Sorry to bother again but I found the solution. maybe it can help someone:

initrd need start and size parameters.
As, size can be bigger then real size of image.cpio.gz, I set it to 32M
like the addpart command.

bootargs="$bootargs initrd=0x72000000,33554432"

--
 <http://www.sevensols.com/>  <http://www.sevensecurity.es>

*Benoit RAT LAMY*

Engineer (Sw) \ Ingeniero (Sw)

fix. *(+34) 958 285 024*

cel. *(+34) 617 989 123*

e-mail: benoit@sevensols.com

*www.sevensols.com / **www.sevensecurity.es*

_________________________________

*C/ Baza, parcela 19 Nave 3  \ Polígono Ind. Juncaril \*

*18210 - PELIGROS - GRANADA –SPAIN*



On Mon, Jun 4, 2012 at 2:21 PM, Benoit RAT <benoit@sevensols.com> wrote:

> Hy everybody,
>
> I was wondering if it was possible to load a cpio.gz image as rootfs! (I
> think it is the kernel that load it so it should not be a problem)
> however I don't know how to pass the arguments.
>
> Here you can find the commands, that i am using:
>
> addpart /dev/mem  8M@0x71000000(kernel);
> tftp zImage /dev/mem.kernel
> addpart /dev/mem  32M@0x72000000(fs)
> tftp image.cpio.gz /dev/mem.fs
> bootargs="$bootargs root=/dev/ram0 initrd=0x72000000"
> bootz /dev/mem.kernel
>
> Regards,
>
> --
>  <http://www.sevensols.com/>  <http://www.sevensecurity.es>
>
> *Benoit RAT LAMY*
>
> Engineer (Sw) \ Ingeniero (Sw)
>
> fix. *(+34) 958 285 024*
>
> cel. *(+34) 617 989 123*
>
> e-mail: benoit@sevensols.com
>
> *www.sevensols.com / **www.sevensecurity.es*
>
> _________________________________
>
> *C/ Baza, parcela 19 Nave 3  \ Polígono Ind. Juncaril \*
>
> *18210 - PELIGROS - GRANADA –SPAIN*
>
>