HDMI + LVDS0 mirror Wandboard Solo

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HDMI + LVDS0 mirror Wandboard Solo

Postby Rysler » Sat Nov 05, 2016 3:30 pm


I'm having a real bad time trying to setup HDMI+LVDS0 display mirror in IMX6 Solo.

I have gone through several posts regarding this issue but non of them work.

Here my setup:

1) I'm using Wandboard Solo with a custom carrier board
2) Yocto Dizzy (Linux 3.10.17)
3) I have a 1024x600 LVDS screen connected to LVDS0
4) I have a remove "monitor" 1024x600 on HDMI

This is my configuration on the dtb:

mxcfb1: fb@0 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "hdmi";
interface_pix_fmt = "RGB24";
mode_str ="1280x720M@60";
default_bpp = <24>;
int_clk = <0>;
late_init = <0>;
status = "disabled";

mxcfb2: fb@1 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "ldb";
interface_pix_fmt = "RGB24"; /*TOGO CHANGED INTERFACE TO RGB888*/
default_bpp = <24>; /*TOGO CHANGED TO 24BITS*/
int_clk = <0>;
late_init = <0>;
status = "disabled";


&hdmi_core {
ipu_id = <0>;
disp_id = <0>;
status = "okay";

&ldb {
ipu_id = <0>;
disp_id = <1>;
ext_ref = <1>;
mode = "sin0";
sec_ipu_id = <1>;
sec_disp_id = <1>;
status = "okay";

Here my bootargs:
setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw video=mxcfb0:dev=ldb,LDB-WSVGA,if=RGB888 video=mxcfb1:dev=hdmi,1280x720M@60,if=RGB24

Now this is my situation:
I have a total of 6 boards, 3 of them perform the mirror perfectly using the configurations above, the other 3 just show LVDS0 and HDMI is OFF.
I know HDMI is working because when I enter to uboot I can see the "Wandboard" logo on the HDMI monitor.
I have swapped boards and so on and the failure always follows the "cpu", for instance if I take the sdcard from a "good" CPU and place it in a "bad" CPU the issue is still on the bad CPU. If I swap carriers between a bad CPU and a good CPU then again the failure follows the CPU.

Could it be possible that the "bad" CPUs are somehow damaged? But could it be that only the screen mirror is damaged? All other functions of the board are working 100%

I would really appreciate any input you might have, this issue is driving really me crazy.

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Joined: Mon Jun 29, 2015 11:48 am

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