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List:       linux-arm
Subject:    Re: Second Serial port at IDP PXA
From:       Jeff Sutherland <jeffs () accelent ! com>
Date:       2002-12-17 16:44:13
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On Tuesday 17 December 2002 10:09 am, André Stierenberg wrote:
> Hello,
>
> I´ve have some problems with a serial port of the Accelent IDP for PXA.
> I have connected a barcode scanner to the first serial port and
> everything works fine. But I need to use the barcode scanner with the
> second port. But if I use the second port nothing happens. I have looked
> in the kernel messages which are streamed over serial port one and all
> three serials prots (ttyS0, ttyS1 and ttyS3) is initialized and
> installed. But nothing happens on the second port.
>
> Then I have configured the kernel in the menuconfig, so that the kernel
> messages will be streamed to the second port. But no messages is coming
> over the second port. So I think there must be a problem with the second
> port. There is no getty - process at ttyS1, so this can´t be the reason.
> There is only an entry for tty1 in the inittab, but if I erase this
> entry the system doesn´t start.
>
> What could it be with the second port? And how can I fix it?
>
> Andre

Make sure that jumpers J18, J19, J21, J22 are positioned properly.  These four 
are behind and to the right of J16 (the second serial connector).  The 4 
shunts should be positioned on the left and center pins (towards the 
connector).  Otherwise the Bluetooth radio is selected.  Then just open and 
use /dev/ttyS1.  J46 (to the right of the pcmcia sockets) is on ttyS2.  J47 
and J48's shunts should be positioned to the left to enable serial operation 
as well (or to the right for IrDA).

tty1 is the dev entry for the lcd and must always be present.

Be aware that ttyS0 is the only port with full handshaking.  ttyS1 has RTS/CTS 
only, and ttyS2 is strictly txd/rxd only.  Your scanner may be wanting to see 
DTR or something like that.
- -- 
  Jeff Sutherland, Accelent Systems, Inc.   <http://www.accelent.com>
  -  +  -  +  -  +  -  +  -  +  -  +  -  +  -  +  -  +  -  +  -  +  -  
Kodachrome: After nearly 70 years there's still no better way to
preserve an image.
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