On 2021-01-16, Marcus MERIGHI <mcmer-open...@tor.at> wrote:
> bast...@durel.org (Bastien Durel), 2021.01.14 (Thu) 18:07 (CET):
>> Le jeudi 14 janvier 2021 à 16:59 +0100, Marcus MERIGHI a écrit :
>> > bast...@durel.org (Bastien Durel), 2021.01.14 (Thu) 16:05 (CET):
>> > > Le jeudi 14 janvier 2021 à 15:47 +0100, Marcus MERIGHI a écrit :
>> > > > bast...@durel.org (Bastien Durel), 2021.01.14 (Thu) 10:20 (CET):
>> > > > > I have a router connected via a serial port to another machine
>> > > > > (which
>> > > > > is usually powered off), wich fails to boot until I connect and
>> > > > > validate the boot> prompt
>> > > > >
>> > > > > I configured my boot.conf as it follows :
>> > > > >
>> > > > > # cat
>> > > > > /etc/boot.conf
>> > > > > set timeout 10
>> > > > > set tty com0
>> > > >
>> > > > I usually have
>> > > >
>> > > > stty com0 115200
>> > > > set tty com0
>> > > > set timeout 2
>> > > >
>> > > > and the machines boot automagically...
>> > > >
>> > > > Marcus
>> > > >
>> > > Actually, it looks like the automagic boot depends on the status of
>> > > the
>> > > attached computer : when it runs, the router boots automagically,
>> > > and
>> > > when it does not, then the boot waits until I press enter (after
>> > > booting it, obviously)
>> >
>> > Ah, I failed on getting what you meant!
>> >
>> > Emitting wild guesses now... As soon as the boot> prompt receives
>> > input,
>> > it cancels the timout counter (and doesn't auto-boot). Could it be
>> > that
>> > your non-auto-booting machine receives something that looks like
>> > input
>> > to the boot> prompt? Can you test with the serial cable detached?
>> >
>>
>> Done that; that's very strange : the router did not auto-boot, but did
>> as soon as I plugged-in the serial cable in (I left minicom running on
>> the other box) (or maybe after a few seconds, I did not checked in real
>> time)
>
> so you have ruled out the second box, good!
>
> Things I'd try...
>
> - any stray empty lines in /etc/boot.conf?
> I'm not saying these would cause any harm, but I'd try
> - add the speed setting ("stty com0 115200")
> - move "set timeout X" to the end
>
> good luck! and please report back if you solve this puzzle!
On some machines you may need to loop back the RS232 control lines.
I normally use a DE9-RJ45 adapter on serial console machines, in most
cases I just connect up RXD TXD GND, but if it's one of those machines
then I'll short CD DTR DSR CTS together (pins 1/4/6/8 on the DE9 side).
