U-boot prompt not visible

General Discussions
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1

Hello,

I am currently having an issue where if I change the config.txt to enable certain overlays, u-boot prompt is not visible anymore.

I am using raspberrypi-cm3 with yocto warrior branch. I created two raspberry-pi images using this link
https://hub.mender.io/t/raspberry-pi-3-model-b-b/57/28

  1. one image with my config.txt changes(u-boot prompt not visible)
  2. one image with no changes (u-boot prompt visible)
   framebuffer_height=600
    framebuffer_width=1024
    display_rotate=0
    #dtoverlay=vc4-kms-v3d
    dtoverlay=dpi24 
    hdmi_ignore_edid=0xa5000080
    enable_dpi_lcd=1
    dtoverlay=pwm,pin=40
    dtoverlay=i2c-rtc-gpio,pcf8523,i2c_gpio_sda=44,i2c_gpio_scl=45,i2c_gpio_delay_us=2
    display_default_lcd=1
    dpi_group=2
    dpi_mode=87
    dpi_output_format=0x6f007
    hdmi_timings=1024 0 60 4 60 600 0 10 4 10 0 0 0 60 0 43000000 5

I had to make changes to my config.txt mainly to accommodate my display screen. It is connected to the DPI pins

How do I change u-boot configuration to allow my LVDS display settings?
I think that is the reason why u-boot prompt is not getting displayed
Edit 1: Added new information

2

This you probably need to do in the U-Boot sources in either the header configuration file (rpi.h), board file (rpi.c) or maybe even in the device tree in the U-Boot for the RPi.