On Thu, Sep 13, 2018 at 5:30 PM Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> wrote: > > On 13/09/18 15:21, Artyom Tarasenko wrote: > > > On Sat, Sep 8, 2018 at 11:11 AM Mark Cave-Ayland > > <mark.cave-ayl...@ilande.co.uk> wrote: > >> > >> Whilst the PReP specification describes how all PCI IRQs are routed via IRQ > >> 15 on the interrupt controller, the real 40p machine has routing quirk in > >> that the LSI SCSI device is routed to IRQ 13. > > > > Is it a routing quirk or does 40p use both 15 and 13? > > I used both in my AIX experiments and AIX seemed to be happy about it. > > But maybe AIX simply doesn't care as long as the residual data is correct. > > > > Artyom > > If you boot the Linux sandalfoot zImage then you can see the LSI IRQ > change from 15 to 13 just by changing the model name in OpenBIOS to > match that of a real 40p (compare with > http://www.juneau-lug.org/sandalfoot.php). There's also similar code > that you can see in NetBSD. > > My guess would be that AIX does the "right thing" and parses the > residual data correctly as expected.
This does indeed make sense. Reviewed-by: Artyom Tarasenko <atar4q...@gmail.com> -- Regards, Artyom Tarasenko SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu
