This is an old revision of the document!
This documentation will introduce how to upgrade U-Boot.
Follow documentation to Build U-Boot.
There are two ways to upgrade U-Boot:
Copy the U-Boot debian package to your board and install it directly.
$ 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 follow the steps bellow to upgrade the U-Boot:
SPACE
key to enter the U-Boot command lineu-boot.bin.signed
into an SD card or thumbdrive which is located at build/u-boot/fip/_tmp/u-boot.bin.signed
kvim4# usb_update bootloader u-boot.bin.signed kvim4# reboot