disabling all serial input / output at boot time

[Bernd Walter]

On Thu, Apr 15, 2010 at 09:04:05PM +0200, Bernd Walter wrote:
> On Thu, Apr 15, 2010 at 01:45:36PM -0400, Mike Tancsa wrote:
> > At 01:36 PM 4/15/2010, Bernd Walter wrote:
> > 
> > >Is the sensor prohibiting the use of USB RS232 in any way?
> > 
> > Just our wallets :)  Extra cost to include it and the case would need 
> > to change as well as its in an environment where it can get hit by water.
> 
> Ok - that's an understandable reason.
> 
> The unfortunate thing is that the bootcode reacts on buffered input
> and the BIOS might already have buffered some bytes.
> This has nothing to do with FreeBSDs knowledge about comconsole because
> the BIOS translates it.
> IIRC the Soekris BIOS has an option to disable the SIO support, maybe
> your board has something similar.
> Otherwise this means you need to disable the bootcode (including boot0)
> to process any kind of input.

Ups - I  ment boot2 and not boot0 - you likely don't install boot0.

> This shouldn't be too hard to code since the code is well documented.
> It happens in at least boot0 and loader - the later likely can be
> handled by using a customized loader.rc script, which wraps to
> nullconsole.
> 
> -- 
> B.Walter <bernd at bwct.de> http://www.bwct.de
> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.