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

[tacorner]

Alex,

You are right the ppdev module was not being built.  I had to a 
"make menuconfig" on the kernel and find it under devices/char.  I never did see
it in gconfig, but maybe I didn't scan closely enough.  I compiled it as a
module.   Now avrdude recognizes the parallel port, but I haven't actually
tried to program an ATMega8 yet.  It works in user mode too, so I don't have to
be root.  I will try it out fully soon.

Tom

On 15-Jun-2004 Alexander Stohr wrote:
> 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
>> 
>> 
>> _______________________________________________
>> avrdude-dev mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/avrdude-dev
>> 
> 

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\____ o o ____/ Thomas Corner address@hidden
     )   (     16-Jun-2004 06:55:00  Vienna,  Austria
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