I am reasonably certain this doesn't happen on (some?) sparc hardware. I've had an Ultra30 plugged into our E450 via serial, and when I rebooted it, I don't recall finding the E450 at PROM later.
I could be wrong, of course. On Sun, Jan 11, 2004 at 03:54:17AM -0800, [EMAIL PROTECTED] said: > Date: Sun, 11 Jan 2004 03:54:17 -0800 > From: [EMAIL PROTECTED] > To: bath66 <[EMAIL PROTECTED]> > Cc: Andrew Sharp <[EMAIL PROTECTED]>, [email protected] > Subject: Re: Problem with "Happy Meal" drivers > User-Agent: Mutt/1.3.28i > X-Spam-Status: No, hits=0.3 required=4.0 tests=NO_REAL_NAME autolearn=no > version=2.60 > X-Spam-Level: > > On Sun, Jan 11, 2004 at 08:58:17AM +0100, bath66 wrote: > > "Andrew Sharp" <[EMAIL PROTECTED]> was quoted as saying by some wrong mail > > agent > > operated by Mr. bath66 who should know better > > > > > > Before you turn off the PC that is connected to the Sun's serial > > > console, remove the cable from the sun. That way, the sun will stay > > > running and you won't have these problems. > > > > > Thanks for the conseil .. It work now ... but can you explain me why ? > > A break signal on the sun serial port drops it into the openboot prompt. > 'go' restarts it where it left off. > > In rs232 a break is signaled by holding the line low for longer than > 10 bit times (therefore it cannot be a valid byte b/c a valid byte > would have ended with a high stop bit at the 9th bit[1]). > > Some PCs inadvertently drive TX low for that long as power goes down. > There isn't much you can do; I even tried lowering the baud rate > and even as 1200 the PC's signal was long enough to act as a break. > > -Nicolas Dade > > [1] assuming 8N1; the principal is the same with other data settings--- > a break is unambiguously not a data transfer > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > -- Mike Edwards <[EMAIL PROTECTED]> System Administrator Psychology Department, Rutgers University, Newark campus 973-353-5440 x246
