Loading the OSS modules on the XO

pgf at laptop.org pgf at laptop.org
Wed Aug 13 10:43:40 EDT 2008

shivaprasad wrote:
 > Its OK if I need to have root permissions only once right? I can change the


 > /etc/modules/ once during installation of the activity and need not load the
 > module every time I run the activity. I am new programming on Linux and
 > wasnt sure what to change to make the XO load the oss module on startup. So
 > my plan is if I  know how to make the XO load the  oss modules  I can do
 > this in a script and run the script during installation of the activity so
 > that when I launch the activity I would not need root permission.Could you
 > please tell me how to change /etc/modules to load oss modules on startup?

the file /etc/modules that erik mentioned isn't used on the XO, but
there's a similar mechanism in place.

create a new file /etc/sysconfig/modules, with a name that ends
in ".modules", like "oss.modules".  that file should be an executable
shell script which will load the modules you want.  see the existing
"olpc-1.modules" file in that directory as an example, but probably
all you need is a single "modprobe snd-pcm-oss" command.

this should cause your module to be installed when the XO boots.


 > Thanks
 > Shivaprasad
 > On Wed, Aug 13, 2008 at 6:54 PM, Erik Garrison <erik at laptop.org> wrote:
 > > On Wed, Aug 13, 2008 at 06:16:58PM +0530, shivaprasad javali wrote:
 > > > Hi,
 > > >
 > > >    I am porting a application to the XO. It uses the OSS sound Api's to
 > > > render sound. I found that the oss modules are not loaded on the xo by
 > > > default. I was able to load the oss modules by running modprobe
 > > snd-pcm-oss
 > > > which created the /dev/dsp and other device files required by the oss
 > > > modules and was able to run my application on the XO. But the problem is
 > > > every time I reboot the XO I will have to run the commands and load the
 > > oss
 > > > modules.
 > > >
 > > >    Is there any way I can tell the XO to always load the oss modules?
 > > Even
 > > > if I have a script to run the commands on launching the application these
 > > > commands would require super user privileges which I wont have when I
 > > launch
 > > > the application from the activity bar. Any Ideas?
 > >
 > > Without root access, your activity will have difficulty modifying
 > > /etc/modules to enable autoloading the snd-pcm-oss module at boot.  I am
 > > unsure if there is any way around this issue unless the deployment scope
 > > for your activity is a set of machines on which you have root access.
 > >
 > > Erik
 > >
 > part 2     text/plain                 129
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 paul fox, pgf at laptop.org

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