[Beowulf] non-proprietary IPMI card?
Bogdan.Costescu at iwr.uni-heidelberg.de
Mon Nov 27 16:34:10 EST 2006
On Mon, 27 Nov 2006, David Mathog wrote:
> Also various magic settings in the BIOS and at run time. It's not
> only possible but common for a wake-on-lan card to refuse to WOL
> because the card/CPU isn't in the right state.
Well, Mark didn't suggest for the IPMI card to behave like a WOL one,
just for the power needed to function to be obtained the same way. The
connections to the power/reset switches would take care of turning on
and off the computer.
> some of the bits that enable WOL in the NIC are set by the OS during
> the boot sequence, not by the BIOS.
Some network cards (like 3Com Cyclone and Tornado) have an internal
EEPROM which can contain a set of commands to be executed upon
powering up (well, from the point of view of the card, which might
mean that the computer as a whole is still in a low power mode); these
commands could set the card in WOL mode, IIRC - it's been 3-4 years
since I looked at this...
Something very similar could be done in the BIOS of the mainboards
with on-board NICs (like most NForce 4 ones), as there is already
known which bits at which addresses have to be set. Of course, the
BIOS writers would have to be convinced that this is a good idea... or
maybe OpenBIOS could help.
IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
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E-mail: Bogdan.Costescu at IWR.Uni-Heidelberg.De
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