At the initially boot of the QNX4 image OS start program boot -v, which gives line
 
726MHz 1586/1587 PCI bus boot modules:...
 
What mean every  part of this line:
 
- 726MHz ?
- 1586/1587 ?
- PCI bus ?
 
Some time we have a problem and get this line like

7MHz 1586/1587 PCI bus boot modules

or

10MHz 1586/1587 PCI bus boot modules
 
and QNX4 is not loaded. 

Here with previous messages BIOS about checking the memory and about list device on PCI-bus looks normally.
 
Is this hardware or software problem? 

Now in use version of boot program  from 07-Aug-98. Is it necessary to update boot program from 20-02-2007?
 
Thank you.