I've been trying to load my kernel without constantly updating the SD card, so far to no avail:
- I connected my RPi to my computer using a USB/TTL cable. Using the Raspbootin Java client from https://github.com/milanvidakovic/Raspbootin64Client and opening a terminal, I was able to catch the UART traffic that my kernel is sending. To it seems like my USB/TTL cable is properly configured
- Trying to upload my kernel however doesn't work. I booted the RPi running the Raspbootin64 kernel receiver from https://github.com/bztsrc/raspi3-tutori ... spbootin64 and tried to upload my kernel8.img file, but most of the time it says "Connecting to the Raspbootin..." without going any further. One time it was able to upload the file ("Got the response from Raspbootin64: OK. Sent 48780 bytes." then a bunch of weird characters), but nothing was displayed on the RPi screen.
- I tried the option of booting off a USB stick. I set the USB booting mode in the config.txt on the SD card. I can then start a Raspbian distro installed on a USB stick, but putting my own kernel8.img on the USB stick (hiding the original kernel.img) only produces a blank screen