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