On Tue, Nov 13, 2001 at 07:29:00PM +0100, Wolfgang Denk wrote:
> In message <20011113072253.A4515@hq2> Victor Yodaiken wrote:
> >
> > Can you explain what you would like to happen?
> 
> Try running normal ethernet on a SCC, handled by  Linux,  and  assign
> another  frequent  interrupt (for instance a CPM timer) to be handled
> by a RT task and you will know what he means.

We don't support 860 in OpenRTL yet [although patches would be
welcomed],  but we do support 860 for customers and I don't
see a problem with doing exactly what you propose.
I still don't understand the technical issue if there is one.

> > BTW: as I understand it, PPC Linux does have a "flat" model with the 
> > low level code reaching out to determine which  device is responsible
> > by looking at the second level  interrupt controller.
> 
> PPC Linux uses one function to register an  interrupt  on  SIU  level
> (request_8xxirq()),  and  another  to  register  interrupt on the CPM
> (cpm_install_handler()).
> 
> This is NOT a flat model.

Linux does map all interrupts onto a flat model: you don't have to use
cpm_install_handler I believe.




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