Basic questions re RTEMS and PPCbug

[David Hamilton]

I'm inexperienced at working at the BSP/RTOS level and have some basic gaps
in my understanding of RTEMS (I'm used to working with VxWorks).
I have downloaded and compiled RTEMS for the MVME2307 board (closest thing
to my MVME2400 and MVME2700 boards) and am trying to understand what I've
got.

I seem to have a number of executables in /opt/rtems/mvme2307/samples (eg
hello.exe etc.), but nothing looking like an OS. Is RTEMS linked (or at
least the elements of it that are required) to the application? In that
case, am I right in understanding that there is no shell associated with
RTEMS.

As I said, I have MVME2400 and MVME2700 boards. I've never used PPCbug
before, so have just started trying to get to grips with it. Anyway, I'm
trying to see if any of the MVME2307 samples will work on either board.
I've configured the network with NIOT and changed ENV settings according to
README.MVME2300.
I then load hello.exe (and others) using NIOP, and it seems to get
transferred ok.
I try running the programe using GO but always get an INVALID error at the
first address.

Due to my inexperience, I'm not sure if the problem is due to
incompatibilities between the MVME2307 bsp and my boards (although I think
the MVME2700 is really quite close to the MVME2300 series), or whether I'm
actually screwing up with my PPCbug commands.

It is difficult at the beginning to get a foothold. 
Any advice would be welcome,
David