Mainline U-Boot with SPI, NVMe and SATA boot support

[sigmaris]

I'm running into the same problem. How do I remove usb start from the preboot env variable? Booting timeout is on 0 so I don't have the chance to mash any keys.

If I'm not mistaken, even with a timeout of 0 - there is a narrow window to stop the automatic boot process. Just had to mash keys in the UART console right as you turn your SBC on. At least that's how I was able to muck around in the uboot console.

I read that you could use escape in UART yes, I was hoping that I could do it through the videoconsole too. Time to bust out the CP2102 then

If you do have "usb start" in the preboot env variable, the USB system will be init'ed when U-Boot starts. So then after you see messages about USB starting, you can hit Ctrl-C on the USB keyboard repeatedly until you've cancelled all the attempts to boot from MMC, network and so on, and you should hopefully arrive at the U-Boot prompt, allowing keyboard interaction.