Re: Problems starting init on a SH7750R based board

[Paul M. <le...@li...>]

On Sat, Oct 27, 2007 at 08:19:54AM +0200, Heiko Schocher wrote:
> After this I get an Intevent 0x1e0, and then nothing more works ...
> 
> 1) Has somebody here an idea, where this intevent come from? How I can 
> prevent it?
> 
It sounds like something is generating an interrupt that you aren't
acking, for some reason it isn't being caught as spurious and disabled,
and you are hanging as a result. If you want to hack around it, you can 

> BTW:
> 4) I think the generic_irq_demux funktion dont work nice, if I get such 
> an eventvector,
>     the resulting irq is 0x7ffffff, and irq is used as an index in 
> generic_handle_irq()
>         struct irq_desc *desc = irq_desc + irq;
>     , and + 0x7ffffff is somewhere in the RAM, thats not good.
> 
This is rather curious. EVT 0x1e0 implies IRQ -1, and you've simply
wrapped, that shouldn't happen. You shouldn't even be entering the
do_IRQ() path here, are you certain that this is an INTEVT value rather
than an EXPEVT one?

You may also want to register a dummy handler at that EVT slot using
set_exception_table_evt() (you probably also want to invalidate the
I-cache for sanity after doing so), and see what falls out. That's
certainly not a valid IRQ vector.