Experimental Physics and
Industrial Control System

john sinclair <[email protected]> · Fri, 16 Nov 2001 09:03:07 -0500 (EST)

On Thu, 15 Nov 2001, Andrew Johnson wrote:

> Nick Rees wrote:
> > 
> > While I'm on it, I was using a PowerPC mvme2402 for some of these tests. I
> > am running Tornado 2.0.2. Whenever the PPC reboots it spends ages doing
> > apparently nothing (i.e. about 3 minutes) just before it prints out the
> > Attaching TCP/IP and network interface messages (i.e. very eearly in the
> > boot).
> > 
> > Does anyone have any idea how to get rid of this. It does it twice, so
> > waiting 5-6 minutes every boot is a bit of a bore.
> 
> Yes, reduce the size of any unnecessary memory areas defined in
> sysPhysMemDesc[].  You may have added a large block for VME A32 space,
> which will take the CPU a long time (and lots of memory, about 1K/MB IIRC)
> to set up the page tables for.  Use the sysBatDesc[] table instead for
> large areas, but note that there are only 4 DBATs and they can only cover
> a maximum of 256MB each, so you're limited to a 1GB address range.  We
> only put VME boards in the A32 range 0x80000000-0xbfffffff because of
> this.
> 
> - Andrew
> -- 
> Perfection is reached, not when there is no longer anything to add,
> but when there is no longer anything to take away.
> - Antoine de Saint-Exupery
> 

What is the sysBatDesc[] table and does it exist in the x86 architecture?
Mapping memory for PCI devices via sysPhysMemDesc is similarly       
problematic.

John Sinclair
[email protected]
Oak Ridge National Lab
865-576-6362   865-574-1268 (fax)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System