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82599 EICR bits

GKnit
Beginner
‎02-29-2012 05:27 AM
1,406 Views

Hi,

I'm trying to understand the 82599 chip, and I'd have a question concerning interrupts.

The data sheet (Revision: 2.74) marks bit 31 in EICR as "reserved", but the Linux driver

source defines it as

# define IXGBE_EICR_OTHER 0x80000000 /* Interrupt Cause Active */

I saw in the interrupt service routine that sometimes this bit is set when an interrupt

occurs, and sometimes it is reset. This applies to the same cause, for example

link status change (LSC).

Can somebody explain the meaning of this bit?

Thanks

Gunter

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