Re: [jornada] Linux for 568 [off topic]

does the jornada 720 have the jtag pins avaliable as solder-pads? could we
use it to flash the replacement boards (or do they require +12V to
program)?

jacek

ps. if anyone wants to waste some of his time , read below for other
problems that you might encounter with serial ports

On Thu, 24 Apr 2003, John Ankcorn wrote:

> I have had some problems in the past with terminal emulators
> not sending characters unless DTR (data terminal ready) was high.
[...]
> I doubt that minicom does this, but an easy way to test is to connect
> pins 2 and 3 of the serial port (tx and rx data). Then type a character
> and see if it appears.

if you disable flow control it works in minicom (and is actually a handy
way of checking serial ports).

there are however other problems with serial ports that you might come
across (not neceserily with bootldr):
- break time: if you use hyper terminal a break lasts for almost a second
at 9600baud. minicom has a much shorter break. under linux some
usb-to-serial devices give a very short (unusable) break (at
least pl2303 has this behaviour)
- "packetisation" of serial data in serial-to-usb converter drivers. most
of them queue bytes to send until a threshold or a timeout is reached to
conserve bandwidth on the usb bus. this often is a problem with
communicating with embedded devices
- general weird behaviour of serial-to-usb converters.
Received on Fri Apr 25 08:06:26 2003