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setup qemu-user arm chroot for raspberry pi [SOLVED]
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violetina
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Joined: 19 Mar 2013
Posts: 2
Location: Belgium

PostPosted: Tue Mar 19, 2013 2:21 pm    Post subject: setup qemu-user arm chroot for raspberry pi [SOLVED] Reply with quote

(violetina root #is the rootfs I rsyncd from gentoo on raspberry pi)

I build
Code:
USE=static emerge -b1av app-emulation/qemu-user



Code:
 echo   ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff:/qemu-wrapper:P' > /proc/sys/fs/binfmt_misc/register


violetina root # cat /proc/sys/fs/binfmt_misc/arm
enabled
interpreter /qemu-wrapper
flags:
offset 0
magic 7f454c4601010100000000000000000002002800
mask ffffffffffffff00fffffffffffffffffeffffff


Code:
ROOT="/mnt/MEDIA/RASPIGEN/root/" emerge -K qemu-user
(to install the bin in the target)

next I make the wrapper for qemu
violetina root # cat qemu-wrapper.c

#include <string.h>
#include <unistd.h>

Code:
int main(int argc, char **argv, char **envp) {
   char *newargv[argc + 3];
 
   newargv[0] = argv[0];
   newargv[1] = "-cpu";
   newargv[2] = "arm1176";
 
   memcpy(&newargv[3], &argv[1], sizeof(*argv) * (argc - 1));
   newargv[argc + 2] = NULL;
   return execve("/usr/bin/qemu-arm", newargv, envp);
}


I run
Code:
gcc  -static qemu-wrapper.c -O3 -s -o qemu-wrapper  to build the  wrapper bin



I try to chroot needed stuff is mounted

proc on /mnt/MEDIA/RASPIGEN/root/proc type proc (rw)
sysfs on /mnt/MEDIA/RASPIGEN/root/sys type sysfs (rw)
/dev on /mnt/MEDIA/RASPIGEN/root/dev type none (rw,bind)

Code:
[b]violetina root # chroot . /bin/bash
/bin/bash: error while loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory[/b]


Last edited by violetina on Tue Mar 19, 2013 7:31 pm; edited 2 times in total
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violetina
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Joined: 19 Mar 2013
Posts: 2
Location: Belgium

PostPosted: Tue Mar 19, 2013 7:25 pm    Post subject: Fixed Reply with quote

I followed http://www.gentoo.org/proj/en/base/embedded/handbook/?part=1&chap=5 , but it seems all that is not really needed , and the ROOT=$PWD/ emerge -K qemu-user to install the bin in the chrrot messed up ldconfig , running ldconfig in the chroot root again fixed it , then i found that qemu-user also installs /etc/init.d/qemu-binfmt , which can set up the binfmt , only thing to do is start the init script (make sure its build with right user mode use) copy the qemu-static-arm-binfmt and qemu-static-arm from host to the chroot rootfs , then all is set up to chroot :D


i'm not sure how to close this topic feel free to close it
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 32108
Location: 56N 3W

PostPosted: Tue Mar 19, 2013 8:02 pm    Post subject: Reply with quote

violetina,

Welocme to the forums.

You may edit the title in your original post if you wish to add [solved] or [closed] or whatever.
Set up cross distcc for your Pi. Its much faster than an emulated ARM CPU.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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