Trying to remote debug question

Trying to remote debug question

[Fahd Abidi]

Hello,

I am trying to launch a remote debug into my target, I have a mips based
board but with only one serial port and No ethernet. I use the serial
port as the target console for my 2.6 kernel.

I am wondering if I can launch the GDBServer to use /dev/ttyS0 even
though my Linux console is also tied to this com port? It is the only
comport available on the target so I have to try and use it for both my
console and remote debugging. When I try to launch a GDB session to this
port it says "inappropriate IOCTL for this device".

Fahd Abidi

Re: Trying to remote debug question

[Daniel Jacobowitz]

On Mon, Jun 19, 2006 at 01:28:28PM -0400, Fahd Abidi wrote:
> Hello,
> 
> I am trying to launch a remote debug into my target, I have a mips based
> board but with only one serial port and No ethernet. I use the serial
> port as the target console for my 2.6 kernel.
> 
> I am wondering if I can launch the GDBServer to use /dev/ttyS0 even
> though my Linux console is also tied to this com port? It is the only
> comport available on the target so I have to try and use it for both my
> console and remote debugging. When I try to launch a GDB session to this
> port it says "inappropriate IOCTL for this device".

There used to be a multiplexer, called kdmx, that allowed you to use
one port for both console and debug.  But I haven't seen a copy of it
in a few years now.

The inappropriate ioctl message can probably be ignored.  If you tell
gdbserver to write its stdout/stderr to /dev/null and to open a
connection to /dev/ttyS0, it should work.

-- 
Daniel Jacobowitz
CodeSourcery

RE: Trying to remote debug question

[Fahd Abidi]

Thank you, that sounds promising.

Would you happen to know the command to tell gdbserver to write its
stdout/stderr to /dev/null?

Fahd
 


-----Original Message-----
From: Daniel Jacobowitz [mailto:drow@false.org] 
Sent: Tuesday, June 20, 2006 8:31 AM
To: Fahd Abidi
Cc: gdb@sourceware.org
Subject: Re: Trying to remote debug question


On Mon, Jun 19, 2006 at 01:28:28PM -0400, Fahd Abidi wrote:
> Hello,
> 
> I am trying to launch a remote debug into my target, I have a mips 
> based board but with only one serial port and No ethernet. I use the 
> serial port as the target console for my 2.6 kernel.
> 
> I am wondering if I can launch the GDBServer to use /dev/ttyS0 even 
> though my Linux console is also tied to this com port? It is the only 
> comport available on the target so I have to try and use it for both 
> my console and remote debugging. When I try to launch a GDB session to

> this port it says "inappropriate IOCTL for this device".

There used to be a multiplexer, called kdmx, that allowed you to use one
port for both console and debug.  But I haven't seen a copy of it in a
few years now.

The inappropriate ioctl message can probably be ignored.  If you tell
gdbserver to write its stdout/stderr to /dev/null and to open a
connection to /dev/ttyS0, it should work.

-- 
Daniel Jacobowitz
CodeSourcery

Re: Trying to remote debug question

[Daniel Jacobowitz]

On Tue, Jun 20, 2006 at 09:17:33AM -0400, Fahd Abidi wrote:
> Thank you, that sounds promising.
> 
> Would you happen to know the command to tell gdbserver to write its
> stdout/stderr to /dev/null?

This is Unix.
  gdbserver /dev/ttyS0 ./command >/dev/null 2>/dev/null


-- 
Daniel Jacobowitz
CodeSourcery