Re: [linuxdc-dev]AICA interrupts

[M. R. B. <mr...@0x...>]

* Adrian McMenamin <ad...@mc...> on Tue, Jan 01, 2002:

> I am experimenting with the AICA interrupt - HW_EVENT_AICA_SYS - but I am=
=20
> getting odd results:
>=20
>=20
[...]
> When this runs every call to writel(0x20, 0xa07028b8) appears to generate=
=20
> "unexpected IRQ trap at vector 0b" (though system output otherwise is nor=
mal).
>=20
> What have I done wrong?
>=20

I don't understand why you're getting the "unexpected IRQ ..." message, the
DC interrupt-handling code switches off of SH4 IRQ's 9, 11, and 13, so they
should always be "expected" and return the virtual IRQ.  See
arch/sh/kernel/setup_dc.c::systemasic_irq_demux() for more info.

The only other thing I can think of is that the DC machine vector (machvec)
isn't being selected, and that can only happen if you forget to set the
machine type as "Dreamcast" when configuring the kernel.

Can you check /proc/interrupts to see what interrupts are being handled
(PVR2, gdrom, BBA, etc.), and attach your dmesg output?

M. R.