Patch-ID# 100023-01
Keywords:	panic iechkcca ether ethernet ie sun4
Synopsis:Sun-4 systems may panic with iechkcca errors.
Date: 26-Jun-89

SunOS release:
	4.0.3

Bug ID's fixed with this patch:
	1014717

Patches which conflict with this patch:

Architectures for which this patch is available:
	sun4

Obsoleted by:
	4.1

Problem description:

        In 4.0.3, a machine will panic with "iechkcca" if the 
        82586 (ie) chip does not clear it's command register within 
        an expected "time frame".   In general, system panics of 
        this type have most often been found to be the result of
        network problems (e.g., a bad transceiver, DELNI box, or
        ethernet cable) or other hardware problems (e.g., a bad or badly
        configured disc controller) on the system itself.

        A bug has been identified in the 4.0.3 ie driver which
        causes the "time frame" mentioned above to be shorter 
        on a sun-4 than on a sun-3.  And, that is, of course, shorter 
        than had been intended.  This patch correctly adjusts the 
        timer.

        In addition, this patch attempts to reset the chip up to 
        three times, if the time limit expires before the command 
        register is cleared.

        It is important to note that that this fix may not have
        any affect on iechkcca panics which are a result of the 
        types of possible network and/or hardware problems indicated
        above.