linux-kernel - Re: UIO and Fedora 13 (kernel 33.6)

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Message-ID: <4C7CA7E4.8010005@steinhoff.de>
Date:	Tue, 31 Aug 2010 08:57:40 +0200
From:	Armin Steinhoff <armin@...inhoff.de>
To:	"Hans J. Koch" <hjk@...utronix.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: UIO and Fedora 13  (kernel 33.6)

  Hans J. Koch wrote:
> On Mon, Aug 30, 2010 at 12:49:10PM +0200, Armin Steinhoff wrote:
>>   Hi,
>>
>> I'm writing an UIO driver for a plain PC/104 board (ISA bus).
>> After insmod<my_driver_mod>  I don't see an entry of uio0 in /dev
>> and also no entries in /sys/class. There are no error messages at
>> module load.
> Are you sure your probe() function is called?
   That's the case.

>   After a successfull
> uio_register_device() there is both a /dev/uioX and a directory
> /sys/class/uio/uioX/.
   Seems not be possible after a kernel ooops ...
>> The same happens after loading the module uio.ko and uio_pdrv.ko ...
>> no entries at all, no error messages.
>> uio_pdrv needs platform data set up somewhere, did you do that?
>> See docs in Documentation/DocBook/ for more details.

   uio_pdrv.ko was provided unmodified and precompiles by the Fedora 
distro.
   This example seems more or less incomplete ... it seems also the case 
with the uio_pdrv_genirq example

   However, it seems so I have to go back 2 steps and restart after 
reading  more details of the concept of platform devices ...

   Thanks

   --Armin

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