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Date:      Wed, 14 Jun 2000 10:28:48 -0600
From:      Warner Losh <imp@village.org>
To:        "Brech, Cary" <CBrech@kenan.com>, freebsd-hackers@FreeBSD.ORG, mblott@lucent.com, "Savio, Florie N" <fsavio@lucent.com>
Cc:        Alfred Perlstein <bright@wintelcom.net>, freebsd-questions@FreeBSD.ORG
Subject:   Re: FreeBSD Support of Hot Swappable NICs 
Message-ID:  <200006141628.KAA21967@harmony.village.org>
In-Reply-To: Your message of "Wed, 07 Jun 2000 17:07:19 CDT." <20000607170719.A24836@dan.emsphone.com> 
References:  <20000607170719.A24836@dan.emsphone.com>  

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In message <20000607170719.A24836@dan.emsphone.com> Dan Nelson writes:
: In-Reply-To: <20000607114158.C17973@fw.wintelcom.net>; from "Alfred Perlstein" on Wed Jun  7 11:41:59 GMT 2000
: X-OS: FreeBSD 5.0-CURRENT
: 
: In the last episode (Jun 07), Alfred Perlstein said:
: > Brech, Cary <CBrech@kenan.com> [000607 10:33] wrote:
: > > Lucent recently introduced a product that uses FreeBSD as its OS. 
: > > We are currently contemplating adding the ability to "Hot Swap" the
: > > custom network interface cards we are developing for the next
: > > release.  The question we have is does FreeBSD support the ability
: > > to hot swap network interface cards?
: > > 
: > > Thanks in advance for your assistance!
: > 
: > We can do pcmcia hot swap, but it gets hairy if the interface is
: > in use, the interface should be 'downed' before removing afaik.
: 
: Or do you mean PCI hot-plug?  FreeBSD currently doesn't support
: powering off PCI slots or re-probing the PCI bus after bootup, both of
: which are required for hot-plug.  I don't know how hard it would be to
: add, either.  You'll probably have to ask -hackers about that (cc and
: reply-to reset there).

The compact PCI hot swap spec isn't implemented in FreeBSD at this
time.  The compact PCI cards will work w/o the hot swap stuff just
fine.  The hot swap spec doesn't include a register set to program to, 
as far as I could tell in my limited researches, so each chipset needs 
its own driver to add hot swap capibilities.

Warner


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