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violetina
n00b
Joined: 19 Mar 2013
Posts: 2
Location: Belgium
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 Posted: Tue Mar 19, 2013 2:21 pm Post subject: setup qemu-user arm chroot for raspberry pi [SOLVED] |
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(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);
}
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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
n00b
Joined: 19 Mar 2013
Posts: 2
Location: Belgium
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| Posted: Tue Mar 19, 2013 7:25 pm Post subject: Fixed |
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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 
i'm not sure how to close this topic feel free to close it |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54220
Location: 56N 3W
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| Posted: Tue Mar 19, 2013 8:02 pm Post subject: |
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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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