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Hi,<br>
<br>
I changed the owner of the busybox, and used chmod as you told me for
bin/busybox but its permission are -rwsrwxr-x not srwxrwxr-x-r.<br>
<br>
--for compiling helloworld I used $powerpc-405-linux-gnu-gcc -static
helloworld.c -o helloworld<br>
<br>
--For ramdisk creation I followed the following steps:<br>
<br>
mkdir tmp/initrd<br>
dd if=/dev/zero of=images/initrd.img bs=1k count=8192<br>
/sbin/mke2fs -F -v -m0 images/initrd.img<br>
mount -o loop images/initrd.img tmp/initrd<br>
cp -av ramdisk/* tmp/initrd <br>
<br>
//here ramdisk holds directory structure.. I copied directory structure
from git, linux support ...but I changed lib and bin contents (bin <br>
contents with busybox-1.10.3 installation, and lib contents with lib of
my cross-compiler setup ,crosstool-0.28-rc35)<br>
<br>
umount tmp/initrd<br>
gzip < images/initrd.img > images/ramdisk.image.gz<br>
<br>
----For making directory structure of ramdisk I followed following steps<br>
for file in libc libcrypt libdl libm libpthread libresolv libutil<br>
do<br>
cp $file-*.so /home/neeraj/kerneldev/rootfs0.1/lib<br>
cp -d $file.so.[*0-9] /home/neeraj/kerneldev/rootfs0.1/lib<br>
done<br>
cp -d ld*.so* /home/neeraj/kerneldev/rootfs0.1/lib<br>
<br>
----And in menuconfig I selected filesystem as ramdisk with following
settings<br>
<*> RAM block device support <br>
(16) Default number of RAM disks <br>
(32768) Default RAM disk size (kbytes) <br>
<br>
// I think here can be the issue<br>
<br>
<div class="moz-signature">
<pre><!-- img src="file:///E:/htdg.jpg" border="0" alt="C-DAC"-->-------------------------------------------------------------------
Neeraj Garg
</pre>
</div>
<br>
<br>
Ron Sass wrote:
<blockquote cite="mid200807161447.m6GElde4032109@rsass-homer.uncc.edu"
type="cite">
<pre wrap="">Hmmm... I think you've got a problem with your ramdisk. There are
a couple of issues but these alone don't explain your helloworld test.
1. busybox should be set to root not neeraj
2. you need to setuid busybox for some apps to run
(chmod 4775 bin/busybox so that it is srwxrwxr-x-r)
3. I would be wary of Yaghmour's text... it is a little dated
and if I remember correctly, he uses some regular expressions
to copy "just" the libraries you need to lib; but with
newer versions of gcc/glibc these regular expressions
don't catch everything
Two questions:
Can you tell me exactly what your cross-compile command-line looks
like? How are compiling helloworld?
How are you creating the ramdisk? How do you go from directory
structure to ramdisk.image.gz?
Ron
</pre>
<blockquote type="cite">
<pre wrap="">Hi,
--Ron,Permissions are -rwxrwxr-x for all and owner is neeraj itself. And
shared libraries are present in lib/ . Now I have placed helloworld.elf
(using printf to print helloworld, and linked with -static option) in
bin/ and changed init=/bin/helloworld , again it says cannot execute
/bin/helloworld.
--John, we are using our custom hardware board, not exactly ML405 but
its more or less similar to ML405, so I cannot use bit file provided for
ML405. Till now we were using xilkernel, but now onward we are planning
to use Linux. For serial console I have no option other than uartlite.
This is how I compiled kernel :
1) make ARCH=ppc ml405_defconfig
2) patched kernel src with EDK(10.1) , so as to change xparameter.h, and
later made some changed in arch/ppc/boot/simple/embed_config.c and
xparameters.h file.
3) make ARCH=ppc menuconfig , and selected uartlite to be console and
ramdisk as file system.
