Subversion Repositories openrisc_2011-10-31

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#  $Id: README,v 1.2 2001-09-27 12:00:15 chris Exp $

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Notes about the MVME147 bsp

MVME147 port for TNI - Telecom Bretagne

by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr)

May 1996

This bsp is essentially based on the mvme136 bsp.

Summary of the modifications that were made:

 * include

   - bsp.h

      Peripheral Channel Controller memory mapping

      Z8530 memory mapping

 * startup

   - bspstart.c

      main () setup for VME roundrobin mode

              setup for the PCC interrupt vector base

   - bspclean.c

      bsp_cleanup () disable timer 1 & 2 interruptions

   - linkcmds set the RAM start (0x5000) and size (4Meg - 0x5000)

   - setvec.c unchanged

   - sbrk.c unchanged

 * console

   - console.c taken from the dmv152 bsp (Zilog Z8530)

               with no modification

 * clock

   - ckinit.c entirely rewritten for the PCC tick timer 2

 * timer

   - timerisr.s and timer.c

     entirely rewritten for the PCC tick timer 1

     now gives results un 6.25 us units (mininum timer delay,

     suprising big grain)

 * times

   - updated results for the mvme147 (beware of the 6.25 us grain)

 * Makefiles

   - compilation of shmsupp simply removed

To be done:

 * add VMEchip memory mapping to include/bsp.h

 * update the overheads in coverhead.h

 * add support for serila ports 2,3 and 4.

Other notes:

 * There is no MP support (no more shmsupp) because I have no

   experience of the VME bus. The mvme136 shared memory support

   does not seem applicable on the VMEchip of the mvme147, so

   I don't know where to start. Suggestions are welcome.

 * All the timing tests and sp tests have been run except tmoverhd.

   The test hangs during the pause (where the task should be suspended

   until a return). Maybe the rtems_initialize_executive is no more

   reentrant with this bsp.

Future work:

 * Add gdb serial remote support.

 * Shared memory support (I don't really need it, but I can do

   it if it's simple).

 * Message passing on VME bus, with Ada 95 annex E (distributed

   systems) in mind.