I'm picked up this information at blog.springsource.com. Actually, I'm not able to post a link. Sorry.
The DMK itself requires a minimal set of bundles to run, and is configured with a profile to control exactly the set of additional modules that are loaded. For example, the DMK does not require Tomcat to be present, but the default Platform profile includes Tomcat to allow web applications to be deployed. If you want to run a Platform without Tomcat, you can simply edit the profile and it won't be installed. (If you try this - remember that removing web support means that web modules will no longer deploy, so delete the contents of the pickup directory so the platform won't attempt to install the Admin and splash screen applications when it starts.) The default Platform configuration with the admin console installed takes only 15MB of memory.
In order to switch from the "web" profile to the minimal profile I consult the dm server documentation and other sources. I can't find anything related stuff to this profile configuration.
Is there some information out on the web?