Embedded linux on powerpc

Vijay Padiyar vijay_padiyar at hotmail.com
Fri Apr 1 20:36:47 EST 2005

Hi David

If your file was compiled statically (i.e. you gave the -static flag while
compiling & linking the file) then it will execute the application without
any problems.

If you have not used that flag (i.e. you're compiling your application using
dynamic library linking, which is preferrable) then you need to have the GNU
library and loader files (libc-2.3.3.so and ld-2.3.3.so and their symbolic
links, libc.so.6 and ld.so.6) in your target's /lib directory. You'll find
these in your toolchain's lib folder
(/home/yourname/tools/powerpc-603e-linux-gnu/lib). Copy these to your root
filesystem's lib directory.

Here is a snapshot of my root filesystem's /lib directory:

[chandrashekharp at linux lib]$ ls
ld-2.3.3.so        libm-2.3.3.so           libnss_files.so.2
ld.so.1            libm.so.6               libpthread-0.10.so
libc-2.3.3.so      libnsl-2.3.3.so         libpthread.so.0
libcrypt-2.3.3.so  libnsl.so               libresolv-2.3.3.so
libcrypt.so.1      libnsl.so.1             libresolv.so.2
libc.so.6          libnss_compat-2.3.3.so  librt-2.3.3.so
libdl-2.3.3.so     libnss_compat.so        librt.so            libutil.so.1
libdl.so.2         libnss_compat.so.2      librt.so.1          modules
libgcc_s.so        libnss_files-2.3.3.so   libstdc++.la
libgcc_s.so.1      libnss_files.so         libstdc++.so

Similarly, you can copy whatever library files you require from your
toolchain's lib folder to your root filesystem's lib folder.

To find out which library files your executable needs, you need to do a
readelf on the executable and search for shared library dependencies:

~ $ powerpc-603e-linux-gnu-readelf -a hello | grep "Shared"

Executing this command will give you an output like this:

 0x00000001 (NEEDED)                     Shared library: [libc.so.6]

This means hello needs libc.so.6 (libc-2.3.3.so) to execute properly. Next,
using the same command on libc.so.6 gives:

~ $ powerpc-603e-linux-gnu-readelf -a libc-2.3.3.so | grep "Shared"

 0x00000001 (NEEDED)                     Shared library: [ld.so.1]

So libc-2.3.3.so needs ld.so.1 (ld-2.3.3.so) to work. I think you can copy
these two files to your root filesystem's /lib directory and your app should
execute fine.


Vijay Padiyar

----- Original Message ----- 
From: <dmarty at enib.fr>
To: <vijay_padiyar at hotmail.com>
Sent: Friday, April 01, 2005 1:33 PM
Subject: Embedded linux on powerpc

> Hello,
> You wrote:
> >When I try to execute the resulting file on my target from the Linux
> >prompt, I get a message saying:
> >
> >/home # ./hello
> >/bin/sh: hello: File not found (or something like that)
> I have the same problem did you find a solution,
> thank you in advance for your response
> David
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