parport problems with devfs

parport problems with devfs

[Nico Schottelius]

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Hello!

I attached the problem occured with parport and devfs.
I don't exactly know where the problem in the parport source
is. If someone has a patch for it, I will test it.

Nico


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# Loading the parport and parport_pc modules for my parallelport
flapp:/home/user/nico/gpm-1.19.3 # modprobe parport_pc

# is there an entry in /dev ?
flapp:/home/user/nico/gpm-1.19.3 # ls /dev/
.         cdroms   fb      initctl  mem   ptmx    root     usb
..        console  full    input    misc  pts     shm      vc
.devfsd   cpu      gpmctl  kmem     null  pty     tty      vcc
apm_bios  discs    ide     log      port  random  urandom  zero

# What does the kernel message say ?
flapp:/home/user/nico/gpm-1.19.3 # dmesg  | tail -n 14
usb.c: registered new driver hid
mice: PS/2 mouse device common for all mice
0x378: FIFO is 16 bytes
0x378: writeIntrThreshold is 7
0x378: readIntrThreshold is 7
0x378: PWord is 8 bits
0x378: Interrupts are ISA-Pulses
0x378: ECP port cfgA=0x10 cfgB=0x49
0x378: ECP settings irq=7 dma=1
parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,COMPAT,ECP]
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)


# Have a look what lp0 has been before
>From /usr/src/linux/Documentation/ :
  6 char        Parallel printer devices
                  0 = /dev/lp0          Parallel printer on parport0
                  1 = /dev/lp1          Parallel printer on parport1

# make our own device out of /dev
flapp:/ # mknod /lp0 c 6 0

# has anything happened ? No! 
flapp:/ # ls /dev/
.         cdroms   fb      initctl  mem   ptmx    root     usb
..        console  full    input    misc  pts     shm      vc
.devfsd   cpu      gpmctl  kmem     null  pty     tty      vcc
apm_bios  discs    ide     log      port  random  urandom  zero

# Use the printer the easiest way :)
flapp:/ # cat /tmp/* > lp0

# And now... 
flapp:/ # ls /dev/
.         cdroms   fb      initctl  mem   printers  random  urandom  zero
..        console  full    input    misc  ptmx      root    usb
.devfsd   cpu      gpmctl  kmem     null  pts       shm     vc
apm_bios  discs    ide     log      port  pty       tty     vcc

# there is now the entry printers/0.

Re: parport problems with devfs

[Philip Blundell]

>I attached the problem occured with parport and devfs.
>I don't exactly know where the problem in the parport source
>is. If someone has a patch for it, I will test it.

I don't think this is a bug.  You need to load the `lp' module.

p.

Re: parport problems with devfs

[Nico Schottelius]

Hmm..seems you are exactly right!

Sorry for that wrong though!

Nico

Philip Blundell wrote:

> >I attached the problem occured with parport and devfs.
> >I don't exactly know where the problem in the parport source
> >is. If someone has a patch for it, I will test it.
>
> I don't think this is a bug.  You need to load the `lp' module.
>
> p.

Re: parport problems with devfs

[Anuradha Ratnaweera]

On Wed, 16 May 2001, Nico Schottelius wrote:

> I attached the problem occured with parport and devfs. I don't exactly
> know where the problem in the parport source is. If someone has a
> patch for it, I will test it.
>
> [...]
> 
> # make our own device out of /dev
> flapp:/ # mknod /lp0 c 6 0
                  ^
You are creating /lp0 and not /dev/lp0.

Anuradha


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