[BCM4718] Broken interrupts

[Michael Zhilin]

Hi Adrian!

Yes, KDB works. And yes, (today's finding) something is silly that force
make IRQ5 endless. After processing of previous request, next request is
starting. According to mips docs found in google, IRQ5 must be triggered
only if count == compare. In my case, count increments on 0x20000 roughly,
compare is constant. There is another finding: cause register is always
0x8000, even after call mips_wr_compare(). I suppose that this is possible
reason of infinite IRQ5 requests, but still don't know how to fix it...

Thx,
 Michael

On Fri, Mar 4, 2016 at 11:56 AM, Adrian Chadd <adrian.chadd at gmail.com>
wrote:

> hm, does kdb work (ie ,break to debugger at that point), or is the system
> hosed?
>
> is it something silly like it getting stuck servicing interrupts
> because they're not being correctly ACKed?
>
>
>
> -a
>
>
> On 3 March 2016 at 12:22, Michael Zhilin <mizhka at gmail.com> wrote:
> > Hi,
> >
> > I'm trying to load FreeBSD kernel on Broadcom MIPS router (ASUS RT-N16).
> > Here is actual dmesg: http://pastebin.com/AtEz6kc9 . But my actual
> problem
> > is broken interrupts. After enabling of interrupts in
> > autoconf.c:configure_final the MipsException code is called, it works
> fine
> > (including INTRNG), but cpu doesn't return to main thread (suprise!).
> >
> > I can see printf from clockintr, i.e. there are regular timer requests.
> But
> > there is no printf from main thread (autoconf.c) after enabling of
> > interrupts.
> >
> > Also I've tried to simplify MipsException to avoid any issue with
> > saving/restoring registers:
> >     mfc0    k0, MIPS_COP_0_EXC_PC
> >     rfe
> >     jr    k0
> >
> > but still there is no return to main thread.
> >
> > I'm not familiar with JTAG and have no JTAG adapter for debugging. :( To
> be
> > honest, I've lost hope.
> >
> > What could possibly be wrong? Here is github branch for reference:
> > https://github.com/Cka3o4Huk/freebsd/tree/user/mizhka/bcm471x
> >
> > Thank you in advance,
> >  Michael
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