questions about stand alone application - flash a LED

HI:)

You can use the go CMD to test your app.
Here post my used step.

Write a simple code.It's just include a function definition

	void _start()
    {
    }

Then compile it.After do that use following step:
ppc_82xx-ld -Bstatic -Ttext 0x00001000 board/bname/ttt.o -o ttt.elf

-bash-2.05b$ ppc_82xx-objdump -d ttt.elf

ttt.elf: file format elf32-powerpc

Disassembly of section .text:

00001000 <_start>:

    1000:       94 21 ff e8     stwu    r1,-24(r1)
    1004:       38 21 00 18     addi    r1,r1,24
    1008:       4e 80 00 20     blr

-bash-2.05b$

you can see the function just call the stack operation. then you can put your test code to the _start function's body, and run the step above again.

finally to get a pure bin file:
ppc_82xx-objcopy --gap-fill=0xff -O binary ttt.elf ttt.bin

and then test the code in the u-boot prompt:
u-boot> tftp 0x1000 ttt.bin
u-boot> go 0x1000

======= 2008-04-14 16:33:55 ????????=======

Quoted 29 lines

Hello :-)

I am looking for an example code for a Flash LED, for a stand alone application. I did read the examples like "hello world" and the /doc/standalone.

I would like to know If I can build a stand alone application without build the u-boot -- I would appreciate if someone point me to a tutorial, I just find examples for load Linux...

I am a newbie in 32 bits world. I am trying to port Rockbox*, the Free Software firmware for audio DAPs like IPods, Sansas, etc., for a Free/Open hardware, the Rockbox Player**.

I need to use u-boot to launch that firmware, first I would like to start doing a flash led application. I did build u-boot, using the sources that came with the dev. board I am using, with success however the firmware I want to build don't build with arm-linux-gcc, just with arm-elf-gcc.

I appreciate any suggestions, any guidance. Thank you.

Jorge Pinto,

http://www.casainho.net

* http://www.rockbox.org/
** http://www.rockbox.org/twiki/bin/view/Main/RockboxPlayer

Quoted 9 lines

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?????????
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????????Leon.Z
????????leon.kernel at gmail.com
??????????2008-04-14

Quoted 9 lines

You can use the go CMD to test your app.
Here post my used step.

Write a simple code.It's just include a function definition

	void _start()
    {
    }

Then compile it.After do that use following step:
ppc_82xx-ld -Bstatic -Ttext 0x00001000 board/bname/ttt.o -o ttt.elf