Bug#340508: missing modules on s390/s390x

[Ivan Warren <ivan@vmfacility.fr>]

>
> Only problem was that the network interface did not come up. Trying to
> manually start it resulted in:
> # ifup eth0
> Ignoring unknown interface eth0=eth0.
>
> This looks like an issue related to udev persistent device naming.
>
> Further info:
> - The ctc module was loaded:
> # lsmod
> Module                  Size  Used by
> ctc                    79648  0
> fsm                    12544  1 ctc
> cu3088                 12292  1 ctc
> ccwgroup               15104  1 cu3088
> dcssblk                20504  0
> dasd_fba_mod           17408  0
> dasd_eckd_mod         109824  6
> dasd_mod               79924  8 dasd_fba_mod,dasd_eckd_mod
>
> - Network config is a basic static configuration; from
>   /etc/network/interfaces:
> auto ctc0
> iface ctc0 inet static
>         address 10.19.92.1
>         [...]
>

... For Info ....

I had to add a file such as this to /etc/network/if-pre-up.d :

ctc0 :
**********
#!/bin/sh
exec > /dev/null 2>&1
echo "0.0.0400,0.0.0401" > /sys/bus/ccwgroup/drivers/ctc/group
echo "1" > /sys/bus/ccwgroup/devices/0.0.0400/online
**********

(it's a dual CTC link at CCUU 0400 & 0401)

Apparently this needs to be done so as to indicate the grouping 
(CCUU/CCUU+1 was probably implicit in 2.4).

I had to do this some time ago when I switched to 2.6 and I think it was 
Bastian who told me this.

Note that for the 1st time, since the update to klibc 1.2.4-1, I've been 
able to complete a 2.6.15 kernel IPL (I suspect the issue was a problem 
with pivot_root). Now also I had to change the parm line and /etc/fstab 
due to the change in the DASD naming convention from the devfs 
(/dev/dasd/0.LCSS.CCUU/partn) to the udev naming convention (/dev/dasdXY))

--Ivan