Re: [Ltib] Question on adding device nodes

[Stuart Hughes]

Hi Ted,

I recall a discussion about /dev/rtc, what's in the device_table.txt 
(10,135) is right I think.  So the best thing is probably to leave that 
and fix the breakage in the driver as you say.

device the merge won't work (easily) as you can only locally make these 
as root.

Your best bet is to put a 'mknod' script into rc.local or similar.   If 
your driver dynamically creates it's devices and populates sys, you can 
do something like that in dist/lfs-5.1/sysconfig/sysconfig.spec (line 
211), except put this into an rc.local (or similar script) in a 
merge/etc/... directory.

Sorry it's a mess, but I hope it helps.

Regards, Stuart

Ted Marshall wrote:
> Partly, it is for my own driver.  I was going to just piggy-back on the 
> existing mechanism.
>
> In addition, I am working with the MPC8313E-RDB BSP from Freescale and 
> discovered that in their release for the rev. C board, they changed the 
> RTC driver from 10,135 to 254,0 but didn't change device_table.txt so 
> /dev/rtc wouldn't work.  I have to now admit that the proper thing to do 
> is to fix the driver, not the device_table.
>
> So I guess the bottom line is to dynamically add new devices instead of 
> adding them to device_table.txt.  Makes sense, though it would be nice 
> to have dev merge in a private device table from the platform directory.
>
> Thanks
>
> ----- Original Message ----- From: "Stuart Hughes" <address@hidden>
> To: "Ted Marshall" <address@hidden>
> Cc: <address@hidden>
> Sent: Thursday, July 30, 2009 10:09 AM
> Subject: Re: [Ltib] Question on adding device nodes
>
>
> > Hi Ted,
> >
> > What do you want to change? the device node values are fixed and 
> > global to all kernels.  You should not need to change this file unless 
> > something is missing.  The idea is this is common to all BSPs.
> >
> > If you have your own driver then you need to dynamically create a node.
> >
> > Regards, Stuart
> >
> > Ted Marshall wrote:
> > > Per http://www.bitshrine.org/autodocs/LtibFaq.html#ref_106, 
> > > ltib/bin/device_table.txt is used by package "dev" to create the 
> > > device nodes in the root fs.  What is the best way to make changes 
> > > which are specific to one build?  It seems unreasonable to have the 
> > > specific kernel package overwrite this "global" file.
> > >
> > > Is there a way to make the dev package read a different file, perhaps 
> > > one in ltib/config/platform?
> > >
> > > Suggestions?
> > >
> > > Thanks,
> > > /Ted Marshall