How to add Crash Dumps in Edge V

Hello,

We are using Edge V with Ubuntu 20 fenix ver 1.1.1

BOARD=Edge-V
VENDOR=Rockchip
VERSION=1.1.1
ARCH=arm64
INITRD_ARCH=arm64
INSTALL_TYPE=EMMC_MBR
IMAGE_VERSION=1.1.1-220914

We have a problem that the Edge V reboots unexpectedly from time to time. How can we add crash dumps to help us understand why it happens?