Boot on USB DRIVE

[Alexandre-Rib]

Hi,

I followed your instructions up to chapter 7. Booting the kernel.

I plugged my bootable usb drive on RPI3, configured with cfdisk, and powered the RPI3.
I have nothing on my display (plugged on rpi3), nether on putty ( configured to Serial with baudrate to 115200. it works on a classical Linux installation on RPI0).

How should RPI3 boot on usb drive, on u-boot ? I see nothing in your instructions.

I hope you still give support on your instructions.

By advance, thank you for your answer

[mhomran]

Hi, the usb booting has nothing to do with what you want to boot e.g. uboot. It has to do with your Raspberry pi. For raspberry pi 3, you'll need the USB boot bit to be set in the OTP (one-time programmable memory) which "I don't recommend" because it will set your rpi to permanently boot from USB only. I have raspberry pi 3 b+ which has the option to boot from USB without having to enable this bit in the OTP memory.
I actually used USB because it was handy and easy, also I have it enabled by default in RPI 3 b+. It's not actually necessary for this tutorial, you can use an sd-card, and it will work fine.

Thank you and happy developing.

[Alexandre-Rib]

Hi,

thank you for your last answer.
Sadly, even with a sd card (16go => 977 Mo for FAT first partition, almost 15 GO for the linux partition), it doesn't work :

I put all this files to the root :

I think there is no error on the config.txt file :
config.txt

About the compiled/generated files, as Image, u-boot and bcm**.dtb , I just followed your instructions, and obviouly I used the cross toolchain the recommended.

I see a nice rainbow on my screen. But absolutelly nothing on Putty :