Initramfs and root space

Hi,

I try to boot from ethernet my own Linux FS :

- create an initramfs with a simple and very minimal fedora structure : ok
- boot with DHCP with a 2.6 kernel : ok
- kernel load the initramfs : ok
- a custom init.sh script is call : ok

So after the boot I have a Linux OS with an initramfs as filesystem.

With the initramfs, I have compiled some minimal applications.

The aim of this minimal boot is to make things without to have to mount
a hard disk or another filesystem.

My problem is that some applications, like mail, complain that disk
space is insuficient, and of course, df / result :

df /
Filesystem           1K-blocks      Used Available Use% Mounted on
-                            0         0         0   -  /

So, how to make the initramfs have a mountpoint with a real capacity
(capacity = RAM capacity ?)

Thanks for any help

Yves


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