Re: [Simulavr-devel] simulator performance

[Joel Sherrill]

Weddington, Eric wrote:
>  
>
>   
> > -----Original Message-----
> > From: Joel Sherrill [mailto:address@hidden 
> > Sent: Thursday, March 12, 2009 1:55 PM
> > To: Weddington, Eric
> > Cc: address@hidden
> > Subject: Re: [Simulavr-devel] simulator performance
> >
> >     
> > > > I have created an issue as a starting point
> > > > on the performance investigation.  I managed
> > > > to get the standard Net drystone code to compile
> > > > for atmega128 but don't know how to run it.  How
> > > > does one configure the simulator to get avr-libc
> > > > stdio to go to the console?
> > > >     
> > > >         
> > > What console? ;-)
> > >
> > >   
> > >       
> > Something I can see?  /dev/stdout?
> >
> > Sorry console is a word with meaning in the RTEMS
> > community.  It is from the old school UNIX /dev/console.
> >     
>
> Umm. We don't have /dev/anything.
>
> One creates their own putchar/getchar functions and associates them with a 
> particular stream. That way you can read/write to a UART, or write to an LCD, 
> or whatever peripheral comes to mind that can accept some sort of I/O. There's 
> just no basic assumption that any particular I/O device exists on an AVR.
>   
Hmm.. so putchar/getchar are empty stubs by default and printf is
eating the characters?

So simple wrappers for the magic read char, write char,
and exit devices would be appropriate?

In RTEMS terms, this would be a crude BSP. :-D

--joel

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