[Bug 188899] [cas] cas ethernet driver seems to have issues with some multiport card and mother board combinations

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188899

Pyun YongHyeon <yongari at FreeBSD.org> changed:

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                 CC|                            |yongari at FreeBSD.org

--- Comment #9 from Pyun YongHyeon <yongari at FreeBSD.org> ---
(In reply to Marius Strobl from comment #6)
Marius,
I was able to see 'cannot disable RX MAC' message in the attachment
so I vaguely guess it could be related with incomplete controller
reset.  It seems Linux sets soft_bit_0 of CAS_BIM_LDEV_OEN register
to force a PCI reset for old Cassini before resetting other blocks.
Another thing to try is to bypass MAC/DMA stop and directly issue
reset in device attach phase. I guess some of those blocks may not
be in sane state before the reset so relying on some bits of
CAS_RX_CONF register shall trigger other issues.
I was not able to find old cas(4) controller so I couldn't test
above approach though.  Marius do you other clue?

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