AlphaStation 200 NVRAM Problem

Robert Jarratt robert.jarratt at
Mon Apr 25 17:37:23 CDT 2016

> -----Original Message-----
> From: cctech [mailto:cctech-bounces at] On Behalf Of Maciej
> W. Rozycki
> Sent: 25 April 2016 14:29
> To: General Discussion: On-Topic Posts <cctech at>
> Subject: RE: AlphaStation 200 NVRAM Problem
> On Sun, 24 Apr 2016, Maciej W. Rozycki wrote:
> > > The thing
> > > I am struggling with at the moment is getting sys$crmpsc_pfn_64 to
> > > work so I can use C to test the NVRAM. I seem to have a problem with
> > > the service writing back the address and length, but I don't yet know
> why.
> >
> >  That's beyond my abilities I'm afraid, can't help.
>  Ah, BTW, a general note: make sure you request an uncached mapping, if
> your interface has such control, mark your pointers `volatile' and use
> appropriate synchronisation barriers between accesses.
>   Maciej

To help me work out why my program isn't working I went back to the console
command to try to write to the flashbus index register, I used the following

     deposit -l pmem:100000000 94000000

This should set up the flashbus register to write to the LEDs. Instead I got
a machine check and an "Illegal target address".

Am I misunderstanding the technical manual? Are those addresses it gives for
the flashbus registers physical addresses?



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