Vishal

I am currently working on a Development Board based on RK3288. We are using Rockchip kernel as mentioned here https://github.com/rockchip-linux/kernel This uses libdrm (DRI) for its rendering purposes. But it has limitations. Only one CRTC is connected out of 2. It provides 8 planes, out of which only 4 are available for the working CRTC, out of which user available OVERLAY planes are only 2, and out of which only 1 Plane supports NV12 rendering. I need to show 2-4 videos simultaneously, can anyone help me here on how to procure more planes, particularly NV12 compatible OVERLAY type, that can be connected to the working CRTC?

Thanks for the prompt response, really appreciate it. But the steps mentioned in the above link did not work for me. After installing the said package, I got the following errors on building my test driver ubuntu@localhost:~/vishal/kernel_modules/wow_display_manager$ make make -C /lib/modules/'4.4.71-rockchip'/build/ M=/home/ubuntu/vishal/kernel_modules/wow_display_manager modules make[1]: Entering directory '/usr/src/linux-headers-4.4.71-rockchip' CC [M] /home/ubuntu/vishal/kernel_modules/wow_display_manager/wow-display-manager.o gcc: error: unrecognized command line option ‘-mgeneral-regs-only’ scripts/Makefile.build:264: recipe for target '/home/ubuntu/vishal/kernel_modules/wow_display_manager/wow-display-manager.o' failed make[2]: *** [/home/ubuntu/vishal/kernel_modules/wow_display_manager/wow-display-manager.o] Error 1 Makefile:1419: recipe for target '_module_/home/ubuntu/vishal/kernel_modules/wow_display_manager' failed make[1]: *** [_module_/home/ubuntu/vishal/kernel_modules/wow_display_manager] Error 2 make[1]: Leaving directory '/usr/src/linux-headers-4.4.71-rockchip' Makefile:8: recipe for target 'all' failed make: *** [all] Error 2 ubuntu@localhost:~/vishal/kernel_modules/wow_display_manager$ We have a Rockchip RK3288 based development board with a bare minimum Ubuntu ported on top of the Kernel as mentioned here https://github.com/rockchip-linux/kernel The details of Ubuntu are mentioned here http://opensource.rock-chips.com/wiki_Linux_user_guide Is it possible to generate linux-headers from kernel? They are the prerequisites for building kernel level device drivers. Thanks in advance.

While using ubuntu1604-kernel4.4-VAAPLI.img I took downloaded from the server, I came across the following problem. While trying to develop device drivers for kernel space, I realized we dont have any linux headers in the said system. I have tried looking up for the same at Rockchip's github as well as wiki site, but could not find one. Can anyone point me to the correct linux headers ? I am using RK3288 development board, and current my version using "uname -r" is "4.4.55+"