Re: Kernel crash in 2.6.32.6 / bcm1480 with 16k page size

[Guenter Roeck <guenter.roeck@ericsson.com>]

On Sun, Jan 31, 2010 at 04:10:10AM -0500, Maciej W. Rozycki wrote:
> On Fri, 29 Jan 2010, Guenter Roeck wrote:
> 
> > > I suspect you are hitting a maximum valid address bits limit and getting 
> > > the Address Exception.  Limiting VMALLOC_END so that you don't hit the 
> > > limit seems to be the solution.  I don't have the manual for the sibyte, 
> > > so I don't know what the limit is.  The architecture specification 
> > > doesn't state a fixed limit, although it tells what should happen when 
> > > the limit is reached.
> > > 
> > You mean there might be a CPU-specific limit ? I hope not - that would be 
> > quite messy.
> 
>  The size of the address space can be probed via CP0 registers (for MIPS 
> architecture processors that is).  No need to add any CPU dependencies 
> (except from legacy 64-bit MIPS processors perhaps).
> 
That would help. Do you happen to know which CP0 register(s) to look for ? 
I browsed through the MIPS 5K and 20Kc manuals, but didn't find it.

Guenter