Re: [ECOS] printf

[Grant Edwards <grante at visi dot com>]

On Wed, Dec 06, 2000 at 02:07:39PM -0800, Fabrice Gautier wrote:
> > -----Original Message-----
> > From: Jonathan Larmour [mailto:jlarmour@cygnus.co.uk]
> > Subject: Re: [ECOS] printf
> > 
> > Ilko Iliev wrote:
> > > 
> > > Hi all!
> > > 
> > > I have successful compiled hello.c from eCOS examples. I start
> > > the program with arm-elf-gdb (with simulator and JTAG wiggler).
> > > It hangs by printf().
> > > 
> > > How work printf()? Where is the printf() output?
> > 
> > On the relevant serial line of your target. But if you are not
> > using the serial line for debugging, then you will need to
> > configure eCos to use the serial line directly, and not wrap
> > things in GDB packets.
> 
> The best way would be for eCos to use semihosting when using a
> JTAG device... Does the soon(?)-coming ARM Integrator port plan
> to suport that?

I don't see how you could do semihosting when using JTAG.  

AFAIK, user code on the ARM has no access at all to the ICE
macrocell, so there's no way for application code to send or
get data from something at the other end of the JTAG port.  The
Angel Debugging Protocol used by some JTAG interfaces has
support for semihosting, but I think it's only used if you're
using the Angel monitor (or other user SW) to process ADP
packets on the ARM.

-- 
Grant Edwards
grante@visi.com