i resolved that thanks to your help
but now i can't connect to my add-hoc hotspot with the new rootfs , can you help-me?

Wifi should work out-of-the-box, did you use wifi-menu? Or rather - what is wrong?
BTW: do you use IRC? I would rather help you on #maemo-alternatives@irc.freenode.net, not to make too much offtopic posts here.

rfkill: cannot open RFKILL control device

None, command line suits my arch needs. In ED, I use LXDE nested (xephyr).

/Estel

i think my wi/fi is connecting but when I issue the ping to a adress unknown host came , also pacman not working when i try to download packages, some hints?

i managed to get it working chrooing from a partition , but when i start xfce4 is shows mex w x window server is already active for display 0*(using slim) , any hints how to open gui on xephir?

Do you have Xephyr for Maemo? Anyway, you can run it as usual:
Xephyr :2 &
DISPLAY=:2 startxfce4
Probably you do not need to run Xephyr at all, just try to run 'export DISPLAY=:0' and then run applications you want (may not work for window managers).

thanks it worked ,
but how to mount MyDocs in arch when booting with u-boot?
tried and retried editing fstab(dev mmcblk1p1) without succes
now i managed to have xfce , swap , powervr and other in u-boot
but i have seen a screen where someone mounted mydocs in arch , any help?

You should change one thing in the way you ask for help - do not limit yourself to simple message "does not work". We need some more informations to help you. It is much better when you write "I added the following line: .... to the /etc/fstab, but after issuing 'mount -a' command, it returned the error xxx". After such message, there are more people eager to help you, as they may already know the solution instead of asking for details (like I am going to do right now, but not many times again). Also, if you find the solution yourself - put it here, there may be more people with the same problems as you had. Then they can use your experience to solve their problems instead of asking same questions again and again.
It depends if you booted Arch or just chrooted, because the eMMC memory shows up as /dev/mmcblk0 in Maemo and /dev/mmcblk1 in Arch. If you booted Arch, it is enough to:
# mount /dev/mmcblk1p1 /mnt/mounpoint
and if you want to have it in fstab, there is the appropriate line:
/dev/mmcblk1p1 /mnt/mountpoint vfat defaults 0 0

fixed , reading arch forums
the problem i have now: no sound
rx51-audio rx51-audio : asoc: failed to init TLV32AIC34 : -19
asoc : failed to initiate card RX-51 : -19
rx51-audio rx51-audio: snd_soc_register_card failed (-19)