I have a PicoZed board and am having difficulty getting /dev/fb0 to come alive.
I know my hardware is completely functional because when I mmap() the hardware via /dev/mem, I am able to start up the video and get the TPG to create video test patterns on the display.
Yet, I can't get the system to create /dev/fb0.
Here is what my devtree looks like..
..
video_videoDMA: dma@43000000 {
#dma-cells = <1>;
compatible = "xlnx,axi-vdma-1.00.a";
interrupt-parent = <&intc>;
interrupts = <0 29 4 0 34 4>;
reg = <0x43000000 0x10000>;
xlnx,flush-fsync = <0x1>;
xlnx,num-fstores = <0x3>;
dma-channel@43000000 {
compatible = "xlnx,axi-vdma-mm2s-channel";
interrupts = <0 29 4>;
xlnx,datawidth = <0x18>;
xlnx,device-id = <0x0>;
xlnx,genlock-mode ;
xlnx,include-dre ;
};
dma-channel@43000030 {
compatible = "xlnx,axi-vdma-s2mm-channel";
interrupts = <0 34 4>;
xlnx,datawidth = <0x18>;
xlnx,device-id = <0x0>;
xlnx,genlock-mode ;
xlnx,include-dre ;
};
};
...
vcap_tpg {
compatible = "xlnx,video";
dmas = <&video_videoDMA 1>;
dma-names = "port0";
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
direction = "output";
vcap_tpg_in: endpoint {
remote-endpoint = <&tpg_out>;
};
};
};
};
Everything seems to be working because /dev/video0 get plumbed up.
root@petalinux:/# ls -l /dev/video0
crw-rw---- 1 root root 81, 0 Jan 1 00:00 /dev/video0
Also, the VDMA, TPG, and VTC print the following messages on the console.
xilinx-vdma 43000000.dma: Xilinx AXI VDMA Engine Driver Probed!!
xilinx-video amba_pl:vcap_tpg: device registered
xilinx-vtc 43c10000.v_tc: device found, version 6.010
Any advice or help on how to get the /dev/fb0 device to come alive is most appreciated!
-brad w.