Re: MPC8240 EPIC Driver (Attached)

"Mark A. Greer" wrote:

The changes to the openpic code for supporting serial interrupt mode are very minor.

Actually IIRC they're already present in the version shipped with
HHL-2.0.  I don't remember making any changes for that at all on the
MVME2100 support, but my memory has been known to be faulty.

What I mean is a table where you specify the irq, the offset fo the regs from the base
address, the sensitivity, and the polarity all separately.  Also the appropriate
extensions to support serial interrupt mode (e.g., MVME2100 uses that).  With a table
format something like that, you can avoid the sparse and negative irq's on the
8240/107 and still keep things pretty clean looking.

That sounds right.  It could also use the NIRQ field of the Feature
Reporting Register to cross-check that the table given is the correct size
for the chip it's controlling, and have some way of specifying the
presence or absensce of a cascaded i8259 (presumably with its own table).

- Andrew
--
The world is such a cheerful place when viewed from upside-down
It makes a rise of every fall, a smile of every frown

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