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"

--
 

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,

--
 

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