EPICS Re: epics on alphas

Experimental Physics and Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: epics on alphas
From:	[email protected] (Jeff Hill)
Date:	Mon, 12 Dec 94 15:32:42 MST

> > > 
> > > Mark Anderson has done some work to have the Epics display client and
> > > the channel access work on a alpha under osf/1.  He says that other 
> > > groups also plan to use this platform and that perhaps it would be
> > > supported (generally?) in Epics 3.12.  Could you tell me what exists and
> > > if this is to be included or supported?  There is some possibility that
> > > we may be interested but only if there is active use and support out there
> > > somewhere.
> > > 
> > > Thanks,
> > > Ralph Johnson
> > > 

I made the necessary changes to support the alpha in the CA 
client library for R3.12. Mark's port required the truncated
address space compiler option. R3.12beta does not suffer from
this restriction.

Client side applications that use EPICS type DBR_LONG and pass the 
address of a C "long" directly to the CA API will need to be recoded 
to declare their DBR_LONG variable with type "dbr_long_t" (if they 
wish to operate correctly on the alpha). This is because all
C types are identical between 32 bit machines and the alpha
excepting the C type long which lengthens to 64 bits.

The use of architecture independent types to declare process variable 
values read/written through the CA API is highly recommended in the 
future.

Tony Carter at MIT is currently testing the 3.12beta alpha/osf port.

Jeff


______________________________________________________________________
Jeffrey O. Hill			Internet	[email protected]
LANL MS H820			Voice		505 665 1831
Los Alamos, NM USA 87545	FAX		505 665 5107

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