Official DSi Screen

(In 2015 Chris wrote Evans)

DSI or HDMI not both at present (under RISC OS). The GPU can display on both at the same time, in fact IIRC the Pi can have: DSI, DPI, HDMI, I2C and multiple USB displays all working at the same time! I believe Jeffrey’s long term aim is for RISC OS to support multiple concurrent displays, but currently it is just the one.

Is there any solution to write distinct data on each screen ?
just 2 distinct framebuffer for DSI and HDMI would be wonderfull !

Looking/asking on the raspberrypi.org forum should let you know if the hardware supports it. If yes you then have the minor problem of getting it working under RISC OS!

It seem’s there is no hardware limitation.

https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=203876

Even knowing this, I still do not see how to do that :)
While RiscOs run on HDMI and DSI device, I guess that all the logic to acces to both screen is written in the kernel !

But… I’m not a kernel guru :(