We have a couple of different systems that we offer. Each has a different display.
One of the displays is split-mode, dual channel LVDS.
The other display is single-channel LVDS.
Both systems have the same kernel. Each has a different DTB (just because of the display).
I would like to have one kernel and one DTB that would run on either system but I'm having trouble wrapping my brain around how to accomplish this.
I use one device tree source file and I just comment out the display that I don't want for each DTB.
My display declaration looks like this.....
&ldb {
status = "okay";
/* AUO */
split-mode = <1>;
status = "okay";
lvds-channel@0 {
crtc = "ipu1-di1";
fsl,data-mapping = "spwg";
fsl,data-width = <24>;
status = "okay";
primary;
display-timings {
t_lvds: t_lvds_default {
clock-frequency = <107991360>;
hactive = <1280>;
vactive = <1024>;
hback-porch = <102>;
hfront-porch = <100>;
vback-porch = <20>;
vfront-porch = <20>;
hsync-len = <2>;
vsync-len = <2>;
};
};
};
lvds-channel@1 {
crtc = "ipu1-di0";
fsl,data-mapping = "spwg";
fsl,data-width = <24>;
status = "okay";
split-mode;
display-timings {
};
};
/* Kyocera
lvds-channel@0 {
fsl,data-mapping = "spwg";
fsl,data-width = <18>;
status = "okay";
primary;
display-timings {
native-mode = <&timing0>;
timing0: hsd100pxn1 {
clock-frequency = <78939059>;
hactive = <1280>;
vactive = <800>;
hback-porch = <80>;
hfront-porch = <80>;
vback-porch = <11>;
vfront-porch = <12>;
hsync-len = <2>;
vsync-len = <2>;
};
};
};*/
};
As i said, I currently just comment out the display that's not being used when I generate my DTB file.
Can anybody offer guidance on how I can break this up into two different declarations?
I plan to have U-Boot detect the current environment and set the kernel variables accordingly before booting.
Any advice or insight would be appreciated!
Thank you.
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Hi Bob
You can find in our BSPs that you can build dtb files for different hardware.
Please check these post: https://community.nxp.com/message/843604?commentID=843604#comment-843604
So, you can take this for reference to create different dtb for different display.
You may need a a way to identify the board you are using. so uboot can know which board is being used, this could be a gpio.
And this is an example how to write a script in u-boot bootargs to load different dtb once you identify which board is being used.
Hope this can help you.
Regards,
Carlos
Hi Bob
You can find in our BSPs that you can build dtb files for different hardware.
Please check these post: https://community.nxp.com/message/843604?commentID=843604#comment-843604
So, you can take this for reference to create different dtb for different display.
You may need a a way to identify the board you are using. so uboot can know which board is being used, this could be a gpio.
And this is an example how to write a script in u-boot bootargs to load different dtb once you identify which board is being used.
Hope this can help you.
Regards,
Carlos
Thanks Carlos.
I had the plan to have two separate FDTs in my back pocket. Was hoping to move forward with one FDT but I can't see how that could be done.
Thanks again. I'm moving forward with two FDTs.