Re: test app

[Baruch Siach <baruch@tkos.co.il>]

Hi Vanalme,

On Mon, Mar 14, 2011 at 03:55:29PM +0100, Vanalme Filip wrote:
> Hi,
> 
> Would I have to change a lot if I would like to use standard libraries (e.g.  
> stdio for printf and sprint) in my test app ?

For printf you may use a standalone implementation, and just provide a putc() 
routine. See the following implementations:

http://www.sparetimelabs.com/tinyprintf/index.html
http://www.menie.org/georges/embedded/

baruch

> > -----Original Message-----
> > From: barebox-bounces@lists.infradead.org [mailto:barebox-
> > bounces@lists.infradead.org] On Behalf Of Vanalme Filip
> > Sent: woensdag 9 maart 2011 9:29
> > To: Baruch Siach
> > Cc: barebox@lists.infradead.org
> > Subject: RE: test app
> > 
> > > -----Original Message-----
> > > From: Baruch Siach [mailto:baruch@tkos.co.il]
> > > Sent: dinsdag 8 maart 2011 19:09
> > > To: Vanalme Filip
> > > Cc: barebox@lists.infradead.org
> > > Subject: Re: test app
> > >
> > > Hi Vanalme,
> > >
> > > On Tue, Mar 08, 2011 at 04:52:49PM +0100, Vanalme Filip wrote:
> > > > Compiling and linking seems to work well now. When I dump the .elf, I see
> > > > that the start address is 0xA7E00000. That's what I wanted.
> > > > However, when loading the app in ram and executing it, I see that it tries to
> > start
> > > from 0xA0000000 (this is the base address of the RAM section) :
> > > >
> > > > barebox:/test tftp testapp.bin
> > > > TFTP from server 10.0.48.80 ('testapp.bin' -> 'testapp.bin')
> > > >
> > > > barebox:/test cp testapp.bin /dev/ram0
> > > > barebox:/test go /dev/ram0
> > > > ## Starting application at 0xA0000000 ...
> > > > ?¶/ÿ'.e¢Óø­ñ_
> > > >
> > > > _øýàõÒÿ ïO
> > > >           ÿOÿðzþðöàþ A'}®ÿ
> > > > ùý"õÿ?O¿PP¼@Y
> > > >              }¸m
> > > >                ×´ï@ïðx`G-/
> > > >
> > > >
> > > > Should I specify an address when executing 'go' or 'cp' ? Isn't it loading the
> > app
> > > always at the beginning of the RAM space, i.e. 0xA0000000 ?
> > >
> > > Is 0xA0000000 the beginning of you external RAM?
> > 
> > 
> > [Filip]  yes.
> > I meanwhile adjusted Makefile and test app source code to start from address
> > 0xA0000000. This seem to work well. My test app is running now.
> > Because it's just a test app, I think it's OK to put it at the beginning of the external
> > RAM (so at address 0xA0000000). No use in trying to move it to another region in
> > the external RAM, is it ?
> > 
> > >
> > > Note that in my example I used /dev/sram0 (on-chip 128K SRAM), not /dev/ram0
> > > (external DDR2 RAM).
> > >
> > > baruch
> > >
> > 
> > [Filip] If I'm right (have to verify though), i.MX27 does not have any SRAM on
> > board. So, I guess external RAM will be the only option. Because the test app
> > resides in the external RAM, it won't be possible to test the whole RAM. But I think
> > we can live with that limitation.
> > 
> > Thanks !
> > 
> > Filip

-- 
                                                     ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch@tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

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