On 12.01.15 21:08, Peter Maydell wrote: > On 12 January 2015 at 17:38, Alexander Graf <ag...@suse.de> wrote: >> I'd prefer to keep things as easy as we humanly can for now. Then add >> MSI. And if we then realize that we still need 4 rather than 1 shared >> interrupt lines we can still change it :) > > Except that that would be a breaking change, so I would prefer > to think ahead where possible; at some point there will come > a time when we really can't make breaking changes to this > board any more...
Works for me, then we stay at a single interrupt line. The only reason we have 4 in PCI is that back in the day you could have non-sharing PCI devices that were essentially ISA ones. If you actually care about interrupt latency and performance you will want more than 4 IRQ lines, so you'll want MSI. Alex
