Re: [avrdude-dev] /dev/parport0 not recognized

[Alexander Stohr]

in theory, "ppdev" module should autoload when /dev/parport0 is opened.
in practice the low-level access trough that device is so rarely used that it
might not be created in your distribution.

for better understanding read the parport docu in the linux kernel sources.

in short, parport is a generic server, which gets parport_pc and other driver
modules plugged in that do serve as the true hardware port driver.
then driver modules, as for the "lp" device node and the "parport" device node
will get launched on top of the parport module to service misc requests,
like generic line-printer support or ecp (enhanced communications port)
or, as in this case for the avrdude program and its misc programmer hardware.

-Alex.

----- Original Message ----- 
From: "Theodore A. Roth" <address@hidden>
To: <address@hidden>
Cc: <address@hidden>
Sent: Wednesday, June 16, 2004 12:46 AM
Subject: Re: [avrdude-dev] /dev/parport0 not recognized


> On Wed, 16 Jun 2004 address@hidden wrote:
> 
> > I am running avrdude on Slackware 9.1 Linux with kernel 2.6.6.  I get the
> > following response:
> > ----------------------------------------------------------------------
> > inx# avrdude -p m8 -c dt006
> > avrdude: can't open device "/dev/parport0": No such device or address
> > avrdude: failed to open parallel port "/dev/parport0"
> 
> Does /dev/parport0 exist?
> 
> Here's what is looks like on my debian system
> 
>   $ ls -l /dev/parport0
>   crw-rw-rw-    1 root     root      99,   0 Oct 22  2002 /dev/parport0
>   $ uname -a
>   Linux knuth 2.6.6-1-686 #1 Wed May 12 14:57:57 EST 2004 i686 GNU/Linux
> 
> Do you have the parport module installed?
> 
>   $ lsmod | grep par
>   parport_pc             35008  1
>   parport                41832  2 lp,parport_pc
> 
> 
> > ----------------------------------------------------------------------
> > I am running as root and have no trouble programming an ATMega8 with
> > ponyprog2000 for linux.  I get the same response with version 4.3.0 and the
> > current cvs.
> 
> Does ponyprog use the parport driver or does it use direct IO access to
> the parallel port? Does ponyprog work if you are not root? You really
> should not need to be root to run avrdude.
> 
> >
> > Trying /dev/lp0 yields the following:
> > ----------------------------------------------------------------------
> > inx# avrdude -P /dev/lp0 -p m8 -c dt006
> > avrdude: can't claim device "/dev/lp0": Invalid argument
> > ----------------------------------------------------------------------
> 
> I don't think that /dev/lp0 will work since we are not using direct IO
> access with avrdude.
> 
> 
> ---
> Ted Roth
> PGP Key ID: 0x18F846E9
> Jabber ID: address@hidden
> 
> 
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