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Subject: Re: [ECOS] remote debugging
From: Gary Thomas <gary@chez-thomas.org>
To: Vinayak P Risbud <vinayak@multitech.co.in>
Cc: eCos Discussion <ecos-discuss@sources.redhat.com>,
	gdb <gdb@sources.redhat.com>
In-Reply-To: <3D3C33F9.54517685@multitech.co.in>
References: <3D3C33F9.54517685@multitech.co.in>
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Date: Mon, 22 Jul 2002 09:43:00 -0000
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On Mon, 2002-07-22 at 10:34, Vinayak P Risbud wrote:
>         Hi,
>             I am trying to use remote debugging using LAN (Tcp/Ip) on
> Redboot
>             What I understood till now is,
>                     1.  the main polls net_io_test function during idle
> time
>                     2.  The function net_io_test checks for
>                                         tcp_sock.state == _ESTABLISHED
>                     3.   If established, the control calls
> net_io_assume_console
>                          to setup debug channel.

More than that - at this point, all "console" I/O to RedBoot now goes
through the TCP/IP connection.

> 
>                 But,  after this, how the flow goes,  I am not able to
> trace.
>                 my gdb client on remote PC sends $Hc-1#09 command,
>                 over tcp/ip link.
>                 I am not able to trace, where and how exactly this gdb
>                 command is read and processed (i.e trap is generated ?)

As soon as RedBoot sees a "$" at the start of a command line, it 
switches to GDB (via a call to 'breakpoint()').  This happens whether 
you are using serial or network I/O.  GDB will then continue to use the
network connection for it's I/O to the target device.