AM625: Facing issue with 7inch OLDI display with beagleplay

Hi Sumanth,
Seems like you are trying to interface a custom OLDI panel? In that case you will have to manually add timing parameters and configs in panel-simple and create your dt overlay for your custom OLDI using that.

For the error, you may check if there has been any accidental change in the file using git diff. Not sure but, isn't there a make all script that can do this for you? If you are still facing difficulties, would recommend you to reach out Beagle community forums.

Hi Divyansh,
I have used make on /opt/source/dtb-5.10/ to generate dtbo. that error is resolved (it was coming because of some dependencies of cpp preprocessor in dts file). but still display is not up. I dont know how to get debug info from it.

even i dont know what i am doing wrong, because this kernel build and all new to me.

Actually i want to custom build kernel image for my application like OLDI,SSH over USB,and EEPORM etc.. Where can i find a proper resources on how to do it, like what all things to be changed in menuconfig or in dts files. 
If you know any way out please let me know.

thank you

You may use this page: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/latest/exports/docs/devices/AM62X/linux/Overview.html as well as Beagle datasheets and documents. 
This is all mostly generic Linux, so for basic queries, web search can also help.
For OLDI:
Try running commands given at [FAQ] AM62P: Display SubSystem (DSS): Basic Debugging and Forum Best Practices (not sure if all linux utilities have been enabled in your working project) but if they work, please share the command outputs here.