Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 15 Sep 1999 17:09:11 -0500

Jens Eden wrote:
> 
> We tried various cards in different crates and this only happens if the
> card has base address 0xc000, even if there are no other cards in the
> crate.
> Anyone an idea, what this could be?

This may be the same address as your CPU's mailbox interrupt registers, a
clash of which might cause strange things to happen.  What is your CPU
architecture?  If it's an mv162 or mv167, check the definition of
GCSR_GROUP_ADDR in <vw>/config/<arch>/config.h which defines the high byte
of the mailbox address in A16 space - I vaguely recall that the default
for this is 0xc0, which would put processor 0's mailbox at 0xc000.  Other
CPU types may have a similar mailbox area - SM_INT_ARG2 in the same
config.h file points to this address (as long as SM_INT_TYPE is defined as
SM_INT_MAILBOX_1, the address space is given in SM_INT_ARG1).

- Andrew
-- 
Complexity comes for free, Simplicity you have to work for.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System