Hello,
I would like to use the barebox framebuffer on a iMX6S chip. My goal
is to display a splashscreen. However, I can't manage to use the
framebuffer for now...
Here is the output of "devinfo fb0":
Resources:
num: 0
start: 0x00000000
size: 0x00000000
Available modes:
Parameters:
enable: 0
mode_name: invalid:0
shadowfb: 1
Is this a correct behavior that there is NO availables modes? I do not
manage to add one through the DTS.
If I try to enable the framebuffer (fb0.enable=1), barebox hangs:
fb0.enable=1
unable to handle NULL pointer dereference at address 0x0000001d
pc : [<2ff1ab1c>] lr : [<2ff17f41>]
sp : 2ffffa3c ip : 2ff1a3fa fp : 2ffffa78
r10: 20212d0c r9 : 00000000 r8 : 00000000
r7 : 20024210 r6 : f57fffff r5 : 0c000000 r4 : 0000001d
r3 : 2ff1a1e5 r2 : 0c000000 r1 : 0000005c r0 : 00000022
Flags: nzcv IRQs off FIQs off Mode SVC_32
[<2ff1ab1c>] (clk_is_enabled+0x34/0x38) from [<7f8d1fc0>] (0x7f8d1fc0)
[<2ff389d9>] (unwind_backtrace+0x1/0x58) from [<2ff00d19>] (panic+0x1d/0x34)
[<2ff00d19>] (panic+0x1d/0x34) from [<2ff38e7d>] (do_exception+0xd/0x10)
[<2ff38e7d>] (do_exception+0xd/0x10) from [<2ff38edd>] (do_data_abort+0x21/0x2c)
[<2ff38edd>] (do_data_abort+0x21/0x2c) from [<2ff38bd4>] (do_abort_6+0x48/0x54)
Switch to console [serial0]
Here is what I put in the DTS to enable the display:
display0: display@di0 {
compatible = "fsl,imx-parallel-display";
// crtcs = <&ipu1 0>;
interface-pix-fmt = "rgb24";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ipu_disp>;
status = "okay";
display-timings {
rk043fn07h {
native-mode;
clock-frequency = <9000000 15000000>;
hactive = <480>;
vactive = <272>;
hfront-porch = <2 2 82>;
hback-porch = <2 2 41>;
hsync-len = <2 41 41>;
vback-porch = <1 2 11>;
vfront-porch = <1 2 227>;
vsync-len = <1 10 11>;
pixelclk-active = <1>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
};
};
port {
display0_in: endpoint {
remote-endpoint = <&ipu1_di0_disp0>;
};
};
&ipu1_di0_disp0 {
remote-endpoint = <&display0_in>;
};
Thank you in advance,
Best regards,
--
Philippe LEDUC
ledphilippe@xxxxxxxxx
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