[parisc-linux] EISA support

[Grant Grundler]

Matthew Wilcox wrote:
> I have a plan to allocate Mongoose's IRQ in a nicer way, but that will
> have to wait until tomorrow.  What do you think the best way would be
> to fix EISA card IRQs?  I have a couple of thoughts:
> 
>  * Introduce a new EISA_IRQ_BASE macro that most architectures
>    define to 0.

I don't know what other archs do or how hard that would be to drive
into the other arches.

>  * Reserve IRQ region 0 for EISA

reserve IRQ region 0 for EISA.
It's reserved now to catch broken PCI drivers that treat the IRQ number
as a byte instead of an int. So for machines w/o EISA, it could
continue to remain reserved for that purpose.

grant