Kimchi Boot Files

This repository contains files used for booting the Kimχ Micro SBC and supported addon boards.

System Requirements

If you'd like to build the binaries for booting the board, you'll need a couple host tools. U-boot tools compile the boot scripts, and a device tree compiler for the device tree overlays.

Debian or Ubuntu:

sudo apt install u-boot-tools device-tree-compiler

MacOS:

brew install u-boot-tools dtc

Building

Simply run:

make

Deploying to Target for Testing

Network (Ethernet or WiFi from Linux)

The boot files are (by default) located on a FAT partition on EMMC. If you have a network connection, you can do the following

ssh root@kimchi mount /dev/mmcblk0p1 /boot
scp -r output/* root@kimchi:/boot/

USB

The files can be loaded with uuu and fastboot running on u-boot through the USB-C port. First you need to get u-boot into fastboot mode.

• Starting fastboot via UART

  If you have a serial connection, you can press Ctrl-C while u-boot is loading to interrupt the normal boot process and then run:

  fastboot usb 0
  

• Starting fastboot via USB

  You may use uuu to download and start u-boot from memory. This will automatically put u-boot in fastboot mode after starting. You'll need a copy of the u-boot image, which may be built from source or found in the Yocto deploy directory. Run the following:

  sudo uuu -b spl imx-boot
  

Now that the board is running fastboot (you'll see a blue LED lit), you can download the boot files to EMMC:

cd output
sudo uuu -v -b fat_write * mmc 0:1

To boot the board after downloading, the following can be run. Note that this command will timeout as control does not return to fastboot for a reply:

sudo uuu FB: ucmd boot