A root= is needed for an install over the network. It needs to get hold of 
install.img from somewhere. Here's my console when I boot from the virtual 
reader and use and internal server to hold the 7.4.1708 image:



RDR FILE 0732 SENT FROM CLCTLR   PUN WAS 0674 RECS 054K CPY  001 B NOHOLD NOKEEP

RDR FILE 0733 SENT FROM CLCTLR   PUN WAS 0675 RECS 0005 CPY  001 B NOHOLD NOKEEP

RDR FILE 0734 SENT FROM CLCTLR   PUN WAS 0676 RECS 399K CPY  001 B NOHOLD NOKEEP

00: I C CLEAR

00:      NO FILES CHANGED

00: Uncompressing Linux...

00: Ok, booting the kernel.

00:

[    0.220768] Initializing cgroup subsys cpuset

[    0.220772] Initializing cgroup subsys cpu

[    0.220774] Initializing cgroup subsys cpuacct

[    0.220781] Linux version 3.10.0-693.el7.s390x 
(mockbu...@clefos-build-image08.bld.sinenomine.net) (gcc version 4.8.5 20150623

(R

ed Hat 4.8.5-11) (GCC) ) #1 SMP Sat Sep 16 05:21:59 EDT 2017

[    0.220791] setup: Linux is running as a z/VM guest operating system in 
64-bit mode

[    0.694918] Zone ranges:

[    0.694925]   DMA      [mem 0x00000000-0x7fffffff]

[    0.694928]   Normal   [mem 0x80000000-0x3ffffffff]

[    0.694931] Movable zone start for each node

[    0.694933] Early memory node ranges

[    0.694936]   node   0: [mem 0x00000000-0x3ffffffff]

[    0.694942] Initmem setup node 0 [mem 0x00000000-0x3ffffffff]

[    0.797912] PERCPU: Embedded 15 pages/cpu @0000000092325000 s24064 r8192 
d29184 u61440

[    0.798098] Built 1 zonelists in Zone order, mobility grouping on.  Total 
pages: 4128768

[    0.798104] Kernel command line: 
root=live:http://192.168.0.1/7.4.1708/images/install.img                        
ramdisk_size=

131

072 cio_ignore=all,!0.0.0009                                    CMSDASD=191 
CMSCONFFILE=TESTING.CONF

ks=http://192.168.0.13/



Note the report of the kernel command line.



Neale



´╗┐On 5/17/18, 16:27, "Linux on 390 Port on behalf of Hamilton, Robert" 
<LINUX-390@VM.MARIST.EDU on behalf of rhamil...@cas.org> wrote:



    There are two generic*.prm files in the iso in the images directory they 
have



    ro ramdisk_size=40000 cio_ignore=all,!condef rd.cmdline=ask (genericdvd)

    ro ramdisk_size=40000 cio_ignore=all,!condef  (generic)



    I started using the support files to IPL in Hercules, and modified the 
generic.prm there to increase the ramdisk_size to 65536.

    I've made one or two other changes to it; once I dropped the cio_ignore 
parameter, and another time I added the rd.cmdline=ask.



    This last time I used your version, verbatim, and ended up with the same 
result, /dev/root does not exist. Sometimes along the way I've gotten 
variations on that theme, /dev/ram0 or /dev/ram1.

    It always ends up stopping after the



        lcs: Loading LCS driver



    message. This particular process runs for 7+ minutes and then stops after 
finding...well, NOT finding a root directory.

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