On Mon, 11 Oct 2010 17:55:07 +0800 "tiejun.chen" <tiejun.c...@windriver.com> wrote:
> david.hag...@gmail.com wrote: > > OK, using 224 as the MPIC interrupt number, and attempting to map it via > > irq_create_mapping(0,224) gives me a kernel seg fault: > > This should not be correct without initialing MSI for MPIC host. As I comment > on > another email, please refer to the file, arch/powerpc/sysdev/fsl_msi.c. The MSI driver is not going to do anything that would change whether that call to irq_create_mapping() works or not. fsl_msi.c would also probably require some changes to be useful in endpoint mode. > > Reading the source (since these calls don't seem to have any other > > documentation), it *looks* like it ought to be valid to call > > irq_create_mapping with a null irq_host *host - which is good, since I > > can't see anything obvious that would give me some other irq_host (again, > > since none of this seems to be documented anywhere). There's mpic stuff in the call trace, so the NULL host was OK. Look in arch/powerpc/platforms/86xx/pic.c. What is the second-to-last parameter of mpc86xx_init_irq() in your kernel tree? It's 256 in current upstream -- this is the number of IRQ sources the MPIC driver will handle. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
