Date: Thu, 15 Apr 2010 13:23:12 -0400 From: Mike Tancsa <mike@sentex.net> To: Julian Elischer <julian@elischer.org> Cc: freebsd-hackers@freebsd.org, perryh@pluto.rain.com Subject: Re: disabling all serial input / output at boot time Message-ID: <201004151723.o3FHN9Ei076949@lava.sentex.ca> In-Reply-To: <4BC73C56.4080105@elischer.org> References: <201004141357.o3EDvuxt067902@lava.sentex.ca> <4bc6905e.9tkYBdShtBRdGu5Q%perryh@pluto.rain.com> <201004151003.o3FA3886074754@lava.sentex.ca> <4BC73C56.4080105@elischer.org>
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At 12:18 PM 4/15/2010, Julian Elischer wrote:
>>>More of a workaround than a fix, but does it work any better
>>>if you connect the device to com2 instead of com1?
>>
>>
>>Unfortunately there is only one serial port on the board we are using.
>
>yes but can the bios map it to be com2?
The BIOS (Alix) is very "helpful" in that anything that boot0 (and I
think boot2) prints out, it just puts it out the one serial port. So
even if I install boot0 and not boot0sio, I still get "stuff" on the
one serial port. (Same with spinconsole from current) Similarly, I
can compile a kernel sans uart and then load uart once things are
fully booted. However, there is still output on the serial port
(which I guess was destined for the console), so it does not seem to
be an issue with FreeBSD's kernel as the input/output takes place
prior to that. I can disable serial output in the BIOS, but the
problem is sometimes that gets factory reset in the field... Also, we
are doing a few hundred of these things so invariably a few will be
missed etc. So I would rather have an extra layer of protection to
deal with it at the OS layer, not to mention I dont want any output
that confuses the device I am to monitor.
---Mike
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ario Canada www.sentex.net/mike
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