[uClinux-dev] Kernel modules don't work on read-only filesystems ?

[Marty Leisner]

Josue de Freitas <josue.freitas at gmail.com> writes  on Thu, 11 Oct 2007 10:39:15
 -0300
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     > On 10/10/07, Marty Leisner <leisner at rochester.rr.com> wrote:
     > >
     > >
     > > What does /proc/devices say?
     > 
     > 
     > 
     >  # cat /proc/devices
     > Character devices:
     >   1 mem
     >   2 pty
     >   3 ttyp
     >   4 vc/0
     >   5 console
     >   7 vcs
     >  10 misc
     >  90 mtd
     > 162 raw
     > 
     > Block devices:
     >   1 ramdisk
     >  31 mtdblock
     > 
     > 
     > It's the same even if the module is loaded.
     > 
     > Which version of the book are you using?  LDD v3  only covers 2.6...
     > 
     > 
     > 
     > I'm using LDD v2 for the 2.4 kernel.
     > 
     > Did you have it working on other systems...?
     > 
     > 
     > 
     > not yet. but I'm considering to do it on my machine (although, 
theorically,
     > the examples from the book are supposed to work well on PC's)
     > 
     > 
     > marty
     > >
     > 
     > 
     > Thanks, Marty.
     > 
     > Regards, Josue.
    
The fact the devices aren't registering into /proc/devices indicates something is
wrong -- without a device just making  device file won't accomplish anything.

I recall the LDD2 examples worked on early 2.4 kernels, not later ones.

Caveat emporer...working through the LDD2 examples about 4 years I found painful...
(the kernel is always a moving target)

marty