[ltp] serial port won't work as terminal to connect to other devices

[Paul Timmins]

Most newer thinkpads ship with the serial port disabled in the BIOS for
some stupid reason. Either way, Windows 2000 enables it during the boot
process, and linux doesn't. Go into your BIOS setup and confirm that the
serial port is enabled. Enabling it shows no ill effect in Windows 2000
and causes it to function properly in Linux as well.
-Paul

On Tue, 2002-12-10 at 16:22, S Y Medley wrote:
> 
> That's not it, i'm afraid.  I already did the setup on the port. 
> I think there's something more fundamental that's wrong.
> If i do a cat>/dev/ttyS0 or a cat /dev/ttyS0, i get an I/O error.  Seems like the Linux kernel is not aware that there's a port?  Or it's turned off?  It seems to have the right IRQ (4) and the right port number (0x03f8), but it's still not working...
> Susannah
>  
>  Tom <tom.hornberger@verizon.net> wrote:Just run minicom. CTRL-A Z will bring up the setup menu. Select "O" 
> (cOnfigure) and set your serial port up. It should work.
> 
> HTH,
> Tom
> 
> On Monday 09 December 2002 22:24, S Y Medley wrote:
> > Please help, if you can.
> >
> > I've got a Thinkpad set up as a dual boot (Windows
> > 2000 and RedHat Linux 6.2).
> >
> > In Windows, the COM1 works fine with settings 9600N8.
> >
> > I've been trying for days to get minicom set up to
> > work as a terminal on that same serial port. I'm
> > stumped.
> >
> > Examples of things i've tried:
> >
> > wyvern / # cat > /dev/ttyS0
> > cat: write error: Input/output error
> > wyvern / # cat > /dev/ttyS1
> > cat: write error: Input/output error
> > wyvern / # cat > /dev/ttyS2
> > cat: write error: Input/output error
> >
> > wyvern /dev # setserial /dev/ttyS0 autoconfig
> > wyvern /dev # setserial -a /dev/ttyS0
> > /dev/ttyS0, Line 0, UART: unknown, Port: 0x03f8, IRQ:
> > 4
> > Baud_base: 115200, close_delay: 50, divisor: 0
> > closing_wait: 3000, closing_wait2: infinte
> > Flags: spd_normal skip_test
> >
> >
> > O_wyvern:/proc$ cat /proc/tty/driver/serial
> > serinfo:1.0 driver:4.27
> > 0: uart:unknown port:3F8 irq:4
> > 1: uart:unknown port:2F8 irq:3
> > 2: uart:unknown port:3E8 irq:4
> > 3: uart:unknown port:2E8 irq:3
> > 4: uart:unknown port:1A0 irq:9
> > ....
> >
> > wyvern / # ll /dev/ttyS*
> > crw-rw-rw- 1 root tty 4, 64 May 5
> > 1998 /dev/ttyS0
> > crw------- 1 root tty 4, 65 May 5
> > 1998 /dev/ttyS1
> > crw------- 1 root tty 4, 66 May 5
> > 1998 /dev/ttyS2
> > crw------- 1 root tty 4, 67 May 5
> > 1998 /dev/ttyS3
> >
> > wyvern / # cp junk.txt /dev/ttyS0
> > cp junk.txt /dev/ttyS0
> > cp: /dev/ttyS0: Input/output error
> >
> > I think the hardware and BIOS setup must all be good
> > because it works fine with Windows. There's something
> > i'm missing on the Linux side....
> >
> > Thanks,
> > Susannah
> >
> >
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