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From: "Vijay Padiyar" <vijay_padiyar@hotmail.com>
To: "LinuxPPC Support" <linuxppc-embedded@ozlabs.org>
Date: Fri, 28 Jan 2005 19:28:13 +0530
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Subject: problem executing simple app on ppc target running linux
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Hi

I have a doubt regarding execution of applications on Linux.

I am developing applications to execute on an MPC8260 (PowerPC) target. I
started off by building a toolchain for the target (using Kegel's
crosstool).

The compiler created for my target bears the name
'powerpc-603e-linux-gnu-gcc.'

Then I built the Linux 2.6.10 kernel with this cross-compiler and got the
executable image. I downloaded this image on the target and executed it
successfully. I have now obtained the Linux command prompt.

I am using U-Boot 1.1.1 as the bootloader and am loading the JFFS2 partition
on my Flash directly as the root drive, using the boot argument
'root=/dev/mtdblock3.'

The directory structure on my JFFS2 partition is as follows:

/bin (with Busybox)
/dev
/etc
/home (for my programs)
/lib (currently empty)
/proc (empty)
/sbin
/tmp
/usr - bin, sbin
/var

Now, I built a simple "Hello, World!" application with my cross-compiler
with the following command:

$ powerpc-603e-linux-gnu-gcc -o hello hello.c

When I try to execute the resulting file on my target from the Linux kernel
prompt, I get a message saying:

/home # ./hello
/bin/sh: hello: No such file or directory

When I compile the above file with my native gcc and execute on the target,
I get a message saying:

/home # ./hello
/bin/sh: hello: Line 1: Unexpected '(' in file (or something to that effect)

I know I can't execute apps built with gcc on the target. But why does it
not work even when built with the cross-compiler?

Another thing is, how do I compile applications with shared libraries? And
how do I know which specific shared library files I need to put in the /lib
and /usr/lib folders on my target JFFS2 partition for the program to execute
successfully?

Please give me some guidance. I'm a bit new to Linux.

Regards

Vijay Padiyar