[ELDK] [eldk 5] [arm] [qemu] init not tainted...

[gilles B]

Hi,


I would like to install a light linux on Qemu ARM VersatilePB.
I use my Intel Core i3 to cross compile linux kernel 3.11.


So, i've installed ELDK 5 to cross compile to ARM:
http://www.denx.de/wiki/ELDK-5/WebHome


I followed installation process and all seems ok.


In ARM compilation environment:
source /opt/eldk-5.5/armv6/environment-setup-armv6-vfp-linux-gnueabi


I've configured linux 3.11 kernel to use "versatile_defconfig" :
make versatile_defconfig
and I've added EABI option.
 
I can't use make menuconfig because it needs ncurses shared libraries and i don't know how to install them with cross-compilation tools. 



Any idea how to use ncurses with ARM ELDK ? (i tried to cross compile ncurses but i can't generate shared libraries).



So I've edited .config file and modified CONFIG_AEABI to yes: CONFIG_AEABI=y


I compiled linux kernel without any problem.
 
For
 my tiny test, i want to load kernel without root file system, just ram 
disk (initrd) and just an 'init' programm that displays 'hello' every 
seconds.


I've compiled this code 'hello.c':
#include <stdio.h>
#include <stdlib.h>
main (int ac, char **av)
{
  while (1) {
    printf ("Hello\n");
    sleep (1);
  }
}

I tried this : arm-linux-gnueabi-gcc -static -o init hello.c
Command failed:
...../arm-linux-gnueabi/4.8.1/ld: cannot find -lc
collect2: error: ld returned 1 exit status
Like said by Wolfgang Denk, it seems that static option is not well supported by kernel : http://lists.denx.de/pipermail/eldk/2012-July/002162.html


Unfortunately my test has became a little bit more complex because I've to manage shared libraries by compiling without static option.

 
Last part, before to test with qemu-system-arm,I created an init ram disk with these files into a tmp directory:
/dev/ttyAMA0
/init
/lib/ld-linux.so.3
/lib/libc.so.6
 I used commands: 
cd tmp
find ./ | cpio --dereference -H newc -o | gzip -9 > ../rootfs_qemu.gz

 
 
I've launched qemu with : 
qemu-system-arm
 -M versatilepb -m 64 -kernel linux-3.11/arch/arm/boot/zImage -initrd 
rootfs_qemu.gz   -nographic -serial stdio -append 
"console=ttyAMA0,115200 mem=64M"
 
And that fails with :
CPU: 0 PID: 1 Comm: init Not tainted 3.11.0 #1


Any idea to help me ?


Thank you very much.


Bet regards,

Gilles.