[U-Boot-Users] running custom apps under uboot

[U-Boot-Users] running custom apps under uboot

[himbA]

hi

I would like to code standalone app under uboot that would test my eth 
chip.
I tried running hello_world.srec from ram location and I got 'prefetch 
abort' on go. My procedure follows:
tftp a0100000 hello_world.srec
go a0140004 test test2
(go a0100000 test test2)

address value for go is memory location plus offset defined in Makefile. 
Both go commands yield an error and reset the board.

I would like to know what file and how to modify it to get standalone 
programs running from memory.

regards, himba

[U-Boot-Users] running custom apps under uboot

[Wolfgang Denk]

In message <403A50BA.10807@email.si> you wrote:
> 
> I would like to code standalone app under uboot that would test my eth 
> chip.
> I tried running hello_world.srec from ram location and I got 'prefetch 
> abort' on go. My procedure follows:
> tftp a0100000 hello_world.srec
> go a0140004 test test2
> (go a0100000 test test2)

How comes you are using 0xa0100000 as load address?  Did  you  modify
the  Makefile  so that this address gets used? The default value used
in U-Boot for ARM systems is 0xc100000 ...

> address value for go is memory location plus offset defined in Makefile. 
> Both go commands yield an error and reset the board.

Try running the code under a debugger...


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
You can observe a lot just by watchin'.                  - Yogi Berra

[U-Boot-Users] running custom apps under uboot

[himbA]

Wolfgang Denk wrote:
> In message <403A50BA.10807@email.si> you wrote:
> 
>>I would like to code standalone app under uboot that would test my eth 
>>chip.
>>I tried running hello_world.srec from ram location and I got 'prefetch 
>>abort' on go. My procedure follows:
>>tftp a0100000 hello_world.srec
>>go a0140004 test test2
>>(go a0100000 test test2)
> 
> 
> How comes you are using 0xa0100000 as load address?  Did  you  modify
> the  Makefile  so that this address gets used? The default value used
> in U-Boot for ARM systems is 0xc100000 ...
> 
I'm trying to download hello_world.srec to the memory and run it from 
the memory, as i do with the kernel. I didn't change any Makefiles nor 
any of the sources. Was it wrong to think that I could execute an image 
from the memory that way ?

> 
>>address value for go is memory location plus offset defined in Makefile. 
>>Both go commands yield an error and reset the board.
> 
> 
> Try running the code under a debugger...
> 
Yet to learn :). Going slow though.
> 
> Best regards,
> 
> Wolfgang Denk
> 
rgds, himba

[U-Boot-Users] running custom apps under uboot

[Wolfgang Denk]

In message <403A69EE.6000101@email.si> you wrote:
>
> >>tftp a0100000 hello_world.srec
> >>go a0140004 test test2
> >>(go a0100000 test test2)
> > 
> > How comes you are using 0xa0100000 as load address?  Did  you  modify
> > the  Makefile  so that this address gets used? The default value used
> > in U-Boot for ARM systems is 0xc100000 ...
> > 
> I'm trying to download hello_world.srec to the memory and run it from 
> the memory, as i do with the kernel. I didn't change any Makefiles nor 
> any of the sources. Was it wrong to think that I could execute an image 
> from the memory that way ?

Standalone applications are not position-independent. They are linked
for a specific address and must be  loaded  to  and  started  at  the
correct address.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
But it's real. And if it's real it can be affected ... we may not  be
able  to break it, but, I'll bet you credits to Navy Beans we can put
a dent in it.
	-- deSalle, "Catspaw", stardate 3018.2

[U-Boot-Users] running custom apps under uboot

[Detlev Zundel]

The keyboard of himbA <goavr@email.si> wrote:

> Wolfgang Denk wrote:
> > In message <403A50BA.10807@email.si> you wrote:
> > 
> >> I would like to code standalone app under uboot that would test my
> >> eth chip.
> >> I tried running hello_world.srec from ram location and I got
> >> 'prefetch abort' on go. My procedure follows:
> >>tftp a0100000 hello_world.srec
> >>go a0140004 test test2
> >>(go a0100000 test test2)
> > How comes you are using 0xa0100000 as load address?  Did  you
> > modify
> > the  Makefile  so that this address gets used? The default value used
> > in U-Boot for ARM systems is 0xc100000 ...
> > 
> I'm trying to download hello_world.srec to the memory and run it from
> the memory, as i do with the kernel. I didn't change any Makefiles nor
> any of the sources. Was it wrong to think that I could execute an
> image from the memory that way ?

Tftp will transfer the file byte by byte so the srec ASCII will end
up in RAM - I doubt that you can run that.  Try the hello_world.bin
binary file intended for this purpose.

Cheers
  Detlev

-- 
Two  monks went  fishing in an  electron river.  The first monk drew out his
network, and out flopped a hacker.  The second monk cried, "The poor hacker!
How can  it live outside of the  network?"   The first monk said,  "When you
have learned to live outside the network, then you will know."