I may have a clue (you might not think so, but...):
I've configured the init thusly:
mpic1 = mpic_alloc(np, res.start,
MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN ,
0, 256,
" MPIC ");
Which, as I read the code, should disable the ISU stuff.
I've seeing this on boot:
mpic: Setting up MPIC " MPIC " version 1.2 at e0040000, max 2 CPUs
mpic: ISU size: 88, shift: 7, mask: 7f
mpic: Initializing for 88 sources
Now, since the interrupt number I want is 224, which, last time I checked,
was > 88, this may be the root cause.
As I read the code:
/* Read feature register, calculate num CPUs and, for non-ISU
* MPICs, num sources as well. On ISU MPICs, sources are counted
* as ISUs are added
*/
greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
>> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
if (isu_size == 0)
mpic->num_sources =
((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
So it would seem to me that the "greg_feature" is saying I have 88
interrupts.
I've tried setting the ISU size to 256:
mpic1 = mpic_alloc(np, res.start,
MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN ,
256, 256,
" MPIC ");
And that kills the kernel as we init the mpic.
SO, I guess the question in, what sets "greg_feature", as it would seem to
be incorrect.
Or, am I on the wrong trail?
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