johnty

response my post , also to @ubobrov, I found that node reserved-memory should be outside of SOC, after fixing it , the CMA creating works now. But when installing the sunxi_cedar.ko, it reports "sunxi-cedar 1c0e000.video-engine: syscon failed..." I found the syscon entry is different inside sun8i-h3.dtsi at kernel 5.4.16.

Thanks @ubobrov, tried but did not see dmesg reporting CMA, do you think there is anything conflicted with the built-in Cedrus driver in menuconfig ? my platform is nanopi-duo2 of 512M. --- Media staging drivers │ │ │ │ [*] Allwinner sunXi family Video Devices │ │ │ │ <M> Allwinner Cedrus VPU driver │ │ │ │ *** soc_camera sensor drivers *** Also, may I know the reason cma change from cma@4a000000 to cma@43c00000 at kernel 5.4.

@ubobrov, Thanks for the work on https://github.com/uboborov/sunxi-cedar-mainline it works pretty good on 4.20.17. To install it on mainline Armbian ( 5.4.16+), follow the dts patch, when the kernel module installed, it showed "could not assign reserved memory" in dmesg. This message comes from "of_reserved_mem_device_init" do you have any clue ?