test app

[Vanalme Filip]

> -----Original Message-----
> From: Baruch Siach [mailto:baruch at tkos.co.il]
> Sent: maandag 14 maart 2011 19:04
> To: Vanalme Filip
> Cc: barebox at lists.infradead.org
> Subject: Re: test app
> 
> 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

[Filip] 
Thanks for the information.

I guess this one is because I'm not an experienced programmer.... :

If I use a division operator or a modulo division operator in a static function, all compiles well. If I change the static function into a global function, I get following errors :
Undefined reference to '__aeabi_idiv'
Undefined reference to '__aeabi_idivmod'

The function looks basicly like this (just took the 'problem' part) :

static void testfunc (int row)
{
	char c[2];

	c[0] = row / 10 + '0';
	row %= 10;
	c[1] = row + '0';
}

This is how my Makefile looks like :	

CC 			= $(CROSS_COMPILE)gcc
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
AR			= $(CROSS_COMPILE)ar
AS			= $(CROSS_COMPILE)as
LD			= $(CROSS_COMPILE)ld

CFLAGS		= -Wall -Os -nostdlib -Wl,-Ttext=0xA0000000
OBJECTS		= testapp.o gpio.o uart.o time.o
SRCS		= $(OBJECTS:.o=.c)

all: testapp.bin

%.bin : %.elf
	$(OBJCOPY) -O binary $^ $@
	
%.elf : $(SRCS)
	$(CC) $(CFLAGS) $^ -o $@
	$(OBJDUMP) -S $@ > dump	
	
.PHONY: clean	
clean:
	rm -f *bin *elf $(OBJECTS)		

I never encountered this problem before in other projects and I don't see why this is working in static functions and not in global functions.... 


Filip
> 
> > > -----Original Message-----
> > > From: barebox-bounces at lists.infradead.org [mailto:barebox-
> > > bounces at lists.infradead.org] On Behalf Of Vanalme Filip
> > > Sent: woensdag 9 maart 2011 9:29
> > > To: Baruch Siach
> > > Cc: barebox at lists.infradead.org
> > > Subject: RE: test app
> > >
> > > > -----Original Message-----
> > > > From: Baruch Siach [mailto:baruch at tkos.co.il]
> > > > Sent: dinsdag 8 maart 2011 19:09
> > > > To: Vanalme Filip
> > > > Cc: barebox at 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 at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -