I quite agree with Ben and Christian. I think UIO drivers are usable for simple devices, I think they aren't mature (will it ever be?) to use it with complicated devices or with strict requirement. Regards, Douglas, Jim (Jim) ha scritto: > We are contemplating porting a large number of device drivers to Linux. > The pragmatic solution is to keep them in user mode (using the UIO > framework) where possible ... they are written in C++ for a start. > > The obvious disadvantages of user mode device drivers are security / > isolation. The main benefit is ease of development. > > Do you know what the *technical* disadvantages of this approach might > be? I am most concerned about possible impact on interrupt handling. > > For example, I assume the context switching overhead is higher, and that > interrupt latency is more difficult to predict? > > --jim douglas > Avaya UK, Registered in England and Wales under Registered Number > 3049861, Registered Address: Avaya House, Cathedral Hill, Guildford, > Surrey, GU2 7YL. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-embedded" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Marco Stornelli Embedded Software Engineer CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni http://www.coritel.it marco.stornelli@xxxxxxxxxx +39 06 72582838 -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
