Experimental Physics and
Industrial Control System

Graham Waters <[email protected]> · Thu, 25 Sep 1997 16:17:31 -0700

Holger Jones wrote:
> 
> Hello:
> 
> Anyone used sysNvRamGet/Set for accessing Non-volatile ram under EPICS.
> Issues? Seems like a good place to save critical set-points.
> 
> Holger

Not in epics but I have a stand-alone application using an mvme162 and
vxWorks.
I put standalone vxWorks in flash, and the application + startup script
in nvram
configured as a ram disk ( there is 512k at 0xffe00000). I built vxworks
with the network enabled such that the network was not required for
booting
but is available for downloading upgrades.

I tried this with epics but there is nothing small enough to fit in 512k
of ram disk.
I'm toying with the idea of placing vxWorks/epics in flash, has anybody
tried this.
You would still have to us dbLoadRecords/databases (unless the databases
can be compiled
compressed and linked).so I doubt much boot time would be saved. 

I find that storing set points/calibration tables etc is easier using a
ram disk than trying to manage the memory. You could try creating
a private memory partition with memPartCreate and allocating it with
memPartAlloc.

Graham.

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| Graham Waters, Control System Eng          Internet: [email protected]
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| TRIUMF --- University of British Columbia,	phone: (604)-222-1047   |
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System