Hello,

On Fri, 22 Aug 2003, Chris Lambert wrote:

Hello, we try to implement drivers for DROPS using the DDE, but we only have the sounddriver described in the diploma thesis of Christian Helmuth. Are there other sample drivers (smaller) available for us to see how to use DDE? It's part of a project at Operating Systems Chair at University of Saarland.

DDE was developed to port existing Linux (hence the name "dde_linux") device drivers to L4(Env) easily. The modular structure should help to port any type of device driver from Linux to L4. You just have to implement a driver class specific library as I've done for OSS sound devices.

We also successfully used DDE to port USB core and USB device drivers as well as to implement a TCP/IP protocol server on L4.

If it is your purpose to write device drivers from scratch I don't think using DDE is the right way because your fixed to Linux's semantics. You may look into DDE's common part (lib/src/*) to learn how things like interrupt or I/O resource requests are done under L4Env. You should also have a look into the following packages: omega0 (interrupt management) and generic_io/l4io (I/O resource and PCI management).

Chao