Assumptions:
============

0. A partition is a set of nodes

1. A clock-partition is a set of boards sharing all the same clock
   provided by one HIB.

2. Each clock-partition has at least one root-HIB providing the clock

3. The setting of the HIB's clock register (0x80C have) to be done
   per clock-partition configurations.

   For example, if I have the following clock-partition machines:
    - 2 crates (CRATE0 and CRATE1)
    - 1 rack   (RACK1)
   The administrator have to configure the machines as follow:
    - dnosem -crate 0 -setclock VALUE
    - dnosem -crate 1 -setclock VALUE
    - dnosem -rack  0 -setclock VALUE

4. Each root-HIB providing the clock must have defined the value of
   register 0x80C in the configuration file.

Implementation of option "-setclock":
====================================

1. Using option "-setclock" set the value of all registers of all
   HIBs (root-HIB and board-HIB) included in the partition
   allocated. According to assumption (3) the partition should be a
   clock-partition.

2. If one clock-partition containes more the one root-HIB nose assume that
   providing the clock is the HIB0 (by definition the HIB attached to ROOT0)
   if the value of clock-register is present in the configuration file.
   Otherwise it assume that should be HIB1 or HIB2 or ...