[LinuxPPS] after a reboot suddenly there's no more pps for serial?!

[Folkert van Heusden]

Ok found it:
- setserial package was updated (debian), without the hardpps patch
- pps0 is sometimes attached to lp0 and sometimes against ttyS1
so using the setserial package for applying the hardpps setting to the
serial port is not the way to go
hopefully Udo finds an udev-trick to make it work

On Mon, Apr 21, 2008 at 08:35:18PM +0200, Folkert van Heusden wrote:
> > > > By loading the modules yourself you give the command "modprobe 8250",
> > > > is that right?
> > > Correct.
> > > 
> > > > And after that you see that lp support is enabled,
> > > 
> > > Well, it seems that the lp support is always there, it is just that no
> > > support comes in for the serial device.
> > > 
> > > belle:/home/folkert# rmmod 8250_pci ; rmmod 8250 ; rmmod serial_core
> > > belle:/home/folkert# find /sys/ -iname \*pps\*
> > > /sys/class/pps
> > > /sys/class/pps/pps0
> > > /sys/devices/pnp0/00:07/pps:pps0
> > > belle:/home/folkert# cat /sys/class/pps/pps0/path
> > > /dev/lp0
> > > belle:/home/folkert# modprobe 8250
> > > belle:/home/folkert# find /sys/ -iname \*pps\*
> > > /sys/class/pps
> > > /sys/class/pps/pps0
> > > /sys/devices/pnp0/00:07/pps:pps0
> > > belle:/home/folkert# cat /sys/class/pps/pps0/path
> > > /dev/lp0
> > 
> > It seems that the PPS device related with the serial device is not
> > created? Did you enable the hardpps flag for the serial port?
> 
> Darn. That indeed was part of the problem.
> 
> But:
> belle:/home/folkert# find /sys/ -iname \*pps\*
> /sys/class/pps
> /sys/class/pps/pps1
> /sys/class/pps/pps0
> /sys/devices/pnp0/00:07/pps:pps0
> /sys/devices/platform/serial8250/pps:pps1
> belle:/home/folkert# cat /sys/class/pps/pps0/path
> /dev/lp0
> belle:/home/folkert# cat /sys/class/pps/pps1/path
> /dev/ttyS0
> 
> But:
> belle:/home/folkert# ls -la /dev/ttyS*
> crw-rw---- 1 root dialout 4, 64 2008-04-18 17:41 /dev/ttyS0
> crw-rw---- 1 root dialout 4, 65 2008-04-21 14:19 /dev/ttyS1
> crw-rw---- 1 root dialout 4, 66 2008-04-18 17:41 /dev/ttyS2
> crw-rw---- 1 root dialout 4, 67 2008-04-18 17:41 /dev/ttyS3
> and:
> belle:/home/folkert# dmesg | grep ttyS
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> 00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> 0000:05:02.0: ttyS1 at I/O 0x8400 (irq = 18) is a 16550A
> 0000:05:02.0: ttyS2 at I/O 0x8800 (irq = 18) is a 16550A
> 
> 
> Folkert van Heusden
> 
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Folkert van Heusden

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