This is an old revision of the document!
There are two ways to upgrade U-Boot:
You need to follow Build U-Boot documentation to build U-Boot debian package. Then copy the U-Boot debian package to your board and install it.
sudo dpkg -i linux-u-boot-vim4-vendor_xxxx-2019.01_arm64.deb sync sudo reboot
Only for SoC Vendor eMMC U-Boot.
You need to setup Seria Debug Tool first, then you can directly upgrade U-Boot from the console.
The installed U-Boot is located at build/u-boot/fip/_tmp/u-boot.bin.signed
.
u-boot.bin.signed
into an SD card or thumbdrivekvim4# usb_update bootloader u-boot.bin.signed kvim4# reboot