[parisc-linux] EISA interrupts

[Matthew Wilcox]

To get ISA/EISA interrupts working, I think we're going to need to
program the 82357 ISP chip properly.  You don't need any knowledge of
the Mongoose/Wax chip to do this; all you need to know is that the byte
read from 0xfc01f000 in eisa_irq is the byte generated by the 82357.
Any volunteers?  It should be straightforward, but I don't have time to
do it myself.  The data sheet's linked to from the p-l.org documentation
page.

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