Re: [Ltib] Request to explain how the platform specific drivers can be loaded into the rootfs

[Stuart Hughes]

Hi Malay,

Please keep messages on the list.

Use the example hello_mod as a template to write your driver.  This will
end up on your target image and you'll be able to insmod it.  Before you
change it, try it out as a pure "hello world" to get familiar.  There is
a README in the source for this (rpm/BUILD/hello_mod-1.2/README) that
should help.

To create a device node, just use mknod, or you can alternatively add
and entry to bin/device_table.txt and when you re-build the device node
will be on the target.  Note this is only true for static device nodes.

Regards, Stuart


malay jajodia wrote:
> Hi Stuart,
> 
> Thanks a lot for your quick reply.
> 
> My doubt is that i want to write a simple device driver (say blinking
> LED on my PHYTEC3250 board). Since it is a platform specific driver, i
> want to know how can i make my driver module available after booting the
> board with Linux image using LTIB, so that i can use insmod on terminal
> "PHY3250>" and use it.  Also how a char device driver node can be created.
> I hope this understand my difficulty.
> 
> On Thu, Aug 12, 2010 at 11:57 AM, Stuart Hughes <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     Hi Malay,
> 
>     Not sure what the real question is here, but there are example kernel
>     module and userspace examples.
> 
>     For userspace try this:
> 
>     ##### unpack the code to rpm/BUILD/helloworld-1.1
>     $ ./ltib -p helloworld -m prep
> 
>     ##### build and install it (to test)
>     $ ./ltib -p helloworld
> 
>     ##### edit the source, make it do what you want
> 
>     ##### re-build and install (repeat this and last step until done)
>     $ ./ltib -p helloworld
> 
> 
>     Similar idea for the kernel module:
>     $ ./ltib -p hello_mod -m prep
>     $ ./ltib -p hello_mod
> 
>     Regards, Stuart
> 
> 
>     malay1 jajodia wrote:
>     > Hi,
>     >
>     > I have started using LTIB for my PHY3250 board and have a question
>     that
>     > has probably been answered many times but still gives me some
>     doubts. If
>     > possible please let me know the steps required to load a platform
>     > specific driver into rootfs. Also i need to make an application
>     program
>     > to test with my driver. I have read many related documents but still i
>     > am confused on how i can achieve both tasks, so please elaborate
>     it with
>     > your reply.
>     >
>     > Thanks a lot in advance.
>     >
>     > --
>     > Malay Jajodia
>     > Email: address@hidden <mailto:address@hidden>
>     <mailto:address@hidden <mailto:address@hidden>>
> 
> 
> 
> 
> -- 
> Malay Jajodia
> Contact No: 618-303-4805
> Email: address@hidden <mailto:address@hidden>