I'm trying to do something with a Raspberry Pi 4
I'm quite a beginner in programming but I am aware of the difficulties I'm going to have to learn something.
The final goal is far, for now I just want to learn some basics.
My first step was to build u-boot because I tought it was useful for loading kernel images through serial TTL cable.
Then I discovered:
that seems to be a better choice for me.
I think my first step into this world should be to follow this:
but this is for Rpi3 and here I already have some difficulties.
What I have tried for now is:
✔ Boot u-boot with output on screen and serial (TTL cable to windows PC with putty). I put the kernel8.img of u-boot directly on the SD card.
✘ Boot u-boot chainloading it via usbimager and the SD card with the image of imgrecv (I am stuck at rainbow screen)
✘ Boot the https://github.com/bztsrc/raspi3-tutori ... areminimum chainloading it (I am stuck at rainbow screen)
In all of the tests I had the SD card FAT formatted with those files inside:
Now I'm a little stuck as I don't know how to proceed the troubleshoting or what to try more
Code: Select all
# Set sdtv mode to PAL (as used in Europe) sdtv_mode=2 # Force the monitor to HDMI mode so that sound will be sent over HDMI cable hdmi_drive=2 # Set monitor mode to DMT hdmi_group=2 # Set monitor resolution hdmi_mode=82 # Make display smaller to stop text spilling off the screen disable_overscan=0 overscan_left=256 overscan_right=0 overscan_top=64 overscan_bottom=0 #U-Boot enable_uart=1 arm_64bit=1 #CSI start_x=1