Tyan serial console - how?
becker at scyld.com
Thu Nov 7 17:05:56 EST 2002
On Thu, 7 Nov 2002, David Mathog wrote:
> > Ken Chase wrote:
> > I had massive problems playing with the serial console on linux at
> > anything higher than 9600. Having no flow control is good, but more
> > and more dangerous at higher bitrates.
> Can anybody explain why there no flow control is good? The
> cables in question have all pins, so naively, I would have
> thought that hardware flow control would have been the best choice.
The usual problem is that missing or miswired pins prevent
communication. It's considered better to have a apparently-working
system than nothing at all.
> This BIOS serial console mode really is a dreadful hack.
Ohhhh yeeaahh. The first time I saw it I though "Neat hack. Thank
goodness it will never be on production machines."
It gets worse: guess how IPMI 1.5 based BIOS setup over the network is
done. Hint: the IPMI controller already has wires going to the serial
Still, however ugly internally, IPMI is big step forward for
standards-based cluster hardware management. With the new IPMI
motherboards our next release series will be able to do the following
from the master, even before the OS is running:
Hard power on and off
Configure the BIOS
Check the physical parameters (the usual temp/fans/volts/case open)
Report critical hardware failures e.g. memory failures during count
Monitor the boot as the OS starts
Donald Becker becker at scyld.com
Scyld Computing Corporation http://www.scyld.com
410 Severn Ave. Suite 210 Scyld Beowulf cluster system
Annapolis MD 21403 410-990-9993
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