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
