On Wed, 22 Dec 1999, Daniel C. Sobral wrote:
> Justin Hawkins wrote:
> >
> > I think (I am not positive on this) that if the boot loader talks to a
> > modem in command mode with echo on, it gets confused and won't boot any
> > further. Is this a known problem?
>
> I'd say this is an expected result, not a known problem. It is doing
> exactly what it is being told to (gibberish). Junk in, junk out. :-)
>
You'll just turn off echo in the modem.
ATZ
ATE0
AT&W
> > Is there enough room in there for some code, which checks for this? IE if
> > the first line output to the serial device == the first input (some
> > version string probably) then it just ignores it and does the default
> > action?
>
> Just configure it correctly. Don't tell it to talk to a serial device
> that will be sending it gibberish.
>
A hack would be to have the loader emit ATE0 to protect itself from
echoing modems.
Another, but perhaps annoying would be flushing the input buffer before
each read.
Leif
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