929080553.740EF13B821@lax-gw04.mroute.net> (xchen@sunrisetelecom.com.cn's message of "Sat, 29 Sep 2007 16:06:37 +0800")
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"xchen" <xchen at sunrisetelecom.com.cn> writes:
> This is the initial msg for gdb. Maybe useful.
>
> (gdb) target remote /dev/ttyS0
> Remote debugging using /dev/ttyS0
> Sending packet: $qSupported#37...Ack
> Packet received:
> Packet qSupported (supported-packets) is NOT supported 

No, that's not a problem.  The remote protocol specifies that, if a
stub receives a packet it doesn't understand, it should send back the
empty string as a reply.  GDB tries using whatever packets it hopes
will work; if the stub says it doesn't understand them, then GDB tries
to find other ways to get the job done.  So:

> Packet qSupported (supported-packets) is NOT supported 

just means that GDB tried to send a 'qSupported' packet to the stub,
but the stub didn't understand it, and GDB has decided not to try
that again.