We have a built a custom board with an LCD interface to drive a 1024 x 768 pixel LVDS panel, 16BPP. It works great on the Beaglebone White with the old Angstrom 3.2 using the board file configuration.
We want to use the Beaglebone Black so we built up a system from http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#2014-07-22 . I added a dts using the same parameters from the old board file but the graphics are blurred and corrupted. The card I made boots on the White also and gives the same results as on the Black. See images below.
I’ve fiddled with the panel timings but they don’t seem to have any effect.
Does anyone have any idea what is wrong and how do I fix it?
Regards,
James
This is part of the (good) image from the frame buffer.
This is a photo of the output on the screen, showing a similar area.
The following is the panel section of the dts file, based on an LCD4 dts:-
/* Settings for AUO G121XN01 / mita cape: */
panel {
compatible = “tilcdc,panel”;
pinctrl-names = “default”;
pinctrl-0 = <&bone_mita_cape_lcd_pins>;
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <16>;
fdd = <0x80>;
tft-alt-mode = <0>;
stn-565-mode = <0>;
mono-8bit-mode = <0>;
sync-edge = <0>;
sync-ctrl = <1>;
raster-order = <0>;
fifo-th = <0>;
invert-pxl-clk = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 1024x768 {
hactive = <1024>;
vactive = <768>;
hback-porch = <80>;
hfront-porch = <48>;
hsync-len = <32>;
vback-porch = <15>;
vfront-porch = <3>;
vsync-len = <4>;
clock-frequency = <56000000>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};
fb {
compatible = “ti,am33xx-tilcdc”;
reg = <0x4830e000 0x1000>;
interrupt-parent = <&intc>;
interrupts = <36>;
ti,hwmods = “lcdc”;
ti,power-gpio = <&gpio1 2 0x0>;
ti,allow-non-reduced-blanking-modes;
};