[U-Boot-Users] Problems with Hello_world example

[U-Boot-Users] Problems with Hello_world example

[Sonia Martinez Baro]

Hi all,

we're using u-boot in a DBPXA250 based platform. We've burnt u-boot in Flash 
memory and successed to communicate with it using hyperterminal or minicom. 
Then we've loaded hello_world.bin in 0x00040004 and typed in u-boot's 
prompt:
  go 40004 Hello world
The result is:

## Starting application at 0x00040004 ...
03  3   3   ## Application terminated, rc = 0x0

(Note that "3   ## Application terminated, rc = 0x0" is printed when we hit 
any key).

My doubts are:

When this example is compiled, we are using the binary file that is created 
but, is this binary file created for our platform or does this example only 
work with some specific architectures?? Should it work correctly in our 
DBPXA250 bassed platform??

The u-boot's messages say that stdin, stdout and stderr are in the serial 
port (because we aren't initializating the LCD). The hello_world example 
program is printing messages using the printf() function and we suppose that 
when we compile for our system, the printf() function is trying to print 
those messages through the stdout of our system (that in this case is the 
serial port, isn't it??). So why can't we see the messages that is printing 
the Hello_world application thought serial line??? Why are we only seeing 
those numbers (03 3 3)??? It can't be a baudrate problem, can it??

Thanks in advance for your help,

Sonia

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[U-Boot-Users] Problems with Hello_world example

[Stephan Linz]

Am Dienstag, 17. Februar 2004 17:51 schrieben Sie:
> Hi all,
>
> we're using u-boot in a DBPXA250 based platform. We've burnt u-boot in
> Flash memory and successed to communicate with it using hyperterminal or
> minicom. Then we've loaded hello_world.bin in 0x00040004 and typed in

Hi,

hellow_world can't run @ 0x00040004 correct -- have a look into 
examples/Makefile. For ARCH=arm and that's the case for DBPXA250 based boards 
there is a LOAD_ADDR=0xc100000. So the hello_world example will linked to 
0xc100000 (not 0x00040004).

You should adapt LOAD_ADDR to your board specific environment or load and 
start hello_world.bin to the given address.


Best Regards,
Stephan Linz

[U-Boot-Users] Problems with Hello_world example

[Wolfgang Denk]

In message <LAW12-F23kjho31VINg0005f0dc@hotmail.com> you wrote:
> 
> we're using u-boot in a DBPXA250 based platform. We've burnt u-boot in Flash 
> memory and successed to communicate with it using hyperterminal or minicom. 
> Then we've loaded hello_world.bin in 0x00040004 and typed in u-boot's 
> prompt:
>   go 40004 Hello world

This is wrong. Load at 0x00040000 and start at 0x00040004.

> When this example is compiled, we are using the binary file that is created 
> but, is this binary file created for our platform or does this example only 
> work with some specific architectures?? Should it work correctly in our 
> DBPXA250 bassed platform??

It should work on all platforms. I never tested it on DBPXA250, though.

> The u-boot's messages say that stdin, stdout and stderr are in the serial 
> port (because we aren't initializating the LCD). The hello_world example 
> program is printing messages using the printf() function and we suppose that 
> when we compile for our system, the printf() function is trying to print 
> those messages through the stdout of our system (that in this case is the 
> serial port, isn't it??). So why can't we see the messages that is printing 
> the Hello_world application thought serial line??? Why are we only seeing 
> those numbers (03 3 3)??? It can't be a baudrate problem, can it??

This is most probably a usage error. See above.


Best regards,

Wolfgang Denk

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