a colleague asks me about the implications of porting a pile of code from a non-linux embedded OS to linux, and simply rewriting most of it as user-space drivers, as opposed to a total rewrite to kernel code. i'm in no way an authority on user-space drivers, so i'm looking for any decent, up-to-date discussions, not so much on the technical aspects, but more the *implications* of doing this. i'm aware of mmap(), and i'm reading up on UIO, and i've found a few online pieces that look informative: http://www.embedded.com/design/operating-systems/4401769/Device-drivers-in-u... http://www.enea.com/Documents/Resources/Whitepapers/Enea-User-Space-Drivers-... so is there something that elaborates on both the pros and cons of doing this? in particular, are there any nice examples of this that can be downloaded, built and played with? thanks muchly. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================