Re: [PATCH 2/4] powerpc/mpic: Use the MPIC_LARGE_VECTORS flag for FSL MPIC.

On Tue, Mar 27, 2012 at 8:30 AM, Kumar Gala [off-list ref] wrote:

On Mar 27, 2012, at 7:15 AM, Varun Sethi wrote:

quoted

FSL MPIC supports 16 bit vectors so our vector number space isn't
restricted to 256 vectors. We should use the MPIC_LARG_VECTORS flag
while intializing the MPIC. This also prevents us from eating in to
hardware vector number space (MSIs) while setting up internal sources.

What is driving this change?

Whats driving the change is proper handling of error interrupts.   Right
now error interrupts (muxed on int 16) are treated as a shared
interrupt source.   We want each to be handled as a individual interrupt
source...thus the desire to support more than 256 interrupts.

Stuart