MPC8240 EPIC Driver (Attached)

Andrew Johnson anj at
Tue Aug 14 05:56:08 EST 2001

"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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