[ltp] RH 7.1, TP21 no /dev/ttySx working

[Friedemann Baitinger]

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is anybody able to use /dev/ttyS{0,1,2} on a T21 with RedHat 7.1? I have
no luck at all. With RH 7.0 and linux-2.2.18 it worked perfectly. Now I
have installed RH 7.1 and have not changed anything in the T21 BIOS (no
tpctl or PS2.EXE used) and the serial module just doesn not work.

Upon loading the driver reports:

May  1 12:53:51 blackbox kernel: Serial driver version 5.05a
(2001-03-20) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled

Here is how the devices are set in the /dev tree:

[root@blackbox baiti]# ll /dev/ttyS{0,1,2}
crw-rw----    1 root     uucp       4,  64 Mar 24 05:38 /dev/ttyS0
crw-rw----    1 root     uucp       4,  65 Mar 24 05:38 /dev/ttyS1
crw-rw----    1 root     uucp       4,  66 Mar 24 05:38 /dev/ttyS2

And here is what minicom achieves when it tries to talk to a US Robotics
modem attached to /dev/ttyS1: (I am copying only the relevant system
calls):

open("/dev/modem", O_RDWR|O_NONBLOCK)   = -1 ENOSYS (Function not implemented)
open("/dev/modem", O_RDWR|O_NONBLOCK)   = -1 ENOSYS (Function not implemented)
open("/dev/modem", O_RDWR|O_NONBLOCK)   = 3

why does open() return -1 twice and then all of a sudden give back a
file descriptor?

fcntl64(3, F_GETFL)                     = 0x802 (flags
O_RDWR|O_NONBLOCK)
fcntl64(3, F_SETFL, O_RDWR)             = 0
ioctl(3, TCGETS, 0xbffff560)            = -1 EIO (Input/output error)
ioctl(3, TIOCMGET, [0])                 = -1 EIO (Input/output error)
ioctl(3, TCGETS, 0xbffff4d0)            = -1 EIO (Input/output error)
ioctl(3, SNDCTL_TMR_START, {B38400 -opost -isig -icanon -echo ...}) = -1
EIO (In
put/output error)
ioctl(3, TIOCMGET, [0])                 = -1 EIO (Input/output error)
ioctl(3, TIOCMSET, [TIOCM_RTS])         = -1 EIO (Input/output error)
ioctl(3, TCGETS, 0xbffff470)            = -1 EIO (Input/output error)
ioctl(3, SNDCTL_TMR_START, {B1000000 -opost isig -icanon echo ...}) = -1 EIO (In
put/output error)

Oh BTW: /dev/modem is a symlink to /dev/ttyS1


Any ideas? The problem occurs with the standard kernel that came with RH
7.1 and it also occurs with my own-built linux-2.4.4

- -- 
Friedemann Baitinger      fb@baiti.net       http://baiti.net/fb/
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