[issue853] regression: serial console baud rate settings misfeature

[Marc 'Zugschlus' Haber]

New submission from Marc 'Zugschlus' Haber <mh+bts-grml at zugschlus.de>:

Hi,

in previous grml versions, grml tool the baud rate to configure the getty on
the serial console from the console= kernel command line item.

Recently, this has changed and tries to use some automatisms from getty, giving
it multiple baud rates on its command line. The getty man page says that a
Break could be used to change to the next baud rate.

This approach seems to be flawed in at least one of my settings, where the
target box has its serial console connected to a console server of unknown
manufacture which is in turn reachable via ssh, and which configuration I
cannot influence at all. grml serial console=ttyS0,57600n8 shows the boot
messages just fine up until the point when it says "Finished execution of main
grml startup" and the console turns to gibberish. This is the point where the
getty is started, and I guess that it comes up with a baud rate of 115200.

The getty man page suggests that a Break will cause the next baud rate to be
activated, but that doesn't seem to work through that Console server. Neither
Ctrl-@, nor Ctrl-C, nor ~B seem to have the desired effect.

I would suggest going back to the old setup, or at least to offer a possibility
to hard-specify the baud rate from the kernel command line in cases where the
new automatism misfires.

Greetings
Marc

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messages: 3181
nosy: zugschlus
priority: bug
status: unread
title: regression: serial console baud rate settings misfeature

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GRML issue tracker <bts at bts.grml.org>
<http://bts.grml.org/grml/issue853>
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