4) Created ramdisk (as per Building embedded linux, Karim Yaghmour,
however major and minor number for device nodes is similar to ramdisk
provided at git.xilinx.com)
5) I have placed this ramdisk in arch/ppc/boot/images
6) And then issued $make ARCH=ppc CROSS_COMPILE=powerpc-405-linux-gnu-
zImge.initrd
--I have downloaded ELDK4.1 and installed it. And when I compile
simple helloworld.c using cross compiler, it says unresolved symbol
'printf' . Is there anything else to install with ELDK ?
-------------------------------------------------------------------
Neeraj Garg
In addition to what John wrote, I would also investigate your ramdisk.
I would be sure to check that you have the permissions/owner set correctly
on bin/busybox. Also, I would double check that, if you compiled busybox
with shared libraries, the shared libraries are in the right place
on your ramdisk.
Ron
>
> Hi,
>
> Yes I am using ARCH=ppc (actual line is $make ARCH=ppc
> CROSS_COMPILE=powerpc-405-linux-gnu- zImage.initrd ) for this I have
> placed ramdisk.image.gz in arch/ppc/boot/images. In case of ARCH=powerpc
> I cannot find processor type 405 , in make menuconfig. Thats why i am
> using ARCH=ppc.
>
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Hi,<br>
<br>
--Ron,Permissions are -rwxrwxr-x for all and owner is neeraj itself.
And shared libraries are present in lib/ . Now I have placed
helloworld.elf (using printf to print helloworld, and linked with
-static option) in bin/ and changed init=/bin/helloworld , again it
says cannot execute /bin/helloworld. <br>
<br>
--John, we are using our custom hardware board, not exactly ML405 but
its more or less similar to ML405, so I cannot use bit file provided
for ML405. Till now we were using xilkernel, but now onward we are
planning to use Linux. For serial console I have no option other than
uartlite. This is how I compiled kernel :<br>
<br>
1) make ARCH=ppc ml405_defconfig<br>
2) patched kernel src with EDK(10.1) , so as to change xparameter.h,
and later made some changed in arch/ppc/boot/simple/embed_config.c and
xparameters.h file.<br>
3) make ARCH=ppc menuconfig , and selected uartlite to be console and
ramdisk as file system.<br>
4) Created ramdisk (as per Building embedded linux, Karim Yaghmour,
however major and minor number for device nodes is similar to ramdisk
provided at git.xilinx.com)<br>
5) I have placed this ramdisk in arch/ppc/boot/images<br>
6) And then issued $make ARCH=ppc CROSS_COMPILE=powerpc-405-linux-gnu-
zImge.initrd<br>
<br>
<br>
--I have downloaded &nbsp; ELDK4.1 and installed it. And when I compile
simple helloworld.c using cross compiler, it says unresolved symbol
'printf' . Is there anything else to install with ELDK ?<br>
<br>
<br>
<div class="moz-signature">
<pre>-------------------------------------------------------------------
Neeraj Garg
</pre>
</div>
<br>
<br>
In addition to what John wrote, I would also investigate your ramdisk.
<br>
I would be sure to check that you have the permissions/owner set
correctly
<br>
on bin/busybox. &nbsp;Also, I would double check that, if you compiled
busybox
<br>
with shared libraries, the shared libraries are in the right place
<br>
on your ramdisk.<br>
<br>
<br>
Ron
<br>
<br>
&gt; <br>
&gt; Hi,
<br>
&gt; <br>
&gt; Yes I am using ARCH=ppc (actual line is $make ARCH=ppc <br>
&gt; CROSS_COMPILE=powerpc-405-linux-gnu- zImage.initrd ) for this I
have <br>
&gt; placed ramdisk.image.gz in arch/ppc/boot/images. In case of
ARCH=powerpc <br>
&gt; I cannot find processor type 405 , in make menuconfig. Thats why i
am <br>
&gt; using ARCH=ppc.
<br>
&gt; <br>
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